ac Power and diplomacy in the post-liberal cyberspace By feedproxy.google.com Published On :: Thu, 07 May 2020 09:31:03 +0000 7 May 2020 , Volume 96, Number 3 André Barrinha and Thomas Renard Read online It is becoming widely accepted that we have transitioned, or are now transitioning, from an international liberal order to a different reality. Whether that reality is different solely in terms of power dynamics, or also in terms of values and institutions, is up for discussion. The growing body of literature on ‘post-liberalism’ is used as an entry-point for this article, which aims to explore how the post-liberal transition applies to cyberspace. We explore how power dynamics are evolving in cyberspace, as well as how established norms, values and institutions are contested. The article then looks at the emergence of cyber diplomacy as a consequence and response to the post-liberal transition. As it will be argued, if cyberspace was a creation of the liberal order, cyber-diplomacy is a post-liberal world practice. What role it plays in shaping a new order or building bridges between different political visions, and what it means for the future of cyberspace, will constitute key points of discussion. Full Article
ac The Changing Nature of Russia’s Military Strategy and Its Tactical Application By feedproxy.google.com Published On :: Mon, 14 Oct 2019 10:15:01 +0000 Invitation Only Research Event 12 November 2019 - 4:00pm to 5:30pm Chatham House | 10 St James's Square | London | SW1Y 4LE Event participants Oscar Jonsson, Director, Stockholm Free World Forum (Frivärld)Mathieu Boulègue, Research Fellow, Russia and Eurasia Programme, Chatham HouseChair: Alice Billon-Galland, Research Associate, Europe Programme, Chatham House Russia’s military strategy is increasingly blurring the boundaries between war and peace. As the nature of warfare changes, the Kremlin is adapting its strategies to pursue conflict, especially through non-military means - below the threshold of armed violence. Russian military tactics are often mistaken for strategy in the West. Oscar Jonson, author of The Russian Understanding of War, will talk through this debate and explore how the Russian leadership now understands military strategy in the context of modern warfare. Mathieu Boulègue will address the more operational aspects of contemporary warfare for Russia, notably grey zone operations. Department/project Russia and Eurasia Programme Anna Morgan Administrator, Ukraine Forum +44 (0)20 7389 3274 Email Full Article
ac Kazakhstan: Reaching Out to Central Asian Neighbours By feedproxy.google.com Published On :: Wed, 04 Dec 2019 10:21:03 +0000 4 December 2019 Annette Bohr Associate Fellow, Russia and Eurasia Programme Despite its regional outreach, Kazakhstan’s diplomatic priority will remain Russia, China, and Europe. 2019-12-04-Kaz.jpg Kazakhstan's President Kassym-Jomart Tokayev, Kazakh Majilis Chairman Nurlan Nigmatulin and ex-president Nursultan Nazarbayev at an inauguration ceremony in parliament. Photo: Pavel AleksandrovTASS via Getty Images. Leaders of the resource-rich Central Asian region have the propensity to remain in power until mortality dictates otherwise. Much like the UK and Brexit, however, few wanted to see Central Asia’s longest reigning ruler, Kazakhstan’s septuagenarian president Nursultan Nazarbayev, crash out without a deal.The sudden departure of the country’s official leader of the nation with no clear succession plan could have led to investment chaos, intra-elite fighting and the unravelling in a matter of months of a system he had built over decades, à la Uzbekistan following the death of long-serving autocrat Islam Karimov in 2016.In order to avoid just such a ‘no-deal’ scenario and ensure the continuity of his policies, in March Nazarbayev carefully choreographed his own resignation and the election of a hand-picked successor, President Kassym-Jomart Tokayev, while retaining plum positions and powers for himself.Tokayev’s assumption of the presidency was accompanied by protesters in the streets, increasing wealth inequality, rising Sinophobia among rank-and-file Kazakhstanis, a hard-to-kick economic dependence on oil revenues and a lack of clarity as to which leader—the old or the new president—would actually be calling the shots. But, amidst this plethora of concerns, as argued in a recent Chatham House report, Kazakhstan: Tested by Transition, one bright spot has been the tangible growth of intra-Central Asian cooperation, with the Nazarbayev-Tokayev ruling duo appearing eager to improve the regional dialogue.Kazakhstan has long shaped its identity as a Eurasian state that has acted as more of an intermediary between Russia and Central Asia than as an integral part of the Central Asian region. But since 2017, in particular, Kazakhstan has been increasingly looking for opportunities to boost hitherto weak cooperation with its Central Asian neighbours. While this is first and foremost owing to the liberalization of Uzbekistan’s large market, there are other factors at work that get less airplay.One such factor is a perceptible disentangling from the Kremlin’s policy directions as Kazakhstan has come to view Russia’s foreign policy as increasingly neo-colonial. The example of the Russia-led Eurasian Economic Union is in many respects more off-putting than inspiring, and Nur-Sultan does not want to be locked tightly into the union’s economic orbit. And in distancing itself slightly from Moscow in order to limit Russian leverage in its affairs, Nur-Sultan has shown itself to be more open to Central Asian regional initiatives.As part of the leadership’s plan to offset oil dependence, Kazakhstan aspires to become the transport, telecommunications and investment hub for Eurasian integration. The intense focus on connectivity and the development of logistical arteries and infrastructure could have the knock-on effect of boosting trade within the Central Asian region and reducing transit times, which are currently greater than in most other parts of the globe.In addition, demographic trends and educational shifts that favour ethnic Kazakhs, together with a growing ethno-nationalist narrative, have allowed the state’s leadership to identify more closely with Kazakhstan’s common Central Asian heritage and, by extension, a common Central Asian region—although Kazakhstan’s leadership still remains eager to demonstrate that the country is not just another ‘stan’. The coming to power of President Mirziyoyev in Uzbekistan appears to have made Kazakhstan more aware of the interconnectedness of the two countries in terms of geographical location and potential economic complementarities, as well as culture and history.Not least, there is a growing recognition among the Central Asian states themselves—including isolationist Turkmenistan to a degree—that deepening regional trade is mutually beneficial, especially given the constraints associated with Russia’s economic problems. The strengthening of Kazakhstan’s ties with Uzbekistan has slowly kick-started regional cooperation as a whole: trade turnover between the Central Asian states in 2018 grew by 35 per cent on the previous year.But both Kazakhstan and Uzbekistan are keen to stress that there is no discussion of integration or institutionalization, not least because previous attempts at integration have been overtaken by Russia, leaving Central Asia without its own coordinating body.The official consensus in Kazakhstan is that Uzbekistan’s economic reforms after years of isolation will spur ‘a healthy rivalry’ and ultimately boost Kazakhstan’s own economy, in so far as the competition for foreign investment will require both countries to work harder to improve their respective business and regulatory environments.At the unofficial level, however, some Kazakhstani analysts view Uzbekistan’s rise as potentially unprofitable, given the possible diversion of some investments and market activity from Kazakhstan to Uzbekistan. Moreover, Uzbekistan has the advantage of having undergone a clear change of executive, while it remains unclear which developments await Kazakhstan once First President Nazarbayev leaves the scene for good.It can certainly be argued that Uzbekistan does pose a potential threat in the long-term to Kazakhstan’s entrenched position as Central Asia’s economic powerhouse: Uzbekistan’s population is one-and-a-half times bigger, even if its nominal GDP is three times smaller. Uzbekistan has a bigger market and a well-developed industrial sector, and is already the regional leader in terms of security. But it is not as though the world’s interest is moving from Kazakhstan to Uzbekistan; rather, Uzbekistan is in the process of trying to catch up.Despite this relatively upbeat picture, Kazakhstan’s combined trade with the other Central Asian states accounts for less than 5 per cent of its total volume of foreign trade—a figure that cannot begin to equal its trade with Russia, China, and Europe. As a result, Kazakhstan will continue to give greater importance to positioning itself as a global player than as a regional leader.This article was originally published in The Diplomat. Full Article
ac Secrets and Spies: UK Intelligence Accountability After Iraq and Snowden By feedproxy.google.com Published On :: Wed, 15 Jan 2020 09:23:12 +0000 20 January 2020 How can democratic governments hold intelligence and security agencies to account when what they do is largely secret? Jamie Gaskarth explores how intelligence professionals view accountability in the context of 21st century politics. Jamie Gaskarth Senior Lecturer, University of Birmingham Secrets and Spies (cover image) Using the UK as a case study, this book provides the first systematic exploration of how accountability is understood inside the secret world. It is based on new interviews with current and former UK intelligence practitioners, as well as extensive research into the performance and scrutiny of the UK intelligence machinery.The result is the first detailed analysis of how intelligence professionals view their role, what they feel keeps them honest, and how far external overseers impact on their work.The UK gathers material that helps inform global decisions on such issues as nuclear proliferation, terrorism, transnational crime, and breaches of international humanitarian law. On the flip side, the UK was a major contributor to the intelligence failures leading to the Iraq war in 2003, and its agencies were complicit in the widely discredited U.S. practices of torture and 'rendition' of terrorism suspects. UK agencies have come under greater scrutiny since those actions, but it is clear that problems remain.Secrets and Spies is the result of a British Academy funded project (SG151249) on intelligence accountability.Open society is increasingly defended by secret means. For this reason, oversight has never been more important. This book offers a new exploration of the widening world of accountability for UK intelligence, encompassing informal as well as informal mechanisms. It substantiates its claims well, drawing on an impressive range of interviews with senior figures. This excellent book offers both new information and fresh interpretations. It will have a major impact.Richard Aldrich, Professor of International Security, University of Warwick, UKGaskarth’s novel approach, interpreting interviews with senior figures from the intelligence world, brings fresh insight on a significant yet contested topic. He offers an impressively holistic account of intelligence accountability—both formal and informal—and, most interestingly of all, of how those involved understand it. This is essential reading for those wanting to know what accountability means and how it is enacted.Rory Cormac, Professor of International Relations, University of NottinghamAbout the authorJamie Gaskarth is senior lecturer at the University of Birmingham, where he teaches strategy and decision-making. His research looks at the ethical dilemmas of leadership and accountability in intelligence, foreign policy, and defence. He is author/editor or co-editor of six books and served on the Academic Advisory panel for the 2015 UK National Security Strategy and Strategic Defence and Security Review.Available now: Buying optionsInsights: Critical Thinking on International Affairs Department/project Russia and Eurasia Programme Full Article
ac Three Challenges for UK Peacebuilding Policy in the South Caucasus After Brexit By feedproxy.google.com Published On :: Tue, 21 Jan 2020 09:24:44 +0000 21 January 2020 Laurence Broers Associate Fellow, Russia and Eurasia Programme @LaurenceBroers Building on the legacies of a long-term British investment in a peace strategy for the South Caucasus is a realistic and attainable goal. 2020-01-21-NK.jpg A building in Nagorny Karabakh flies the flag of the self-proclaimed republic. 'Abkhazia, South Ossetia and Nagorny Karabakh have evolved into examples of what scholars call "de facto states" that, to differing degrees, control territory, provide governance and exercise internal sovereignty,' writes Laurence Broers. Photo: Getty Images. What does Britain’s departure from the EU mean for the country’s policy towards the South Caucasus, a small region on the periphery of Europe, fractured by conflict? Although Britain is not directly involved in any of the region’s peace processes (except in the case of the Geneva International Discussions on conflicts involving Georgia, as an EU member state), it has been a significant stakeholder in South Caucasian stability since the mid-1990s.Most obviously, Britain has been the single largest foreign investor in Caspian oil and gas. Yet beyond pipelines, Britain also has been a significant investor in long-term civil society-led strategies to build peace in the South Caucasus.Through what was then the Global Conflict Prevention Pool, in the early 2000s the Department for International Development (DfID) pioneered large-scale peacebuilding interventions, such as the Consortium Initiative, addressing Armenian-Azerbaijani conflict, in 2003-09. These built civic networks in the South Caucasus and partnerships with British-based NGOs.This experience left a strong intellectual legacy. British expertise on the South Caucasus, including specific expertise on its conflicts, is highly regarded in the region and across the world.There is also a strong tradition of British scholarship on the Caucasus, and several British universities offer Caucasus-related courses. Through schemes such as the John Smith Fellowship Trust, the Robert Bosch Stiftung Academy Fellowship at Chatham House and Chevening Scholarships, significant numbers of young leaders from the South Caucasus have spent time in British institutions and built effective relationships within them.Three challengesThis niche as a champion of long-term, strategic peacebuilding and repository of area-specific knowledge should not be lost as Britain’s relationship with the EU and regional actors evolves. This can be ensured through awareness of three challenges confronting a post-Brexit Caucasus policy.The first challenge for London is to avoid framing a regional policy in the South Caucasus as an extension of a wider ‘Russia policy’. Deteriorating Russian-British relations in recent years strengthen a tendency to view policies in the European neighbourhood through the traditional prisms of Cold War and Russian-Western rivalries.Yet an overwhelming focus on Russia fails to capture other important aspects of political developments in South Caucasus conflicts. Although often referred to as ‘breakaway’ or ‘occupied’ territories, Abkhazia, South Ossetia and Nagorny Karabakh are not ungoverned spaces. They have evolved into examples of what scholars call ‘de facto states’ that, to differing degrees, control territory, provide governance and exercise internal sovereignty.Few disagree that these entities would not survive without external patronage. But neither does that patronage explain their sustainability on its own. Russia-centricity diminishes Britain’s latitude to engage on the full range of local drivers sustaining these entities, contributing instead to less effective policies predicated on competition and containment.A second and related challenge is to maintain and develop Britain’s position on the issue of engaging populations in these entities. De facto states appear to stand outside of the international rules-based system. Yet in many cases, their civil societies are peopled by skilled and motivated activists who want their leaders to be held accountable according to international rules.Strategies of isolation ignore these voices and contribute instead to fearful and demoralized communities less likely to engage in a transformation of adversarial relationships. Making this case with the wider international community, and facilitating the funding of local civil societies in contested territories, would be important steps in sustaining an effective British policy on the resolution of conflicts. The third challenge for Britain is to maintain a long-term approach to the conflicts of the South Caucasus alongside potential short-term imperatives in other policy fields, as relationships shift post-Brexit.In this fluid international environment, the Foreign and Commonwealth Office has a role to play both as an internal champion of a long-term peacebuilding strategy and a coordinator of British efforts with those of multilateral actors engaged in the South Caucasus. These include the United Nations, the EU’s Special Representative for the South Caucasus and the Crisis in Georgia and OSCE’s Special Representative for the OSCE Chairperson-in-Office for the South Caucasus, all of which have built relationships with relevant actors on the ground.RecommendationsBritain’s niche as a champion and advocate of a strategic approach to peaceful change can be secured post-Brexit in the following ways. First, in-house expertise is crucial to effective peacebuilding programming. The Foreign Office’s research analysts play a vital role in generating independent internal advice and liaising with academic and NGO communities. Their role could be supplemented by the reinstatement of a regional conflict adviser post, based in Tbilisi, tasked with strengthening Britain’s regional presence on conflict issues and coordinating policy at a regional level.This post, with a remit to cover conflicts and build up area knowledge and relationships can contribute significantly to working closely with local civil societies, where so much expertise and knowledge resides, as well as other stakeholders.Second, programming should build in conflict sensitivity by dissociating eligibility from contested political status. This can encourage local populations to take advantage of opportunities for funding, study, comparative learning and professional development irrespective of the status of the entity where they reside.The Chevening Scholarships are an excellent example, whereby applicants can select ‘South Caucasus’ as their affiliated identity from a drop-down menu. This enables citizens from across the region to apply irrespective of the status of the territory in which they live. Finally, a holistic understanding of peace is crucial. Programming in unrecognized or partially-recognized entities should acknowledge that effective peacebuilding needs to embrace political dynamics and processes beyond cross-conflict contact and confidence building. Local actors in such entities may find peacebuilding funding streams defined exclusively in terms of cross-conflict contact more politically risky and ineffective in addressing domestic blockages to peace.While cross-conflict dynamics remain critical, ‘single-community’ programming framed in terms of civic participation, inclusion, civil society capacity-building, minority and human rights in contested territories, and building the confidence from within to engage in constructive dialogue, are no less important.The ’global Britain’ promised by Brexit remains a fanciful idea. Quiet, painstaking work to build on the legacies of a long-term British investment in a peace strategy for the South Caucasus, on the other hand, is a realistic and attainable goal. Full Article
ac Crimea’s Occupation Exemplifies the Threat of Attacks on Cultural Heritage By feedproxy.google.com Published On :: Tue, 04 Feb 2020 14:24:47 +0000 4 February 2020 Kateryna Busol Robert Bosch Stiftung Academy Fellow, Russia and Eurasia Programme @KaterynaBusol LinkedIn Societies, courts and policymakers should have a clearer awareness that assaults against cultural heritage constitute a creeping encroachment on a people’s identity, endangering its very survival. 2020-02-04-Bakhchysarai.jpg 'The destructive reconstruction of the 16th-century Bakhchysarai Palace is being conducted by a team with no experience of cultural sites, in a manner that erodes its authenticity and historical value.' Photo: Getty Images. Violations against cultural property – such as archaeological treasures, artworks, museums or historical sites – can be no less detrimental to the survival of a nation than the physical persecution of its people. These assaults on heritage ensure the hegemony of some nations and distort the imprint of other nations in world history, sometimes to the point of eradication.As contemporary armed conflicts in Syria, Ukraine and Yemen demonstrate, cultural property violations are not only a matter of the colonial past; they continue to be perpetrated, often in new, intricate ways.Understandably, from a moral perspective, it is more often the suffering of persons, rather than any kind of ‘cultural’ destruction, that receives the most attention from humanitarian aid providers, the media or the courts. Indeed, the extent of the damage caused by an assault on cultural property is not always immediately evident, but the result can be a threat to the survival of a people. This is strikingly exemplified by what is currently happening in Crimea.Ukraine’s Crimean peninsula has been occupied by Russia since February 2014, meaning that, under international law, the two states have been involved in an international armed conflict for the last six years.While much attention has been paid to the alleged war crimes perpetrated by the occupying power, reports by international organizations and the International Criminal Court (ICC) have been less vocal on the issue of cultural property in Crimea. Where they do raise it, they tend to confine their findings to the issue of misappropriation.However, as part of its larger policy of the annexation and Russification of the peninsula and its history, Russia has gone far beyond misappropriation.Crimean artefacts have been transferred to Russia – without security justification or Ukrainian authorization as required by the international law of occupation – to be showcased at exhibitions celebrating Russia’s own cultural heritage. In 2016, the Tretyakov Gallery in Moscow staged its record-breaking Aivazovsky exhibition, which included 38 artworks from the Aivazovsky Museum in the Crimean town of Feodosia.Other ‘cultural’ violations in the region include numerous unsanctioned archaeological excavations, whose findings are often unlawfully exported to Russia or end up on the black market.There is also the example of Russia’s plan to establish a museum of Christianity in Ukraine’s UNESCO World Heritage site, the Ancient City of Tauric Chersonese. This is an indication of Russia’s policy of asserting itself as a bastion of Orthodox Christianity and culture in the Slavic world, with Crimea as one of the centres.The harmful effects of Russia’s destructive cultural property policy can be seen in the situation of the Crimean Tatars, Ukraine’s indigenous Muslim people. Already depleted by a Stalin-ordered deportation in 1944 and previously repressed by the Russian Empire, the Crimean Tatars are now facing the destruction of much of the remainder of their heritage.For example, Muslim burial grounds have been demolished to build the Tavrida Highway, which leads to the newly built Kerch Bridge connecting the peninsula to Russia.The destructive reconstruction of the 16th-century Bakhchysarai Palace – the only remaining complete architectural ensemble of the indigenous people, included in the UNESCO World Heritage Tentative List – is another example of how the very identity of the Crimean Tatars is being threatened. This reconstruction is being conducted by a team with no experience of cultural sites, in a manner that erodes its authenticity and historical value – which is precisely as Russia intends.There is a solid body of international and domestic law covering Russia’s treatment of Crimea’s cultural property.Under the 1954 Hague Convention for the Protection of Cultural Property in the Event of Armed Conflict – ratified by both Ukraine and Russia – the occupying power must facilitate the safeguarding efforts of the national authorities in occupied territories. States parties must prevent any vandalism or misappropriation of cultural property, and, according to the first protocol of the convention, the occupying power is required to prevent any export of artefacts from the occupied territory.The 1907 Hague Regulations and the 1949 Fourth Geneva Convention confirm that the authentic domestic legislation continues to apply in occupied territories. This leaves Russia with no excuse for non-compliance with Ukraine’s cultural property laws and imposing its own rules unless absolutely necessary.Besides, both Ukrainian and Russian criminal codes penalise pillage in occupied territory, as well as unsanctioned archaeological excavations. As an occupying power, Russia must not just abstain from such wrongdoings in Crimea, but also duly investigate and prosecute the alleged misconduct.The clarity of the international legal situation demonstrates that no exhibitions in continental Russia and no archaeological excavations which are not sanctioned by Ukraine can be justified. Likewise, any renovation or use of cultural sites, especially those on permanent or tentative UNESCO lists, must only be conducted pursuant to consultancy with and approval of the Ukrainian authorities.But the resonance of the Crimean case goes beyond law and touches on issues of the very survival of a people. The Soviet deportation of the Crimean Tatars in 1944 did not only result in the deaths of individuals. Their footprints in Crimea have been gradually erased by baseless treason charges, the long exile of the indigenous community from their native lands and ongoing persecution.First the Soviet Union and now Russia have targeted the Crimean Tatars’ cultural heritage to undermine their significance in the general historical narrative, making attempts to preserve or celebrate this culture seem futile. Russia is thus imposing its own historical and political hegemony at the expense of the Crimean Tatar and Ukrainian layers of Crimean history.As exemplified by occupied Crimea, the manipulation and exploitation of cultural heritage can serve an occupying power’s wider policies of appropriating history and asserting its own dominance. Domestic cultural property proceedings are challenging due to the lack of access to the occupied territory, but they should still be pursued.More effort is needed in the following areas: case prioritization; informing the documenters of alleged violations about the spectrum of cultural property crimes; developing domestic investigative and prosecutorial capacity, including by involving foreign expert consultancy; more proactively seeking bilateral and multilateral cooperation in art crime cases; liaising with auction houses (to track down objects originating from war-affected areas) and museums (to prevent the exhibition of the artefacts from occupied territories).When possible, cultural property crimes should also be reported to the ICC.Additionally, more international – public, policy, media and jurisprudential – attention to such violations is needed. Societies, courts and policymakers should have a clearer awareness that assaults against cultural heritage constitute a creeping encroachment on a people’s identity, endangering its very survival. Full Article
ac Virtual Roundtable: The Impact of COVID-19 on the Wider FSU Region By feedproxy.google.com Published On :: Thu, 16 Apr 2020 13:40:02 +0000 Invitation Only Research Event 21 April 2020 - 10:00am to 11:30am Event participants Christopher Davis, Professorial Fellow, Institute of Population Ageing, University of OxfordNino Evgenidze, Executive Director, EPRCKatya Gorchinskaya, Journalist, former CEO of Hromadske.uaKonstantin Sokulskiy, Head of Governance, UNDP, KazakhstanChair: James Nixey, Programme Director, Russia and Eurasia, Chatham House COVID-19 has put a serious strain on healthcare and economic systems around the world. This virtual roundtable will explore its impact on Russia, Ukraine, Georgia and Kazakhstan. Through a comparative examination of government and society responses, this event will show how COVID-19 has laid bare the region’s broader social, economic and political challenges. Department/project Russia and Eurasia Programme Anna Morgan Administrator, Ukraine Forum +44 (0)20 7389 3274 Email Full Article
ac Belarusians Left Facing COVID-19 Alone By feedproxy.google.com Published On :: Thu, 16 Apr 2020 15:19:10 +0000 16 April 2020 Ryhor Astapenia Robert Bosch Stiftung Academy Fellow, Russia and Eurasia Programme @ryhorastapenia LinkedIn Anaïs Marin Associate Fellow, Russia and Eurasia Programme LinkedIn The way the epidemic is being mismanaged creates a risk of political destabilisation and leaves the country exposed to external influence. 2020-04-16-Belarus-COVID-Football Playing accordion in front of dummy football fans in Brest, Belarus as the country's championship continues despite the COVID-19 outbreak. Photo by SERGEI GAPON/AFP via Getty Images. Since the World Health Organisation (WHO) declared COVID-19 a pandemic, few countries have chosen to ignore social distancing recommendations. But, even among those states which have, the Belarusian official response to its epidemic remains unique.President Aliaksandr Lukashenka’s statements that vodka, sauna and tractors are protecting Belarusians from coronavirus attracted amused attention in international media. Lukashenka also described other societies’ response to COVID-19 as ‘a massive psychosis’.Although Lukashenka is notorious for his awkward style of public communication, the fact that Belarus is refusing to impose comprehensive confinement measures is of concern. Belarusians continue to work, play football and socialise.Lukashenka, himself playing ice hockey in front of state cameras, claims it is the best way to stay healthy. Belarusian authorities clearly appear to be in denial – and this could have dire humanitarian consequences.From denial to half measuresBelarus actually has one of the largest numbers of hospital beds in the world per 1,000 of the population. But in the absence of quarantine measures its health system, already crippled by corruption and embezzlement, is likely to be overwhelmed.Patients being treated for pneumonia in hospitals have suggested medical staff are uninformed and inadequately equipped. It is claimed doctors are not reporting COVID-19 as the suspected cause of death, either through a lack of testing or for fear of reprisals.Observers believe the real mortality rate is already well above official figures (40 deaths as of 16 April). Based on an Imperial College London model, between 15,000 and 32,000 people could die under the current mild confinement regime – and such a high death toll would hugely impact the country’s political stability. Citing personal data protection, the Ministry of Health has imposed a total news blackout; the only cluster officially acknowledged so far is the city of Vitsebsk.Although specific Belarusian cities and some individuals started changing their approach – by extending school vacations or cancelling weddings – such measures remain half-hearted.Clearly a major reason for such an apparently irresponsible reaction is that Belarus cannot afford a massive lockdown that would freeze its already underdeveloped economy and drive it deeper into recession. Unlike many other nations, Belarus lacks budgetary resources for a sizable stimulus package. But a delayed response might backfire on the economy.Economic recession has been forecast to amount to at least 10% of GDP. For Lukashenka, who openly challenged conventional wisdom regarding the need for quarantine and isolation, such an economic downturn would harm his confidence rating in the eyes of Belarusian voters, mindful of the state’s mismanagement of the crisis. And it could create doubt within the ruling elite itself, with Lukashenka seeking re-election for a sixth mandate in late August.Against this backdrop, a radicalization of the opposition-minded part of society is also to be expected, with greater reliance on social networks in the face of official secrecy and disinformation. The expected response of the regime is then likely to be pre-emptive repression. Evidence is emerging that law enforcement agencies have already stepped up judicial and paralegal harassment of dissenters, notably independent journalists and bloggers.Russia’s initial reluctance to address the coronavirus crisis may also have influenced Belarus. Lukashenka and his administration often react to public health challenges by the Soviet rulebook, reminiscent of the Soviet authorities’ mismanagement of the Chernobyl disaster in 1986.Russia has unilaterally closed its borders with Belarus and, as bilateral relations continue to deteriorate, this casts further doubt on the viability of the Union State of Belarus and Russia. Pro-Russian media forecast Moscow will be unwilling to alleviate the expected socio-economic crisis, as it continues to reject Minsk’s demands regarding subsidised oil deliveries. Yet the Kremlin might use the crisis as an opportunity to resume its integrationist pressure on Belarus.China, with which Belarus engaged in a seemingly privileged strategic partnership in the 2010s, was actually the first country to dispatch humanitarian aid to beef up Belarusian capacity to fight the virus.But Minsk should not expect Beijing to rescue its economy and, unless it commits to more internal reforms, Belarus is not likely to receive much from the EU either. The regime has already applied to the IMF for emergency financial support, but conditions are attached and, even if successful, the funds would amount to no more than $900m.The government’s decision to take only half measures so far is rooted in the hope COVID-19 is not as bad as foreign experts fear. But, unless the leadership acknowledges the public health crisis and mitigates its economic impact, COVID-19 will accelerate Belarus’s slide back into international self-isolation. If combined with a humanitarian crisis, this will put the Belarusian regime under considerable stress.This crisis does risk a new ‘Chernobyl moment’ for the authorities, but the population could react more vocally this time. As volunteers self-organise to fight the epidemic, it might become more difficult for the authorities to say that it is efficient in running the country. But the bottom line is Belarus desperately needs money. Whoever steps up to support Belarus financially will also be able to heavily influence its politics. Full Article
ac Erratum: FTY720/fingolimod decreases hepatic steatosis and expression of fatty acid synthase in diet-induced nonalcoholic fatty liver disease in mice [Errata] By feedproxy.google.com Published On :: 2020-02-01T00:05:23-08:00 Full Article
ac Metallopeptidase Stp1 activates the transcription factor Sre1 in the carotenogenic yeast Xanthophyllomyces dendrorhous [Research Articles] By feedproxy.google.com Published On :: 2020-02-01T00:05:23-08:00 Xanthophyllomyces dendrorhous is a basidiomycete yeast known as a natural producer of astaxanthin, a carotenoid of commercial interest because of its antioxidant properties. Recent studies indicated that X. dendrorhous has a functional SREBP pathway involved in the regulation of isoprenoid compound biosynthesis, which includes ergosterol and carotenoids. SREBP is a major regulator of sterol metabolism and homeostasis in mammals; characterization in fungi also provides information about its role in the hypoxia adaptation response and virulence. SREBP protease processing is required to activate SREBP pathway functions in fungi. Here, we identified and described the STP1 gene, which encodes a metallopeptidase of the M50 family involved in the proteolytic activation of the transcription factor Sre1 of the SREBP pathway, in X. dendrorhous. We assessed STP1 function in stp1 strains derived from the wild-type and a mutant of ergosterol biosynthesis that overproduces carotenoids and sterols. Bioinformatic analysis of the deduced protein predicted the presence of characteristic features identified in homologs from mammals and fungi. The stp1 mutation decreased yeast growth in the presence of azole drugs and reduced transcript levels of Sre1-dependent genes. This mutation also negatively affected the carotenoid- and sterol-overproducing phenotype. Western blot analysis demonstrated that Sre1 was activated in the yeast ergosterol biosynthesis mutant and that the stp1 mutation introduced in this strain prevented Sre1 proteolytic activation. Overall, our results demonstrate that STP1 encodes a metallopeptidase involved in proteolytic activation of Sre1 in X. dendrorhous, contributing to our understanding of fungal SREBP pathways. Full Article
ac Effects of omega-O-acylceramide structures and concentrations in healthy and diseased skin barrier lipid membrane models [Research Articles] By feedproxy.google.com Published On :: 2020-02-01T00:05:23-08:00 Ceramides (Cers) with ultralong (~32-carbon) chains and -esterified linoleic acid, composing a subclass called omega-O-acylceramides (acylCers), are indispensable components of the skin barrier. Normal barriers typically contain acylCer concentrations of ~10 mol%; diminished concentrations, along with altered or missing long periodicity lamellar phase (LPP), and increased permeability accompany an array of skin disorders, including atopic dermatitis, psoriasis, and ichthyoses. We developed model membranes to investigate the effects of the acylCer structure and concentration on skin lipid organization and permeability. The model membrane systems contained six to nine Cer subclasses as well as fatty acids, cholesterol, and cholesterol sulfate; acylCer content—namely, acylCers containing sphingosine (Cer EOS), dihydrosphingosine (Cer EOdS), and phytosphingosine (Cer EOP) ranged from zero to 30 mol%. Systems with normal physiologic concentrations of acylCer mixture mimicked the permeability and nanostructure of human skin lipids (with regard to LPP, chain order, and lateral packing). The models also showed that the sphingoid base in acylCer significantly affects the membrane architecture and permeability and that Cer EOP, notably, is a weaker barrier component than Cer EOS and Cer EOdS. Membranes with diminished or missing acylCers displayed some of the hallmarks of diseased skin lipid barriers (i.e., lack of LPP, less ordered lipids, less orthorhombic chain packing, and increased permeability). These results could inform the rational design of new and improved strategies for the barrier-targeted treatment of skin diseases. Full Article
ac Endocytosis of very low-density lipoproteins: an unexpected mechanism for lipid acquisition by breast cancer cells [Research Articles] By feedproxy.google.com Published On :: 2020-02-01T00:05:23-08:00 We previously described the expression of CD36 and LPL by breast cancer (BC) cells and tissues and the growth-promoting effect of VLDL observed only in the presence of LPL. We now report a model in which LPL is bound to a heparan sulfate proteoglycan motif on the BC cell surface and acts in concert with the VLDL receptor to internalize VLDLs via receptor-mediated endocytosis. We also demonstrate that gene-expression programs for lipid synthesis versus uptake respond robustly to triglyceride-rich lipoprotein availability. The literature emphasizes de novo FA synthesis and exogenous free FA uptake using CD36 as paramount mechanisms for lipid acquisition by cancer cells. We find that the uptake of intact lipoproteins is also an important mechanism for lipid acquisition and that the relative reliance on lipid synthesis versus uptake varies among BC cell lines and in response to VLDL availability. This metabolic plasticity has important implications for the development of therapies aimed at the lipid dependence of many types of cancer, in that the inhibition of FA synthesis may elicit compensatory upregulation of lipid uptake. Moreover, the mechanism that we have elucidated provides a direct connection between dietary fat and tumor biology.. Full Article
ac A nematode sterol C4{alpha}-methyltransferase catalyzes a new methylation reaction responsible for sterol diversity [Research Articles] By feedproxy.google.com Published On :: 2020-02-01T00:05:23-08:00 Primitive sterol evolution plays an important role in fossil record interpretation and offers potential therapeutic avenues for human disease resulting from nematode infections. Recognizing that C4-methyl stenol products [8(14)-lophenol] can be synthesized in bacteria while C4-methyl stanol products (dinosterol) can be synthesized in dinoflagellates and preserved as sterane biomarkers in ancient sedimentary rock is key to eukaryotic sterol evolution. In this regard, nematodes have been proposed to convert dietary cholesterol to 8(14)-lophenol by a secondary metabolism pathway that could involve sterol C4 methylation analogous to the C2 methylation of hopanoids (radicle-type mechanism) or C24 methylation of sterols (carbocation-type mechanism). Here, we characterized dichotomous cholesterol metabolic pathways in Caenorhabditis elegans that generate 3-oxo sterol intermediates in separate paths to lophanol (4-methyl stanol) and 8(14)-lophenol (4-methyl stenol). We uncovered alternate C3-sterol oxidation and 7 desaturation steps that regulate sterol flux from which branching metabolite networks arise, while lophanol/8(14)-lophenol formation is shown to be dependent on a sterol C4α-methyltransferse (4-SMT) that requires 3-oxo sterol substrates and catalyzes a newly discovered 3-keto-enol tautomerism mechanism linked to S-adenosyl-l-methionine-dependent methylation. Alignment-specific substrate-binding domains similarly conserved in 4-SMT and 24-SMT enzymes, despite minimal amino acid sequence identity, suggests divergence from a common, primordial ancestor in the evolution of methyl sterols. The combination of these results provides evolutionary leads to sterol diversity and points to cryptic C4-methyl steroidogenic pathways of targeted convergence that mediate lineage-specific adaptations. Full Article
ac Lipid droplet-associated kinase STK25 regulates peroxisomal activity and metabolic stress response in steatotic liver [Research Articles] By feedproxy.google.com Published On :: 2020-02-01T00:05:23-08:00 Nonalcoholic fatty liver disease (NAFLD) and nonalcoholic steatohepatitis (NASH) are emerging as leading causes of liver disease worldwide and have been recognized as one of the major unmet medical needs of the 21st century. Our recent translational studies in mouse models, human cell lines, and well-characterized patient cohorts have identified serine/threonine kinase (STK)25 as a protein that coats intrahepatocellular lipid droplets (LDs) and critically regulates liver lipid homeostasis and progression of NAFLD/NASH. Here, we studied the mechanism-of-action of STK25 in steatotic liver by relative quantification of the hepatic LD-associated phosphoproteome from high-fat diet-fed Stk25 knockout mice compared with their wild-type littermates. We observed a total of 131 proteins and 60 phosphoproteins that were differentially represented in STK25-deficient livers. Most notably, a number of proteins involved in peroxisomal function, ubiquitination-mediated proteolysis, and antioxidant defense were coordinately regulated in Stk25–/– versus wild-type livers. We confirmed attenuated peroxisomal biogenesis and protection against oxidative and ER stress in STK25-deficient human liver cells, demonstrating the hepatocyte-autonomous manner of STK25’s action. In summary, our results suggest that regulation of peroxisomal function and metabolic stress response may be important molecular mechanisms by which STK25 controls the development and progression of NAFLD/NASH. Full Article
ac Quantification of bile acids: a mass spectrometry platform for studying gut microbe connection to metabolic diseases [Research Articles] By feedproxy.google.com Published On :: 2020-02-01T00:05:23-08:00 Bile acids (BAs) serve multiple biological functions, ranging from the absorption of lipids and fat-soluble vitamins to serving as signaling molecules through the direct activation of dedicated cellular receptors. Synthesized by both host and microbial pathways, BAs are increasingly understood as participating in the regulation of numerous pathways relevant to metabolic diseases, including lipid and glucose metabolism, energy expenditure, and inflammation. Quantitative analyses of BAs in biological matrices can be problematic due to their unusual and diverse physicochemical properties, making optimization of a method that shows good accuracy, precision, efficiency of extraction, and minimized matrix effects across structurally distinct human and murine BAs challenging. Herein we develop and clinically validate a stable-isotope-dilution LC/MS/MS method for the quantitative analysis of numerous primary and secondary BAs in both human and mouse biological matrices. We also utilize this tool to investigate gut microbiota participation in the generation of structurally specific BAs in both humans and mice. We examine circulating levels of specific BAs and in a clinical case-control study of age- and gender-matched type 2 diabetes mellitus (T2DM) versus nondiabetics. BAs whose circulating levels are associated with T2DM include numerous 12α-hydroxyl BAs (taurocholic acid, taurodeoxycholic acid, glycodeoxycholic acid, deoxycholic acid, and 3-ketodeoxycholic acid), while taurohyodeoxycholic acid was negatively associated with diabetes. The LC/MS/MS-based platform described should serve as a robust, high-throughput investigative tool for studying the potential involvement of structurally specific BAs and the gut microbiome on both physiological and disease processes. Full Article
ac Macrophage polarization is linked to Ca2+-independent phospholipase A2{beta}-derived lipids and cross-cell signaling in mice [Research Articles] By feedproxy.google.com Published On :: 2020-02-01T00:05:23-08:00 Phospholipases A2 (PLA2s) catalyze hydrolysis of the sn-2 substituent from glycerophospholipids to yield a free fatty acid (i.e., arachidonic acid), which can be metabolized to pro- or anti-inflammatory eicosanoids. Macrophages modulate inflammatory responses and are affected by Ca2+-independent phospholipase A2 (PLA2)β (iPLA2β). Here, we assessed the link between iPLA2β-derived lipids (iDLs) and macrophage polarization. Macrophages from WT and KO (iPLA2β–/–) mice were classically M1 pro-inflammatory phenotype activated or alternatively M2 anti-inflammatory phenotype activated, and eicosanoid production was determined by ultra-performance LC ESI-MS/MS. As a genotypic control, we performed similar analyses on macrophages from RIP.iPLA2β.Tg mice with selective iPLA2β overexpression in β-cells. Compared with WT, generation of select pro-inflammatory prostaglandins (PGs) was lower in iPLA2β–/–, and that of a specialized pro-resolving lipid mediator (SPM), resolvin D2, was higher; both changes are consistent with the M2 phenotype. Conversely, macrophages from RIP.iPLA2β.Tg mice exhibited an opposite landscape, one associated with the M1 phenotype: namely, increased production of pro-inflammatory eicosanoids (6-keto PGF1α, PGE2, leukotriene B4) and decreased ability to generate resolvin D2. These changes were not linked with secretory PLA2 or cytosolic PLA2α or with leakage of the transgene. Thus, we report previously unidentified links between select iPLA2β-derived eicosanoids, an SPM, and macrophage polarization. Importantly, our findings reveal for the first time that β-cell iPLA2β-derived signaling can predispose macrophage responses. These findings suggest that iDLs play critical roles in macrophage polarization, and we posit that they could be targeted therapeutically to counter inflammation-based disorders. Full Article
ac Novel GPR120 agonist TUG891 modulates fat taste perception and preference and activates tongue-brain-gut axis in mice [Research Articles] By feedproxy.google.com Published On :: 2020-02-01T00:05:23-08:00 GPR120 is implicated as a lipid receptor in the oro-sensory detection of dietary fatty acids. However, the effects of GPR120 activation on dietary fat intake or obesity are not clearly understood. We investigated to determine whether the binding of TUG891, a novel GPR120 agonist, to lingual GPR120 modulates fat preference in mice. We explored the effects of TUG891 on obesity-related hormones and conducted behavioral choice tests on mice to better understand the physiologic relevance of the action of TUG891. In cultured mouse and human taste bud cells (TBCs), TUG891 induced a rapid increase in Ca2+ by acting on GPR120. A long-chain dietary fatty acid, linoleic acid (LA), also recruited Ca2+ via GPR120 in human and mouse TBCs. Both TUG891 and LA induced ERK1/2 phosphorylation and enhanced in vitro release of glucagon-like peptide-1 from cultured human and mouse TBCs. In situ application of TUG891 onto the tongue of anesthetized mice triggered the secretion of pancreatobiliary juice, probably via the tongue-brain-gut axis. Furthermore, lingual application of TUG891 altered circulating concentrations of cholecystokinin and adipokines, associated with decreased circulating LDL, in conscious mice. In behavioral tests, mice exhibited a spontaneous preference for solutions containing either TUG891 or LA instead of a control. However, addition of TUG891 to a solution containing LA significantly curtailed fatty acid preference. Our study demonstrates that TUG891 binds to lingual GPR120 receptors, activates the tongue-brain-gut axis, and modulates fat preference. These findings may support the development of new fat taste analogs that can change the approach to obesity prevention and treatment. Full Article
ac Deficiency in ZMPSTE24 and resulting farnesyl-prelamin A accumulation only modestly affect mouse adipose tissue stores [Research Articles] By feedproxy.google.com Published On :: 2020-03-01T00:06:33-08:00 Zinc metallopeptidase STE24 (ZMPSTE24) is essential for the conversion of farnesyl–prelamin A to mature lamin A, a key component of the nuclear lamina. In the absence of ZMPSTE24, farnesyl–prelamin A accumulates in the nucleus and exerts toxicity, causing a variety of disease phenotypes. By ~4 months of age, both male and female Zmpste24–/– mice manifest a near-complete loss of adipose tissue, but it has never been clear whether this phenotype is a direct consequence of farnesyl–prelamin A toxicity in adipocytes. To address this question, we generated a conditional knockout Zmpste24 allele and used it to create adipocyte-specific Zmpste24–knockout mice. To boost farnesyl–prelamin A levels, we bred in the "prelamin A–only" Lmna allele. Gene expression, immunoblotting, and immunohistochemistry experiments revealed that adipose tissue in these mice had decreased Zmpste24 expression along with strikingly increased accumulation of prelamin A. In male mice, Zmpste24 deficiency in adipocytes was accompanied by modest changes in adipose stores (an 11% decrease in body weight, a 23% decrease in body fat mass, and significantly smaller gonadal and inguinal white adipose depots). No changes in adipose stores were detected in female mice, likely because prelamin A expression in adipose tissue is lower in female mice. Zmpste24 deficiency in adipocytes did not alter the number of macrophages in adipose tissue, nor did it alter plasma levels of glucose, triglycerides, or fatty acids. We conclude that ZMPSTE24 deficiency in adipocytes, and the accompanying accumulation of farnesyl–prelamin A, reduces adipose tissue stores, but only modestly and only in male mice. Full Article
ac Role of angiopoietin-like protein 3 in sugar-induced dyslipidemia in rhesus macaques: suppression by fish oil or RNAi [Research Articles] By feedproxy.google.com Published On :: 2020-03-01T00:06:33-08:00 Angiopoietin-like protein 3 (ANGPTL3) inhibits lipid clearance and is a promising target for managing cardiovascular disease. Here we investigated the effects of a high-sugar (high-fructose) diet on circulating ANGPTL3 concentrations in rhesus macaques. Plasma ANGPTL3 concentrations increased ~30% to 40% after 1 and 3 months of a high-fructose diet (both P < 0.001 vs. baseline). During fructose-induced metabolic dysregulation, plasma ANGPTL3 concentrations were positively correlated with circulating indices of insulin resistance [assessed with fasting insulin and the homeostatic model assessment of insulin resistance (HOMA-IR)], hypertriglyceridemia, adiposity (assessed as leptin), and systemic inflammation [C-reactive peptide (CRP)] and negatively correlated with plasma levels of the insulin-sensitizing hormone adropin. Multiple regression analyses identified a strong association between circulating APOC3 and ANGPTL3 concentrations. Higher baseline plasma levels of both ANGPTL3 and APOC3 were associated with an increased risk for fructose-induced insulin resistance. Fish oil previously shown to prevent insulin resistance and hypertriglyceridemia in this model prevented increases of ANGPTL3 without affecting systemic inflammation (increased plasma CRP and interleukin-6 concentrations). ANGPTL3 RNAi lowered plasma concentrations of ANGPTL3, triglycerides (TGs), VLDL-C, APOC3, and APOE. These decreases were consistent with a reduced risk of atherosclerosis. In summary, dietary sugar-induced increases of circulating ANGPTL3 concentrations after metabolic dysregulation correlated positively with leptin levels, HOMA-IR, and dyslipidemia. Targeting ANGPTL3 expression with RNAi inhibited dyslipidemia by lowering plasma TGs, VLDL-C, APOC3, and APOE levels in rhesus macaques. Full Article
ac Alirocumab, evinacumab, and atorvastatin triple therapy regresses plaque lesions and improves lesion composition in mice [Research Articles] By feedproxy.google.com Published On :: 2020-03-01T00:06:33-08:00 Atherosclerosis-related CVD causes nearly 20 million deaths annually. Most patients are treated after plaques develop, so therapies must regress existing lesions. Current therapies reduce plaque volume, but targeting all apoB-containing lipoproteins with intensive combinations that include alirocumab or evinacumab, monoclonal antibodies against cholesterol-regulating proprotein convertase subtilisin/kexin type 9 and angiopoietin-like protein 3, may provide more benefit. We investigated the effect of such lipid-lowering interventions on atherosclerosis in APOE*3-Leiden.CETP mice, a well-established model for hyperlipidemia. Mice were fed a Western-type diet for 13 weeks and thereafter matched into a baseline group (euthanized at 13 weeks) and five groups that received diet alone (control) or with treatment [atorvastatin; atorvastatin and alirocumab; atorvastatin and evinacumab; or atorvastatin, alirocumab, and evinacumab (triple therapy)] for 25 weeks. We measured effects on cholesterol levels, plaque composition and morphology, monocyte adherence, and macrophage proliferation. All interventions reduced plasma total cholesterol (37% with atorvastatin to 80% with triple treatment; all P < 0.001). Triple treatment decreased non-HDL-C to 1.0 mmol/l (91% difference from control; P < 0.001). Atorvastatin reduced atherosclerosis progression by 28% versus control (P < 0.001); double treatment completely blocked progression and diminished lesion severity. Triple treatment regressed lesion size versus baseline in the thoracic aorta by 50% and the aortic root by 36% (both P < 0.05 vs. baseline), decreased macrophage accumulation through reduced proliferation, and abated lesion severity. Thus, high-intensive cholesterol-lowering triple treatment targeting all apoB-containing lipoproteins regresses atherosclerotic lesion area and improves lesion composition in mice, making it a promising potential approach for treating atherosclerosis. Full Article
ac Role of pyruvate kinase M2 in oxidized LDL-induced macrophage foam cell formation and inflammation [Research Articles] By feedproxy.google.com Published On :: 2020-03-01T00:06:33-08:00 Pyruvate kinase M2 (PKM2) links metabolic and inflammatory dysfunction in atherosclerotic coronary artery disease; however, its role in oxidized LDL (Ox-LDL)-induced macrophage foam cell formation and inflammation is unknown and therefore was studied. In recombinant mouse granulocyte-macrophage colony-stimulating factor-differentiated murine bone marrow-derived macrophages, early (1–6 h) Ox-LDL treatment induced PKM2 tyrosine 105 phosphorylation and promotes its nuclear localization. PKM2 regulates aerobic glycolysis and inflammation because PKM2 shRNA or Shikonin abrogated Ox-LDL-induced hypoxia-inducible factor-1α target genes lactate dehydrogenase, glucose transporter member 1, interleukin 1β (IL-1β) mRNA expression, lactate, and secretory IL-1β production. PKM2 inhibition significantly increased Ox-LDL-induced ABCA1 and ABCG1 protein expression and NBD-cholesterol efflux to apoA1 and HDL. PKM2 shRNA significantly inhibited Ox-LDL-induced CD36, FASN protein expression, DiI-Ox-LDL binding and uptake, and cellular total cholesterol, free cholesterol, and cholesteryl ester content. Therefore, PKM2 regulates lipid uptake and efflux. DASA-58, a PKM2 activator, downregulated LXR-α, ABCA1, and ABCG1, and augmented FASN and CD36 protein expression. Peritoneal macrophages showed similar results. Ox-LDL induced PKM2- SREBP-1 interaction and FASN expression in a PKM2-dependent manner. Therefore, this study suggests a role for PKM2 in Ox-LDL-induced aerobic glycolysis, inflammation, and macrophage foam cell formation. Full Article
ac A human-like bile acid pool induced by deletion of hepatic Cyp2c70 modulates effects of FXR activation in mice [Research Articles] By feedproxy.google.com Published On :: 2020-03-01T00:06:33-08:00 Bile acids (BAs) facilitate intestinal absorption of lipid-soluble nutrients and modulate various metabolic pathways through the farnesoid X receptor (FXR) and Takeda G-protein-coupled receptor 5. These receptors are targets for therapy in cholestatic and metabolic diseases. However, dissimilarities in BA metabolism between humans and mice complicate translation of preclinical data. Cytochrome P450 family 2 subfamily c polypeptide 70 (CYP2C70) was recently proposed to catalyze the formation of rodent-specific muricholic acids (MCAs). With CRISPR/Cas9-mediated somatic genome editing, we generated an acute hepatic Cyp2c70 knockout mouse model (Cyp2c70ako) to clarify the role of CYP2C70 in BA metabolism in vivo and evaluate whether its activity modulates effects of pharmacologic FXR activation on cholesterol homeostasis. In Cyp2c70ako mice, chenodeoxycholic acid (CDCA) increased at the expense of βMCA, resulting in a more hydrophobic human-like BA pool. Tracer studies demonstrated that, in vivo, CYP2C70 catalyzes the formation of βMCA primarily by sequential 6β-hydroxylation and C7-epimerization of CDCA, generating αMCA as an intermediate metabolite. Physiologically, the humanized BA composition in Cyp2c70ako mice blunted the stimulation of fecal cholesterol disposal in response to FXR activation compared with WT mice, predominantly due to reduced stimulation of transintestinal cholesterol excretion. Thus, deletion of hepatic Cyp2c70 in adult mice translates into a human-like BA pool composition and impacts the response to pharmacologic FXR activation. This Cyp2c70ako mouse model may be a useful tool for future studies of BA signaling and metabolism that informs human disease development and treatment. Full Article
ac Is CYP2C70 the key to new mouse models to understand bile acids in humans? [Commentary] By feedproxy.google.com Published On :: 2020-03-01T00:06:33-08:00 Full Article
ac Erratum: Unequivocal evidence for endogenous geranylgeranoic acid biosynthesized from mevalonate in mammalian cells [Errata] By feedproxy.google.com Published On :: 2020-04-01T00:05:29-07:00 Full Article
ac An LC/MS/MS method for analyzing the steroid metabolome with high accuracy and from small serum samples [Methods] By feedproxy.google.com Published On :: 2020-04-01T00:05:29-07:00 Analyzing global steroid metabolism in humans can shed light on the etiologies of steroid-related diseases. However, existing methods require large amounts of serum and lack the evaluation of accuracy. Here, we developed an LC/MS/MS method for the simultaneous quantification of 12 steroid hormones: testosterone, pregnenolone, progesterone, androstenedione, corticosterone, 11-deoxycortisol, cortisol, 17-hydroxypregnenolone, 17-hydroxyprogesterone, dehydroepiandrosterone, estriol, and estradiol. Steroids and spiked internal standards in 100 μl serum were extracted by protein precipitation and liquid-liquid extraction. The organic phase was dried by evaporation, and isonicotinoyl chloride was added for steroid derivatization, followed by evaporation under nitrogen and redissolution in 50% methanol. Chromatographic separation was performed on a reverse-phase PFP column, and analytes were detected on a triple quadrupole mass spectrometer with ESI. The lower limits of quantification ranged from 0.005 ng/ml for estradiol to 1 ng/ml for cortisol. Apparent recoveries of steroids at high, medium, and low concentrations in quality control samples were between 86.4% and 115.0%. There were limited biases (–10.7% to 10.5%) between the measured values and the authentic values, indicating that the method has excellent reliability. An analysis of the steroid metabolome in pregnant women highlighted the applicability of the method in clinical serum samples. We conclude that the LC/MS/MS method reported here enables steroid metabolome analysis with high accuracy and reduced serum consumption, indicating that it may be a useful tool in both clinical and scientific laboratory research. Full Article
ac Development of a sensitive and quantitative method for the identification of two major furan fatty acids in human plasma [Methods] By feedproxy.google.com Published On :: 2020-04-01T00:05:29-07:00 This article focuses on the establishment of an accurate and sensitive quantitation method for the analysis of furan fatty acids. In particular, the sensitivity of GC/MS and UPLC/ESI/MS/MS was compared for the identification and quantification of furan fatty acids. Different methylation methods were tested with respect to GC/MS analysis. Special attention needs to be paid to the methylation of furan fatty acids, as acidic catalysts might lead to the degradation of the furan ring. GC/MS analysis in full-scan mode demonstrated that the limit of quantitation was 10 μM. UPLC/ESI/MS/MS in multiple reaction monitoring mode displayed a higher detection sensitivity than GC/MS. Moreover, the identification of furan fatty acids with charge-reversal derivatization was tested in the positive mode with two widely used pyridinium salts. Significant oxidation was unexpectedly observed using N-(4-aminomethylphenyl) pyridinium as a derivatization agent. The formed 3-acyl-oxymethyl-1-methylpyridinium iodide derivatized by 2-bromo-1-methylpyridinium iodide and 3-carbinol-1-methylpyridinium iodide improved the sensitivity more than 2,000-fold compared with nonderivatization in the negative mode by UPLC/ESI/MS/MS. This charge-reversal derivatization enabled the targeted quantitation of furan fatty acids in human plasma. Thus, it is anticipated that this protocol could greatly contribute to the clarification of pathological mechanisms related to furan fatty acids and their metabolites. Full Article
ac A novel NanoBiT-based assay monitors the interaction between lipoprotein lipase and GPIHBP1 in real time [Methods] By feedproxy.google.com Published On :: 2020-04-01T00:05:29-07:00 The hydrolysis of triglycerides in triglyceride-rich lipoproteins by LPL is critical for the delivery of triglyceride-derived fatty acids to tissues, including heart, skeletal muscle, and adipose tissues. Physiologically active LPL is normally bound to the endothelial cell protein glycosylphosphatidylinositol-anchored high-density lipoprotein binding protein 1 (GPIHBP1), which transports LPL across endothelial cells, anchors LPL to the vascular wall, and stabilizes LPL activity. Disruption of LPL-GPIHBP1 binding significantly alters triglyceride metabolism and lipid partitioning. In this study, we modified the NanoLuc® Binary Technology split-luciferase system to develop a novel assay that monitors the binding of LPL to GPIHBP1 on endothelial cells in real time. We validated the specificity and sensitivity of the assay using endothelial lipase and a mutant version of LPL and found that this assay reliably and specifically detected the interaction between LPL and GPIHBP1. We then interrogated various endogenous and exogenous inhibitors of LPL-mediated lipolysis for their ability to disrupt the binding of LPL to GPIHBP1. We found that angiopoietin-like (ANGPTL)4 and ANGPTL3-ANGPTL8 complexes disrupted the interactions of LPL and GPIHBP1, whereas the exogenous LPL blockers we tested (tyloxapol, poloxamer-407, and tetrahydrolipstatin) did not. We also found that chylomicrons could dissociate LPL from GPIHBP1 and found evidence that this dissociation was mediated in part by the fatty acids produced by lipolysis. These results demonstrate the ability of this assay to monitor LPL-GPIHBP1 binding and to probe how various agents influence this important complex. Full Article
ac Hexacosenoyl-CoA is the most abundant very long-chain acyl-CoA in ATP binding cassette transporter D1-deficient cells [Patient-Oriented and Epidemiological Research] By feedproxy.google.com Published On :: 2020-04-01T00:05:29-07:00 X-linked adrenoleukodystrophy (X-ALD) is an inherited disorder caused by deleterious mutations in the ABCD1 gene. The ABCD1 protein transports very long-chain FAs (VLCFAs) from the cytosol into the peroxisome where the VLCFAs are degraded through β-oxidation. ABCD1 dysfunction leads to VLCFA accumulation in individuals with X-ALD. FAs are activated by esterification to CoA before metabolic utilization. However, the intracellular pools and metabolic profiles of individual acyl-CoA esters have not been fully analyzed. In this study, we profiled the acyl-CoA species in fibroblasts from X-ALD patients and in ABCD1-deficient HeLa cells. We found that hexacosenoyl (26:1)-CoA, but not hexacosanoyl (26:0)-CoA, was the most abundantly concentrated among the VLCFA-CoA species in these cells. We also show that 26:1-CoA is mainly synthesized from oleoyl-CoA, and the metabolic turnover rate of 26:1-CoA was almost identical to that of oleoyl-CoA in both WT and ABCD1-deficient HeLa cells. The findings of our study provide precise quantitative and metabolic information of each acyl-CoA species in living cells. Our results suggest that VLCFA is endogenously synthesized as VLCFA-CoA through a FA elongation pathway and is then efficiently converted to other metabolites, such as phospholipids, in the absence of ABCD1. Full Article
ac HDL inhibits endoplasmic reticulum stress-induced apoptosis of pancreatic {beta}-cells in vitro by activation of Smoothened [Research Articles] By feedproxy.google.com Published On :: 2020-04-01T00:05:29-07:00 Loss of pancreatic β-cell mass and function as a result of sustained ER stress is a core step in the pathogenesis of diabetes mellitus type 2. The complex control of β-cells and insulin production involves hedgehog (Hh) signaling pathways as well as cholesterol-mediated effects. In fact, data from studies in humans and animal models suggest that HDL protects against the development of diabetes through inhibition of ER stress and β-cell apoptosis. We investigated the mechanism by which HDL inhibits ER stress and apoptosis induced by thapsigargin, a sarco/ER Ca2+-ATPase inhibitor, in β-cells of a rat insulinoma cell line, INS1e. We further explored effects on the Hh signaling receptor Smoothened (SMO) with pharmacologic agonists and inhibitors. Interference with sterol synthesis or efflux enhanced β-cell apoptosis and abrogated the anti-apoptotic activity of HDL. During ER stress, HDL facilitated the efflux of specific oxysterols, including 24-hydroxycholesterol (OHC). Supplementation of reconstituted HDL with 24-OHC enhanced and, in cells lacking ABCG1 or the 24-OHC synthesizing enzyme CYP46A1, restored the protective activity of HDL. Inhibition of SMO countered the beneficial effects of HDL and also LDL, and SMO agonists decreased β-cell apoptosis in the absence of ABCG1 or CYP46A1. The translocation of the SMO-activated transcription factor glioma-associated oncogene GLI-1 was inhibited by ER stress but restored by both HDL and 24-OHC. In conclusion, the protective effect of HDL to counter ER stress and β-cell death involves the transport, generation, and mobilization of oxysterols for activation of the Hh signaling receptor SMO Full Article
ac Of mice and men: murine bile acids explain species differences in the regulation of bile acid and cholesterol metabolism [Research Articles] By feedproxy.google.com Published On :: 2020-04-01T00:05:29-07:00 Compared with humans, rodents have higher synthesis of cholesterol and bile acids (BAs) and faster clearance and lower levels of serum LDL-cholesterol. Paradoxically, they increase BA synthesis in response to bile duct ligation (BDL). Another difference is the production of hydrophilic 6-hydroxylated muricholic acids (MCAs), which may antagonize the activation of FXRs, in rodents versus humans. We hypothesized that the presence of MCAs is key for many of these metabolic differences between mice and humans. We thus studied the effects of genetic deletion of the Cyp2c70 gene, previously proposed to control MCA formation. Compared with WT animals, KO mice created using the CRISPR/Cas9 system completely lacked MCAs, and displayed >50% reductions in BA and cholesterol synthesis and hepatic LDL receptors, leading to a marked increase in serum LDL-cholesterol. The doubling of BA synthesis following BDL in WT animals was abolished in KO mice, despite extinguished intestinal fibroblast growth factor (Fgf)15 expression in both groups. Accumulation of cholesterol-enriched particles ("Lp-X") in serum was almost eliminated in KO mice. Livers of KO mice were increased 18% in weight, and serum markers of liver function indicated liver damage. The human-like phenotype of BA metabolism in KO mice could not be fully explained by the activation of FXR-mediated changes. In conclusion, the presence of MCAs is critical for many of the known metabolic differences between mice and humans. The Cyp2c70-KO mouse should be useful in studies exploring potential therapeutic targets for human disease. Full Article
ac The data must be accessible to all [Editorials] By feedproxy.google.com Published On :: 2020-04-01T00:05:29-07:00 Full Article
ac SSO and other putative inhibitors of FA transport across membranes by CD36 disrupt intracellular metabolism, but do not affect FA translocation [Research Articles] By feedproxy.google.com Published On :: 2020-05-01T00:05:28-07:00 Membrane-bound proteins have been proposed to mediate the transport of long-chain FA (LCFA) transport through the plasma membrane (PM). These proposals are based largely on reports that PM transport of LCFAs can be blocked by a number of enzymes and purported inhibitors of LCFA transport. Here, using the ratiometric pH indicator (2',7'-bis-(2-carboxyethyl)-5-(and-6-)-carboxyfluorescein and acrylodated intestinal FA-binding protein-based dual fluorescence assays, we investigated the effects of nine inhibitors of the putative FA transporter protein CD36 on the binding and transmembrane movement of LCFAs. We particularly focused on sulfosuccinimidyl oleate (SSO), reported to be a competitive inhibitor of CD36-mediated LCFA transport. Using these assays in adipocytes and inhibitor-treated protein-free lipid vesicles, we demonstrate that rapid LCFA transport across model and biological membranes remains unchanged in the presence of these purported inhibitors. We have previously shown in live cells that CD36 does not accelerate the transport of unesterified LCFAs across the PM. Our present experiments indicated disruption of LCFA metabolism inside the cell within minutes upon treatment with many of the "inhibitors" previously assumed to inhibit LCFA transport across the PM. Furthermore, using confocal microscopy and a specific anti-SSO antibody, we found that numerous intracellular and PM-bound proteins are SSO-modified in addition to CD36. Our results support the hypothesis that LCFAs diffuse rapidly across biological membranes and do not require an active protein transporter for their transmembrane movement. Full Article
ac Hepatic monoamine oxidase B is involved in endogenous geranylgeranoic acid synthesis in mammalian liver cells [Research Articles] By feedproxy.google.com Published On :: 2020-05-01T00:05:28-07:00 Geranylgeranoic acid (GGA) originally was identified in some animals and has been developed as an agent for preventing second primary hepatoma. We previously have also identified GGA as an acyclic diterpenoid in some medicinal herbs. Recently, we reported that in human hepatoma-derived HuH-7 cells, GGA is metabolically labeled from 13C-mevalonate. Several cell-free experiments have demonstrated that GGA is synthesized through geranylgeranial by oxygen-dependent oxidation of geranylgeraniol (GGOH), but the exact biochemical events giving rise to GGA in hepatoma cells remain unclear. Monoamine oxidase B (MOAB) has been suggested to be involved in GGOH oxidation. Here, using two human hepatoma cell lines, we investigated whether MAOB contributes to GGA biosynthesis. Using either HuH-7 cell lysates or recombinant human MAOB, we found that: 1) the MAO inhibitor tranylcypromine dose-dependently downregulates endogenous GGA levels in HuH-7 cells; and 2) siRNA-mediated MAOB silencing reduces intracellular GGA levels in HuH-7 and Hep3B cells. Unexpectedly, however, CRISPR/Cas9-generated MAOB-KO human hepatoma Hep3B cells had GGA levels similar to those in MAOB-WT cells. A sensitivity of GGA levels to siRNA-mediated MAOB downregulation was recovered when the MAOB-KO cells were transfected with a MAOB-expression plasmid, suggesting that MAOB is the enzyme primarily responsible for GGOH oxidation and that some other latent metabolic pathways may maintain endogenous GGA levels in the MAOB-KO hepatoma cells. Along with the previous findings, these results provide critical insights into the biological roles of human MAOB and provide evidence that hepatic MAOB is involved in endogenous GGA biosynthesis via GGOH oxidation. Full Article
ac Slc43a3 is a regulator of free fatty acid flux [Research Articles] By feedproxy.google.com Published On :: 2020-05-01T00:05:27-07:00 Adipocytes take up long chain FAs through diffusion and protein-mediated transport, whereas FA efflux is considered to occur by diffusion. To identify potential membrane proteins that are involved in regulating FA flux in adipocytes, the expression levels of 55 membrane transporters without known function were screened in subcutaneous adipose samples from obese patients before and after bariatric surgery using branched DNA methodology. Among the 33 solute carrier (SLC) transporter family members screened, the expression of 14 members showed significant changes before and after bariatric surgery. One of them, Slc43a3, increased about 2.5-fold after bariatric surgery. Further investigation demonstrated that Slc43a3 is highly expressed in murine adipose tissue and induced during adipocyte differentiation in primary preadipocytes and in OP9 cells. Knockdown of Slc43a3 with siRNA in differentiated OP9 adipocytes reduced both basal and forskolin-stimulated FA efflux, while also increasing FA uptake and lipid droplet accumulation. In contrast, overexpression of Slc43a3 decreased FA uptake in differentiated OP9 cells and resulted in decreased lipid droplet accumulation. Therefore, Slc43a3 seems to regulate FA flux in adipocytes, functioning as a positive regulator of FA efflux and as a negative regulator of FA uptake. Full Article
ac The grease trap: uncovering the mechanism of the hydrophobic lid in Cutibacterium acnes lipase [Research Articles] By feedproxy.google.com Published On :: 2020-05-01T00:05:27-07:00 Acne is one of the most common dermatological conditions, but the details of its pathology are unclear, and current management regimens often have adverse effects. Cutibacterium acnes is known as a major acne-associated bacterium that derives energy from lipase-mediated sebum lipid degradation. C. acnes is commensal, but lipase activity has been observed to differ among C. acnes types. For example, higher populations of the type IA strains are present in acne lesions with higher lipase activity. In the present study, we examined a conserved lipase in types IB and II that was truncated in type IA C. acnes strains. Closed, blocked, and open structures of C. acnes ATCC11828 lipases were elucidated by X-ray crystallography at 1.6–2.4 Å. The closed crystal structure, which is the most common form in aqueous solution, revealed that a hydrophobic lid domain shields the active site. By comparing closed, blocked, and open structures, we found that the lid domain-opening mechanisms of C. acnes lipases (CAlipases) involve the lid-opening residues, Phe-179 and Phe-211. To the best of our knowledge, this is the first structure-function study of CAlipases, which may help to shed light on the mechanisms involved in acne development and may aid in future drug design. Full Article
ac The ins and outs of lipid rafts: functions in intracellular cholesterol homeostasis, microparticles, and cell membranes [Thematic Reviews] By feedproxy.google.com Published On :: 2020-05-01T00:05:27-07:00 Cellular membranes are not homogenous mixtures of proteins; rather, they are segregated into microdomains on the basis of preferential association between specific lipids and proteins. These microdomains, called lipid rafts, are well known for their role in receptor signaling on the plasma membrane (PM) and are essential to such cellular functions as signal transduction and spatial organization of the PM. A number of disease states, including atherosclerosis and other cardiovascular disorders, may be caused by dysfunctional maintenance of lipid rafts. Lipid rafts do not occur only in the PM but also have been found in intracellular membranes and extracellular vesicles (EVs). Here, we focus on discussing newly discovered functions of lipid rafts and microdomains in intracellular membranes, including lipid and protein trafficking from the ER, Golgi bodies, and endosomes to the PM, and we examine lipid raft involvement in the production and composition of EVs. Because lipid rafts are small and transient, visualization remains challenging. Future work with advanced techniques will continue to expand our knowledge about the roles of lipid rafts in cellular functioning. Full Article
ac Commentary on SSO and other putative inhibitors of FA transport across membranes by CD36 disrupt intracellular metabolism, but do not affect fatty acid translocation [Commentaries] By feedproxy.google.com Published On :: 2020-05-01T00:05:27-07:00 Full Article
ac Membrane domains beyond the reach of microscopy [Commentaries] By feedproxy.google.com Published On :: 2020-05-01T00:05:27-07:00 Full Article
ac Problem Notes for SAS®9 - 65940: You might receive "ERROR: PI Point not found" when you query a PI tag name that contains a special character such as an ampersand (&) By feedproxy.google.com Published On :: Fri, 8 May 2020 11:20:36 EST When you query a PI tag name or element that contains a special character, such as an ampersand (&), you might receive the following error: Full Article OSISOFT+SAS/ACCESS+Interface+to+the+PI+S
ac Problem Notes for SAS®9 - 65939: "ERROR: Unable to transcode data to/from UCS-2 encoding" occurs when you run an SQL query using SAS/ACCESS Interface to ODBC on SAS 9.4M5 with UTF-8 By feedproxy.google.com Published On :: Fri, 8 May 2020 11:20:02 EST When you run an SQL query using SAS/ACCESS Interface to ODBC under the following conditions, you might receive an error: You run SAS 9.4M5 (TS1M5) or SAS 9.4M6 (TS1M6) i Full Article ODBC+SAS/ACCESS+Interface+to+ODBC
ac Problem Notes for SAS®9 - 65900: Registering an Oracle table to the metadata might fail and generate an error By feedproxy.google.com Published On :: Fri, 8 May 2020 09:38:11 EST When you register an Oracle table to the metadata, it might fail and generate an error similar to the following: "ERROR: An exception has been encountered...ERROR: Read Access Violation METALIB..." Full Article METADATASRV+SAS+Metadata+Server
ac Problem Notes for SAS®9 - 65834: PROC METADATA returns various errors when the input contains certain multi-byte characters By feedproxy.google.com Published On :: Thu, 7 May 2020 17:12:13 EST The METADATA procedure might return an error similar to one of the following: ERROR: Missing root element definition. Full Article BASE+Base+SAS
ac Problem Notes for SAS®9 - 65899: "ERROR: ORACLE disconnect error: ORA-03135" occurs when SAS disconnects from the Oracle database server By feedproxy.google.com Published On :: Thu, 7 May 2020 08:04:08 EST When you run 32-bit SAS on Windows and disconnect from the Oracle database server, you might see the error: "ERROR: ORACLE disconnect error: ORA-03135: connection lost contact." Full Article ORACLE+SAS/ACCESS+Interface+to+Oracle
ac Problem Notes for SAS®9 - 65908: The IMPORT procedure contains a stack-corruption vulnerability By feedproxy.google.com Published On :: Wed, 6 May 2020 10:55:40 EST Severity: Medium Description: PROC IMPORT contains a stack-corruption vulnerability. Potential Impact: Under certain circumstances (with use of the DBM Full Article BASE+Base+SAS
ac Problem Notes for SAS®9 - 65906: The EXPORT procedure contains a stack-corruption vulnerability By feedproxy.google.com Published On :: Wed, 6 May 2020 10:55:01 EST Severity: Medium Description: PROC EXPORT contains a stack-corruption vulnerability. Potential Impact: Under certain circumstances, the use of PROC EXP Full Article BASE+Base+SAS
ac Problem Notes for SAS®9 - 65916: Accessing a Google BigQuery table without including the SCHEMA= option in the LIBNAME statement might result in an error By feedproxy.google.com Published On :: Wed, 6 May 2020 09:41:22 EST When you issue a LIBNAME statement for a Google BigQuery database without including the SCHEMA= option, all tables in the project are shown when the libref is expanded. However, if you try to acces Full Article BIGQUERY+SAS/ACCESS+Interface+to+Google+
ac Problem Notes for SAS®9 - 65935: The UNICODE function does not support Numeric Character Representation (NCR) for a surrogate pair By feedproxy.google.com Published On :: Wed, 6 May 2020 09:33:48 EST Using the NCR form of a surrogate pair as an input string to the UNICODE function does not convert the string to the appropriate display character. Full Article BASE+Base+SAS
ac Problem Notes for SAS®9 - 34294: A missing discrete dependent variable in the selection model together with a OUTPUT statement might cause an Access Violation error By feedproxy.google.com Published On :: Tue, 5 May 2020 13:04:13 EST If the following conditions are met in PROC QLIM: the SELECT option and DISCRETE option are specified in the same MODEL statement or ENDOGENOUS statement the same dependent variable with S Full Article ETS+SAS/ETS
ac Problem Notes for SAS®9 - 65927: The Copy Files task in SAS Enterprise Guide 8.2 fails with the message "ERROR: Target folder does not exist or cannot be accessed" By feedproxy.google.com Published On :: Tue, 5 May 2020 09:59:15 EST When you run the Copy Files task in SAS Enterprise Guide and there is no connection to a SAS server, it fails with the following error: "ERROR: Target folder does not exist or cannot be accessed." Full Article EGUIDE+SAS+Enterprise+Guide
ac Problem Notes for SAS®9 - 65682: Running FedSQL with an Oracle table is slow, even when you use a LIMIT clause By feedproxy.google.com Published On :: Fri, 1 May 2020 14:43:59 EST When you query an Oracle table and use the LIMIT clause using either SAS Federation Server or FedSQL, a row limit is not passed to the database. In this scenario, a Full Article DFFEDSVR+SAS+Federation+Server
