Martin Prescher
Dec 1, 2020; 61:1605-1616
Research Articles

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ABCB4/MDR3 is located in the canalicular membrane of hepatocytes and translocates PC-lipids from the cytoplasmic to the extracellular leaflet. ABCB4 is an ATP-dependent transporter that reduces the harsh detergent effect of the bile salts by counteracting self-digestion. To do so, ABCB4 provides PC lipids for extraction into bile. PC lipids account for 40% of the entire pool of lipids in the canalicular membrane with an unknown distribution over both leaflets. Extracted PC lipids end up in so-called mixed micelles. Mixed micelles are composed of phospholipids, bile salts, and cholesterol. Ninety to ninety-five percent of the phospholipids are members of the PC family, but only a subset of mainly 16.0-18:1 PC and 16:0-18:2 PC variants are present. To elucidate whether ABCB4 is the key discriminator in this enrichment of specific PC lipids, we used in vitro studies to identify crucial determinants in substrate selection. We demonstrate that PC-lipid moieties alone are insufficient for stimulating ABCB4 ATPase activity, and that at least two acyl chains and the backbone itself are required for a productive interaction. The nature of the fatty acids, like length or saturation has a quantitative impact on the ATPase activity. Our data demonstrate a two-step enrichment and protective function of ABCB4 to mitigate the harsh detergent effect of the bile salts, because ABCB4 can translocate more than just the PC-lipid variants found in bile.

The plasma membrane of a cell is characterized by an asymmetric distribution of lipid species across the exofacial and cytofacial aspects of the bilayer. Regulation of membrane asymmetry is a fundamental characteristic of membrane biology and is crucial for signal transduction, vesicle transport, and cell division. The type IV family of P-ATPases, or P4-ATPases, establishes membrane asymmetry by selection and transfer of a subset of membrane lipids from the lumenal or exofacial leaflet to the cytofacial aspect of the bilayer. It is unclear how P4-ATPases sort through the spectrum of membrane lipids to identify their desired substrate(s) and how the membrane environment modulates this activity. Therefore, we tested how the yeast plasma membrane P4-ATPase, Dnf2, responds to changes in membrane composition induced by perturbation of endogenous lipid biosynthetic pathways or exogenous application of lipid. The primary substrates of Dnf2 are glucosylceramide (GlcCer) and phosphatidylcholine (PC, or their lyso-lipid derivatives), and we find that these substrates compete with each other for transport. Acutely inhibiting sphingolipid synthesis using myriocin attenuates transport of exogenously applied GlcCer without perturbing PC transport. Deletion of genes controlling later steps of glycosphingolipid production also perturb GlcCer transport to a greater extent than PC transport. In contrast, perturbation of ergosterol biosynthesis reduces PC and GlcCer transport equivalently. Surprisingly, application of lipids that are poor transport substrates differentially affects PC and GlcCer transport by Dnf2, thus altering substrate preference. Our data indicate that Dnf2 exhibits exquisite sensitivity to the membrane composition, thus providing feedback onto the function of the P4-ATPases.

AAA+ ATPases constitute a large family of proteins that are involved in a plethora of cellular processes including DNA disassembly, protein degradation and protein complex disassembly. They typically form a hexametric ring-shaped structure with six subunits in a (pseudo) 6-fold symmetry. In a subset of AAA+ ATPases that facilitate protein unfolding and degradation, six subunits cooperate to translocate protein substrates through a central pore in the ring. The number and type of nucleotides in an AAA+ ATPase hexamer is inherently linked to the mechanism that underlies cooperation among subunits and couples ATP hydrolysis with substrate translocation. We conducted a native MS study of a monodispersed form of PAN, an archaeal proteasome AAA+ ATPase, to determine the number of nucleotides bound to each hexamer of the WT protein. We utilized ADP and its analogs (TNP-ADP and mant-ADP), and a nonhydrolyzable ATP analog (AMP-PNP) to study nucleotide site occupancy within the PAN hexamer in ADP- and ATP-binding states, respectively. Throughout all experiments we used a Walker A mutant (PAN^K217A) that is impaired in nucleotide binding as an internal standard to mitigate the effects of residual solvation on mass measurement accuracy and to serve as a reference protein to control for nonspecific nucleotide binding. This approach led to the unambiguous finding that a WT PAN hexamer carried – from expression host – six tightly bound ADP molecules that could be exchanged for ADP and ATP analogs. Although the Walker A mutant did not bind ADP analogs, it did bind AMP-PNP, albeit at multiple stoichiometries. We observed variable levels of hexamer dissociation and an appearance of multimeric species with the over-charged molecular ion distributions across repeated experiments. We posit that these phenomena originated during ESI process at the final stages of ESI droplet evolution.

"It has become clear over time that [the edTPA] caused unintended barriers and burdens for teachers entering the profession," Georgia's state superintendent said.

Tired of waiting to catch your flight? Then strap on your very own jetpack and off you go!

"It has become clear over time that [the edTPA] caused unintended barriers and burdens for teachers entering the profession," Georgia's state superintendent said.

Palworld developer Pocketpair has shared details from the patent infringement lawsuit brought against it by Nintendo and The Pokémon Company in September, shedding light on the plaintiffs’ demands. The two companies are seeking an injunction on Palworld, a survival game with monsters that bear alleged similarities to the creatures from the Pokémon franchise.

Shalini Passi became an overnight sensation after featuring in the Netflix reality show Fabulous Lives vs Bollywood Wives

NEW CASTLE (June 16, 2023) – The Delaware Department of Health and Social Services’ Division of Medicaid and Medical Assistance announces that it has extended Medicaid postpartum health care coverage from 60 days to 12 months after the end of a pregnancy. This expansion is made possible through a State Plan Amendment approved by the Centers […]

Title: Seniors More Likely to Wind Up in Hospital After Outpatient Surgery: Study
Category: Health News
Created: 8/25/2015 12:00:00 AM
Last Editorial Review: 8/26/2015 12:00:00 AM

Title: Family History of Mental Illness Ups Odds for Postpartum Depression
Category: Health News
Created: 8/22/2022 12:00:00 AM
Last Editorial Review: 8/23/2022 12:00:00 AM

Title: Postpartum Depression Can Hit Both Mom & Dad, Sometimes at Same Time
Category: Health News
Created: 6/27/2022 12:00:00 AM
Last Editorial Review: 6/28/2022 12:00:00 AM

Background:

Screening rates for Human Immunodeficiency Virus (HIV) remain low despite guidelines by both the CDC and USPSTF recommending that all adolescents and adults be screened at least once. The aim of this quality improvement study was to increase HIV screening among eligible patients.

The antitumor effect of cardiotonic steroids (CTS) has stimulated the search for new methods to evaluate both kinetic and thermodynamic aspects of their binding to Na⁺/K⁺-ATPase (IUBMB Enzyme Nomenclature). We propose a real-time assay based on a chromogenic substrate for phosphatase activity (pNPPase activity), using only two concentrations with an inhibitory progression curve, to obtain the association rate (k_on), dissociation rate (k_off), and equilibrium (K_i) constants of CTS for the structure-kinetics relationship in drug screening. We show that changing conditions (from ATPase to pNPPase activity) resulted in an increase of K_i of the cardenolides digitoxigenin, essentially due to a reduction of k_on. In contrast, the K_i of the structurally related bufadienolide bufalin increased much less due to the reduction of its k_off partially compensating the decrease of its k_on. When evaluating the kinetics of 15 natural and semisynthetic CTS, we observed that both k_on and k_off correlated with K_i (Spearman test), suggesting that differences in potency depend on variations of both k_on and k_off. A rhamnose in C3 of the steroidal nucleus enhanced the inhibitory potency by a reduction of k_off rather than an increase of k_on. Raising the temperature did not alter the k_off of digitoxin, generating a H (k_off) of –10.4 ± 4.3 kJ/mol, suggesting a complex dissociation mechanism. Based on a simple and inexpensive methodology, we determined the values of k_on, k_off, and K_i of the CTS and provided original kinetics and thermodynamics differences between CTS that could help the design of new compounds.

ABSTRACTIntroduction:Postpartum hemorrhage (PPH) remains the leading cause of maternal mortality. A new clinical intervention (E-MOTIVE) holds the potential to improve early PPH detection and management. We aimed to develop and pilot implementation strategies to support uptake of this intervention in Kenya, Nigeria, South Africa, and Tanzania.Methods:Implementation strategy development: We triangulated findings from qualitative interviews, surveys and a qualitative evidence synthesis to identify current PPH care practices and influences on future intervention implementation. We mapped influences using implementation science frameworks to identify candidate implementation strategies before presenting these at stakeholder consultation and design workshops to discuss feasibility, acceptability, and local adaptations. Piloting: The intervention and implementation strategies were piloted in 12 health facilities (3 per country) over 3 months. Interviews (n=58), case report forms (n=1,269), and direct observations (18 vaginal births, 7 PPHs) were used to assess feasibility, acceptability, and fidelity.Results:Implementation strategy development: Key influences included shortages of drugs, supplies, and staff, limited in-service training, and perceived benefits of the intervention (e.g., more accurate PPH detection and reduced PPH mortality). Proposed implementation strategies included a PPH trolley, on-site simulation-based training, champions, and audit and feedback. Country-specific adaptations included merging the E-MOTIVE intervention with national maternal health trainings, adapting local PPH protocols, and PPH trollies depending on staff needs. Piloting: Intervention and implementation strategy fidelity differed within and across countries. Calibrated drapes resulted in earlier and more accurate PPH detection but were not consistently used at the start. Implementation strategies were feasible to deliver; however, some instances of limited use were observed (e.g., PPH trolley and skills practice after training).Conclusion:Systematic intervention development, piloting, and process evaluation helped identify initial challenges related to intervention fidelity, which were addressed ahead of a larger-scale effectiveness evaluation. This has helped maximize the internal validity of the trial.

Nintendo and The Pokémon Company in September filed a patent infringement lawsuit against Palworld developer Pocketpair. 

At the time Nintendo did not share which patents Palworld infringed on, however, Pocketpair has now revealed what patents Nintendo are claiming were infringed on.

"As announced on September 19, 2024, The Pokémon Company and Nintendo Co Ltd (hereinafter referred to as the Plaintiffs) have filed a patent infringement lawsuit against us," said Pocketpair. "We have received inquiries from various media outlets regarding the status of the lawsuit, and we would like to report the details and current status of this case as follows.

"The Plaintiffs claim that Palworld, released by us on January 19, 2024, infringes upon the following three patents held by the Plaintiffs, and are seeking an injunction against the game and compensation for a portion of the damages incurred between the date of registration of the patents and the date of filing of this lawsuit."

Nintendo and The Pokémon Company are each seeking an injunction and damages of five million yen plus late payment damages.

Pocketpair added, "We will continue to assert our position in this case through future legal proceedings. Please note that we will refrain from responding individually to inquiries regarding this case. If any matters arise that require public notice, we will announce them on our website, etc."

A life-long and avid gamer, William D'Angelo was first introduced to VGChartz in 2007. After years of supporting the site, he was brought on in 2010 as a junior analyst, working his way up to lead analyst in 2012 and taking over the hardware estimates in 2017. He has expanded his involvement in the gaming community by producing content on his own YouTube channel and Twitch channel. You can contact the author on Twitter @TrunksWD.

Full Article - https://www.vgchartz.com/article/463022/nintendo-and-the-pokemon-company-seeking-injunction-and-damages-from-pocketpair/

Palworld developers Pocketpair have finally revealed which patents Nintendo and the Pokémon Company are suing them about. It looks like they're focusing on the act of throwing capsular items to catch or release monsters, together with the usage of monsters as mounts.

If you've somehow yet to encounter Palworld, it's a bestselling survival game that takes hefty - some would say, scandalous - inspiration from Pokémon, with players poaching Pokésque critters using magic spheres, and deploying them as soldiers and minions.

Read more

Between 1999 and 2014, opioid use disorder (OUD) among pregnant women more than quadrupled, risking the health of the women—before and after giving birth—and their infants. As states grapple with COVID-19’s exacerbation of the opioid crisis, several are taking innovative steps to address the needs of high-risk groups, including low-income, postpartum patients with OUD.

Highlights: Exercise for a total of 80 minutes per week can reduce postpartum depression and anxiety Physical ac

Approximately 80% of women experience "medlinkbaby blues/medlink" after giving birth, which is a brief period of feeling down. However, about one

While poor sleep is common during and after pregnancy, Canadian researchers suggest cognitive behavioral therapy for insomnia (CBTi) as an effective solution.

Alarmingly high medlinkmaternal mortality rate/medlink in the United States compared to other wealthy nations. The research, conducted by Drexel University,

New dads or fathers-to-be can suffer from medlinkpostpartum depression/medlink which can have adverse effects on their partners' health. Given how

Exercise can effectively reduce postpartum depression and anxiety. It can be an effective alternative to medication for maternal mental health.

Lupin has bolstered its portfolio by introducing the generic Methergine brand into the US markets. Methergine (methylergonovine maleate) tablets are used

In states that expanded Medicaid, a 17% reduction in hospitalizations during the first 60 days postpartum was observed. The study also revealed some

India's fast-moving consumer goods (FMCG) sector grew 5.7 per cent by value and 4.1 per cent by volume in the July-September quarter driven by rural demand which grew faster than urban markets for the third consecutive quarter, according to the latest report by consumer intelligence firm NielsenIQ.

MatPat, the semi-retired YouTube host of The Game of Theorists, joins WIRED to answer his most searched questions from Google. What are his favorite video games? What's he up to in "retirement?" Will he ever come back to YouTube? It's MatPat's WIRED Autocomplete Interview.Director: Jackie PhillipsDirector of Photography: Ricardo PomaresEditor: Louville MooreTalent: MatPatCreative Producer: Justin WolfsonLine Producer: Joseph BuscemiAssociate Producer: Paul GulyasProduction Manager: Peter BrunetteCamera Operator: Shay Eberle-GunstSound Mixer: Kari BarberProduction Assistant: Brock SpitaelsPost Production Supervisor: Christian OlguinPost Production Coordinator: Ian BryantSupervising Editor: Doug LarsenAssistant Editor: Justin Symonds

Kandla port is looking to offer three oil jetties and a couple of cargo jetties to private players under the PPP mode

The list of top 10 investment banks this year includes only one foreign entity.

The removal of the footpaths will help increase the width of the carriageway at points where lanes on either side of the median will be barricaded

This is an exploit for the chunked encoding buffer overflow described in MS03-051 and originally reported by Brett Moore. This particular modules works against versions of Windows 2000 between SP0 and SP3. Service Pack 4 fixes the issue.

This is an exploit for the chunked encoding buffer overflow described in MS03-051 and originally reported by Brett Moore. This particular modules works against versions of Windows 2000 between SP0 and SP3. Service Pack 4 fixes the issue.

The meatpacking industry has slowed down due to the coronavirus outbreaks at the plants. Meatpackers warn that it could lead to meat shortages and stores limiting purchases.

She is fair, light-eyed and the perfect clothes horse. But on days when regular modelling assignments dry up, she doesn't mind changing 50 outfits and being photographed in a small studio against a plain white backdrop. Front, side, and back and you are done, says Anushree, 24, a Mumbai model.

Osiris Martinez-Guzman, Mathilda M. Willoughby, Arushi Saini, Jonathan V. Dietz, Iryna Bohovych, Amy E. Medlock, Oleh Khalimonchuk, and Amit R. Reddi

Heme is a cofactor and signaling molecule that is essential for much of aerobic life. All heme-dependent processes in eukaryotes require that heme is trafficked from its site of synthesis in the mitochondria to hemoproteins located throughout the cell. However, the mechanisms governing the mobilization of heme out of the mitochondria, and the spatio-temporal dynamics of these processes, are poorly understood. Herein, using genetically encoded fluorescent heme sensors, we developed a live cell assay to monitor heme distribution dynamics between the mitochondrial inner-membrane, where heme is synthesized, and the mitochondrial matrix, cytosol, and nucleus. Surprisingly, heme trafficking to the nucleus is ~25% faster than to the cytosol or mitochondrial matrix, which are nearly identical, potentially supporting a role for heme as a mitochondrial-nuclear retrograde signal. Moreover, we discovered that the heme synthetic enzyme, 5-aminolevulinic acid synthase (ALAS), and GTPases in control of the mitochondrial dynamics machinery, Mgm1 and Dnm1, and ER contact sites, Gem1, regulate the flow of heme between the mitochondria and nucleus. Overall, our results indicate that there are parallel pathways for the distribution of bioavailable heme.

Kristina Drizyte-Miller, Jing Chen, Hong Cao, Micah B. Schott, and Mark A. McNiven

Epithelial cells such as liver-resident hepatocytes rely heavily on the Rab family of small GTPases to perform membrane trafficking events that dictate cell physiology and metabolism. Not surprisingly, disruption of several Rabs can manifest in metabolic diseases or cancer. Rab32 is expressed in many secretory epithelial cells but its role in cellular metabolism is virtually unknown. In this study, we find that Rab32 associates with lysosomes and regulates proliferation and cell size of Hep3B hepatoma and HeLa cells. Specifically, we identify that Rab32 supports mTORC1 signaling under basal and amino acid stimulated conditions. Consistent with inhibited mTORC1, an increase in nuclear TFEB localization and lysosome biogenesis is also observed in Rab32-depleted cells. Finally, we find that Rab32 interacts with mTOR kinase and that loss of Rab32 reduces the association of mTOR and mTORC1 pathway proteins with lysosomes, suggesting that Rab32 regulates lysosomal mTOR trafficking. In summary, these findings suggest that Rab32 functions as a novel regulator of cellular metabolism through supporting mTORC1 signaling.

Kristina Drizyte-Miller
Apr 15, 2020; 0:jcs.236661v1-jcs.236661
Articles

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Environmentally-friendly practices aren't just for new buildings anymore. Their existing – and, in some cases, elderly – counterparts are catching on, too.

Maria Sparagis and her team have built a strong reputation as specialists in card-not-present payments and high-risk merchant acquiring in Canada, the US and Europe.