ABSTRACT

Fungal infections are a major contributor to infectious disease-related deaths worldwide. Recently, global emergence of the fungal pathogen Candida auris has caused considerable concern because most C. auris isolates are resistant to fluconazole, the most commonly administered antifungal, and some isolates are resistant to drugs from all three major antifungal classes. To identify novel agents with bioactivity against C. auris, we screened 2,454 compounds from a diversity-oriented synthesis collection. Of the five hits identified, most shared a common rocaglate core structure and displayed fungicidal activity against C. auris. These rocaglate hits inhibited translation in C. auris but not in its pathogenic relative Candida albicans. Species specificity was contingent on variation at a single amino acid residue in Tif1, a fungal member of the eukaryotic initiation factor 4A (eIF4A) family of translation initiation factors known to be targeted by rocaglates. Rocaglate-mediated inhibition of translation in C. auris activated a cell death program characterized by loss of mitochondrial membrane potential, increased caspase-like activity, and disrupted vacuolar homeostasis. In a rocaglate-sensitized C. albicans mutant engineered to express translation initiation factor 1 (Tif1) with the variant amino acid that we had identified in C. auris, translation was inhibited but no programmed cell death phenotypes were observed. This surprising finding suggests divergence between these related fungal pathogens in their pathways of cellular responses to translation inhibition. From a therapeutic perspective, the chemical biology that we have uncovered reveals species-specific vulnerability in C. auris and identifies a promising target for development of new, mechanistically distinct antifungals in the battle against this emerging pathogen.

IMPORTANCE Emergence of the fungal pathogen Candida auris has ignited intrigue and alarm within the medical community and the public at large. This pathogen is unusually resistant to antifungals, threatening to overwhelm current management options. By screening a library of structurally diverse molecules, we found that C. auris is surprisingly sensitive to translation inhibition by a class of compounds known as rocaglates (also known as flavaglines). Despite the high level of conservation across fungi in their protein synthesis machinery, these compounds inhibited translation initiation and activated a cell death program in C. auris but not in its relative Candida albicans. Our findings highlight a surprising divergence across the cell death programs operating in Candida species and underscore the need to understand the specific biology of a pathogen in attempting to develop more-effective treatments against it.

Drivers with blood-alcohol levels below legal limits cause 15% of all crash deaths that involve alcohol, a study in the March issue of the American Journal of Preventive Medicine finds.

Pedestrian fatalities from vehicle impacts in 2019 were the highest in the U.S. in over three decades, a February report finds.

N-terminal (Nt) acetylation (NTA) is an ample and irreversible cotranslational protein modification catalyzed by ribosome-associated Nt-acetyltransferases. NTA on specific proteins can act as a degradation signal (called an Ac/N-degron) for proteolysis in yeast and mammals. However, in plants, the biological relevance of NTA remains largely unexplored. In this study, we reveal that Arabidopsis (Arabidopsis thaliana) SIGMA FACTOR-BINDING PROTEIN1 (SIB1), a transcription coregulator and a positive regulator of salicylic acid-primed cell death, undergoes an absolute NTA on the initiator Met; Nt-acetyltransferase B (NatB) partly contributes to this modification. While NTA results in destabilization of certain target proteins, our genetic and biochemical analyses revealed that plant NatB-involved NTA instead renders SIB1 more stable. Given that the ubiquitin/proteasome system stimulates SIB1 degradation, it seems that the NTA-conferred stability ensures the timely expression of SIB1-dependent genes, mostly related to immune responses. Taking our findings together, here we report a noncanonical NTA-driven protein stabilization in land plants.

A wide variety of intrinsic and extrinsic cues lead to cell death with unclear mechanisms. The infertility of some death mutants often hurdles the classical suppressor screens for death regulators. We have developed a transient RNA interference (RNAi)-based screen using a virus-induced gene silencing approach to understand diverse cell death pathways in Arabidopsis (Arabidopsis thaliana). One death pathway is due to the depletion of a MAP kinase (MAPK) cascade, consisting of MAPK kinase kinase 1 (MEKK1), MKK1/2, and MPK4, which depends on a nucleotide-binding site Leu-rich repeat (NLR) protein SUMM2. Silencing of MEKK1 by virus-induced gene silencing resembles the mekk1 mutant with autoimmunity and defense activation. The RNAi-based screen toward Arabidopsis T-DNA insertion lines identified SUMM2, MEKK2, and Calmodulin-binding receptor-like cytoplasmic kinase 3 (CRCK3) to be vital regulators of RNAi MEKK1-induced cell death, consistent with the reports of their requirement in the mekk1-mkk1/2-mpk4 death pathway. Similar with MEKK2, overexpression of CRCK3 caused dosage- and SUMM2-dependent cell death, and the transcripts of CRCK3 were up-regulated in mekk1, mkk1/2, and mpk4. MEKK2-induced cell death depends on CRCK3. Interestingly, CRCK3-induced cell death also depends on MEKK2, consistent with the biochemical data that MEKK2 complexes with CRCK3. Furthermore, the kinase activity of CRCK3 is essential, whereas the kinase activity of MEKK2 is dispensable, for triggering cell death. Our studies suggest that MEKK2 and CRCK3 exert concerted functions in the control of NLR SUMM2 activation and MEKK2 may play a structural role, rather than function as a kinase, in regulating CRCK3 protein stability.

Programmed death-ligand 1 (PD-L1/B7-H1) serves as a cosignaling molecule in cell-mediated immune responses and contributes to chronicity of inflammation and the escape of tumor cells from immunosurveillance. Here, we investigated the molecular mechanisms leading to PD-L1 upregulation in human oral carcinoma cells and in primary human gingival keratinocytes in response to infection with Porphyromonas gingivalis (P. gingivalis), a keystone pathogen for the development of periodontitis. The bacterial cell wall component peptidoglycan uses bacterial outer membrane vesicles to be taken up by cells. Internalized peptidoglycan triggers cytosolic receptors to induce PD-L1 expression in a myeloid differentiation primary response 88 (Myd88)-independent and receptor-interacting serine/threonine-protein kinase 2 (RIP2)-dependent fashion. Interference with the kinase activity of RIP2 or mitogen-activated protein (MAP) kinases interferes with inducible PD-L1 expression.

Background and objectives

Uromodulin is exclusively produced by tubular epithelial cells and released into urine and serum. Higher serum uromodulin has been associated with lower risk for kidney failure in Chinese patients with CKD and with lower risk for mortality in the elderly and in patients undergoing coronary angiography. We hypothesized that lower serum uromodulin is associated with mortality, cardiovascular events, and kidney failure in white patients with CKD.

Cell death is an invariant feature throughout our life span, starting with extensive scheduled cell death during morphogenesis and continuing with death under homeostasis in adult tissues. Additionally, cells become victims of accidental, unscheduled death following injury and infection. Cell death in each of these occasions triggers specific and specialized responses in the living cells that surround them or are attracted to the dying/dead cells. These responses sculpt tissues during morphogenesis, replenish lost cells in homeostasis to maintain tissue/system function, and repair damaged tissues after injury. Wherein lies the information that sets in motion the cascade of effector responses culminating in remodeling, renewal, or repair? Here, we attempt to provide a framework for thinking about cell death in terms of the specific effector responses that accompanies various modalities of cell death. We also propose an integrated threefold "cell death code" consisting of information intrinsic to the dying/dead cell, the surroundings of the dying cell, and the identity of the responder.

Background:

New technologies are being developed for early detection of multiple types of cancer simultaneously. To quantify the potential benefit, we estimated reductions in absolute cancer–related deaths that could occur if cancers diagnosed after metastasis (stage IV) were instead diagnosed at earlier stages.

A centenarian who tested positive for COVID-19 has become the oldest local resident to die from the virus. The woman in her 100s was a resident of a long-term care or retirement home. She died on Thursday, the Windsor-Essex County Health Unit reported during its end-of-week epidemic data summary on Friday. “I would like to […]

Pandemics of the past can teach us about the current one, says John Troyer, who studies how we use technology to alter the experience of death

Why? Because that’s our reality here in the year 2020.

Campaigns and consultants have spent the last four years worrying about the Trump campaign’s digital operation. Even before COVID-19 upended the election and forced candidates online, the Trump campaign was geofencing campaign rallies, micro-targeting digital ads, and amplifying deepfake videos.

And now, as both the crisis and the general election enter their third month, panic is beginning to set in about the startling digital gap between the two parties, amplified by the recent Trump campaign announcement of both a new app experience and the start of a $10 million digital push against Joe Biden. 

President Trump’s campaign manager has called what he’s built a “juggernaut” and is likening his digital infrastructure to a Death Star. In reality, what he's built is a trap.  

Read more at The Daily Beast.

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People who attended religious services at least once a week were significantly less likely to die from 'deaths of despair,' including deaths related to suicide, drug overdose, and alcohol poisoning, according to new research.

Hollywood loves a good comeback, and post-coronavirus will be no exception, writes costume designer Kristin M Burke

Many events have killed the film industry: the 1918 influenza epidemic, the second world war, the invention of television, the invention of VCRs, the invention of the internet, 9-11, strike after strike after strike. And yet, like a phoenix, it rises, every time stronger than before. The appetite for its product is insatiable especially in times of political trouble and uncertainty about the future. People want to escape. They want to be entertained.

The way we make movies most certainly must change. In the best of circumstances, we are a crew of 75 people jammed into a room with very little ventilation, holding our breath until we hear “CUT”. We are in close contact with one another all day long. We never really thought about it before. All of that is about to change. Film sets usually function as big families, and moving forward, that family unit will take on a stronger, protective meaning. This is how we self-regulate in the post-pandemic era.

The U.S. Centers for Disease Control and Prevention (CDC) on Friday reported 1,248,040 cases of the new coronavirus, an increase of 28,974 cases from its previous count, and said that the number of deaths had risen by 2,180 to 75,477.

The number of deaths from the coronavirus in Mexico's best-known border city, Tijuana, has soared and the COVID-19 mortality rate is twice the national average, the health ministry says, after medical staff quickly fell ill as the outbreak rampaged through hospital wards.

An analysis of the daily steps taken by about 5000 people in the US has found that a higher step count is linked to a lower yearly risk of death, although the effect tails off above 12,000 steps

Despite data pouring in from many countries, estimates of how many of those infected with covid-19 die still vary widely

With all the unknowns about covid-19, any numbers you hear about death tolls or how long restrictions will last should be taken not just with a pinch of salt but with a sack of it

The number of deaths from the coronavirus in Mexico's best-known border city, Tijuana, has soared and the COVID-19 mortality rate is twice the national average, the health ministry says, after medical staff quickly fell ill as the outbreak rampaged through hospital wards.

The death toll from coronavirus in Britain has risen to 31,587, an increase of 346 in a 24-hour period, Transport Minister Grant Shapps said at the government's daily news briefing.

Spain's daily death toll from the coronavirus fell to its second lowest since mid-March on Saturday, as half the country prepared to move to the next phase of an exit from one of Europe's strictest lockdowns.

It was supposed to be a blockbuster moment for the U.S. plastic industry. With an abundance of cheap natural gas at hand, thanks to the country’s fracking boom, U.S. energy giants were pouring billions of dollars into building new plants to turn that gas into plastic. As the world was poised to slowly turn away…

THE UK reached a grim milestone today as the total number of coronavirus deaths is believed to have surpassed 36,000.

GREENSBURG, Pa. (AP) - On a cloudy Friday afternoon 20 years ago Tuesday, an unemployed immigration lawyer went on a killing spree. It started next door to his parents’ Mt. Lebanon home, where he killed his Jewish neighbor. He went on to shoot five more people, all ethnic or racial ...

The NFL Players Coalition and other athletes and coaches called on the Justice Department and the FBI to launch a federal investigation into the shooting death of Ahmaud Arbery in a letter Friday.

A new study has found an association between low average levels of vitamin D and high numbers of COVID-19 cases and mortality rates across 20 European countries.

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Gay rights pioneer Phyllis Lyon has died aged 95.

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Read our live coronavirus updates HERE Health Secretary said his 'heart goes out' to the families of NHS workers killed during outbreak Facing backlash for calling protective equipment for healthcare workers a 'precious resource' Sir Keir Starmer waded into row, calling Mr Hancock's comments 'insulting'

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