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The enzyme ABHD18 is shown to have a key role in cardiolipin metabolism in mitochondria, offering a potential route for a small-molecule treatment of the rare genetic disease Barth syndrome.

In this work, a library of several hundred million compounds was computationally docked to a cryoEM structure of the orphan G protein-coupled receptor GPR139, leading to the discovery of a potent agonist with in vivo effects and insights into GPR139 signalling.

In this study, the authors show that autophagy controls blood cell differentiation in a Drosophila model of hematopoiesis. Notch activation depends on the endocytic pathway and promotes crystal cell differentiation, while autophagy reduces Notch accumulation via lysosomal destruction in a nutrient-dependent manner.

Reduced placental angiogenesis is suspected to cause preeclampsia. Using placental in vitro models and an in vivo model, the authors uncover the key role of an amino acid transporter and related molecular interactions that together induce an anti-angiogenic state, as observed in preeclampsia.

Here, combining structural, proteomics and biochemical analyses, the authors elucidate how the keystone gut bacterium Ruminococcus bromii assembles a specialized enzyme complex, the amylosome, to efficiently break down resistant starch, a cardinal dietary fiber that influences gut microbiome function and health.

Targeting FSP1 in lymph nodes has considerable potential for blocking melanoma progression.

The mechanisms involved in programmed or damage-induced removal of mitochondria by mitophagy remain elusive. Here the authors use an siRNA library to screen lipid-binding proteins, and identify the kinases GAK and PRKCD as positive regulators of PRKN-independent mitophagy.

Many animals change color to hide from predators or attract mates, but how this flexibility is controlled is unclear. Here, the authors show that African cichlid fish change color by modulating gene activity through DNA methylation, revealing an epigenetic switch for body color plasticity.

Mondal et al. report that autophagy inhibition promotes p63 activation and metastasis in breast cancer. This process depends on NBR1, which forms cytoplasmic p62/SQSTM1 condensates that sequester the ITCH ubiquitin ligase and prevents p63 degradation.

Multiomic factor analysis of blood multiomic data, including single-cell transcriptomics, for individuals with either acute or chronic coronary syndrome identifies immune cell signatures that correlate with treatment outcomes.

Cap-independently translated mRNAs could expand the scope of mRNA therapies, but yield limited protein, and existing enhancement strategies are imperfect. Here, the authors install a 5′-end modification that both boosts efficiency and facilitates in-depth characterisation of these mRNAs.

Using genome-resolved metagenomics for 41 Arctic seawater samples, this ecogenomic analysis of 530 metagenome-assembled genomes (MAGs) from the polar Arctic Ocean reveals uncultured Arctic bacterial and archaeal MAGs, their gene expression patterns, habitat preferences and metabolic potential.

Here, the authors elongated the hinge structure of IgG1 monoclonal antibodies. The modified IgG1-IgG3 hybrid subclass showed enhanced Fc-mediated function compared to IgG1 in two distinct biological systems, Streptococcus pyogenes and SARS-CoV-2.

Prostaglandin E2 from the tumour microenvironment impairs interleukin-2 sensing by tumour-infiltrating lymphocytes, restricting proliferative response and promoting T cell death via metabolic impairment and ferroptosis. 

Subunits of the Elongator complex have been implicated in several nervous system pathologies. Here, the authors identify ELP2 variants in six patients with neurodevelopmental anomalies and show in mouse models that these variants impact protein stability and the activity of the complex during brain development.

Steroid-refractory acute graft-versus-host disease (aGVHD) is associated with a low one-year survival rate. Here, the authors show that ROCK1 is upregulated in leukocytes from patients with steroid-refractory aGVHD and that ROCK1/2 inhibition reduces the severity of aGVHD in mice by interfering with activation of multiple immune cell types.

A key source of mitochondrial DNA mutations is errors introduced during genome replication. Here the authors create Drosophiliastrains with separated elongation and proofreading capabilities to explore the dynamism of mitochondrial DNA replication.

Here the authors determined several cryo-EM structures of the human Elongator complex, which modifies anticodons of tRNAs. The structural work is complemented by functional analyses to understand this clinically relevant cellular machine at the molecular level.

The Apelin receptor (APLNR) plays a key role during cardiovascular development. Here, authors develop genetically encoded APLNR conformation biosensors, which enable the measurement of temporally and spatially resolved APLNR activity in model cell lines and living organisms.

Preclinical studies indicate that myeloproliferative neoplasms (MPN) may be sensitive to the estrogen receptor modulator, tamoxifen. Here, the authors present a phase II clinical trial reporting the efficacy of tamoxifen in MPN and analysis of peripheral haematopoietic stem cells to identify potential predictive signatures of responders.

Pocock et al. reveal that transient activation of 5′ AMP-activated protein kinase and estrogen-related receptor drives robust maturation of multicellular human cardiac organoids, enabling modeling of desmoplakin cardiomyopathy dysfunction, which could be rescued using the bromodomain and extra-terminal inhibitor INCB054329.

The functions of specific lipids in autophagosome biogenesis are not entirely clear. Here, the authors show that the ER protein GRAMD1C, a cholesterol transport protein, suppresses autophagy initiation and has roles in mitochondrial cholesterol homeostasis and respiration.

This work uses gene expression and single cell analyses to group extrapulmonary tuberculosis patients into three immune types, revealing immune pathways driving pathogenesis and markers that could improve diagnosis and guide tailored treatments.

Tumour-derived prostaglandin E₂, signaling through its receptors EP₂ and EP₄, is shown to restrain the responses of tumour-infiltrating stem-like TCF1⁺CD8⁺ T lymphocytes, and modulation of T cell EP₂ and EP₄ can restore anticancer immunity.

Metabolic pathways are closely intertwined with longevity. Here the authors perform metabolomic profiling of canonical longevity pathways and show that folate and methionine cycle intermediates are changed in common, and further, genetic manipulation of pathway enzymes and supplementation with metabolites indicates that they causally regulate longevity.

A chemical screen identified BET bromodomain inhibitors as promoters of keratinocyte regenerative function and skin wound healing. Specifically, low-dose transient treatment with BET inhibitors imposes an activated, migratory state in keratinocytes.

TNF is typically viewed as an inflammatory mediator. Here the authors identify a non-inflammatory mechanism conserved across species whereby the constitutively expressed smooth muscle cell TNF mediates myogenic signal transduction in skeletal muscle resistance arteries and regulates mean arterial blood pressure.

Here, the authors show that physiological alpha-synuclein supports mitochondrial ATP homeostasis via interactions with ATP synthase and AK2, whereas its disease-linked mutants, truncated forms, and aggregates lose these interactions.

Currently available platforms to study liver stage of Plasmodium species have limitations. Here, the authors show that primary human hepatocyte cultures in 384-well format support hypnozoite and other liver stage development and are suitable for drug and antibody screens.

van Lengerich et al. developed a human TREM2 antibody with a transport vehicle (ATV) that improves brain exposure and biodistribution in mouse models. ATV:TREM2 promotes microglial energetic capacity and metabolism via mitochondrial pathways.

Influenza A virus replication relies on host cell-derived ubiquitination of the viral polymerase. Here, Günl et al. show that site-specific ubiquitination of PB1-K578 is acquired during infection and facilitates spatiotemporal control of polymerase dimerization and NP binding.

The mechanism whereby activation of G protein–coupled receptors (GPCRs) increase the production of amyloid-β (Aβ) peptide remains unclear. Here Bart De Strooper and colleagues show that the GPCR adaptor protein β-arrestin 2 promotes Aβ production by associating with APH-1A and increasing γ-secretase activity. Overexpression of β-arrestin 2 increases Aβ generation, whereas mice lacking β-arrestin 2 have reduced amyloid accumulation. Moreover, expression of β-arrestin 2 is elevated in individuals with Alzheimer's disease, suggesting a potential therapeutic target aimed at reducing amyloid production.

Plasmacytoid dendritic cells monitor the bone marrow for apoptotic megakaryocytes (MKs) and deliver IFNα to the MK niche, triggering local on-demand proliferation and maturation of MK progenitors.

Drug resistance to current antimalarials is rising and new drugs and targets are urgently needed. Here the authors identify Plasmodium falciparum acyl-CoA synthetase 10 as a new target whose inhibition leads to a decrease in triacylglycerols.

Rifaximin use, particularly in patients with liver cirrhosis, may be compromising the clinical use of daptomycin.

A deep learning model trained on multiple tumor immune cell stainings from patients with colorectal cancer outperforms currently used clinical and single tumor immune cell staining-based parameters in predicting prognosis. The model can also predict the response to neoadjuvant therapy.

Biochemical and lipidomic analyses identify an anti-ferroptotic function of vitamin K and reveal ferroptosis suppressor protein 1 (FSP1) as the enzyme mediating warfarin-resistant vitamin K reduction in the canonical vitamin K cycle.

REEP domain-containing proteins generate membrane curvature, and some are known to shape the endoplasmic reticulum (ER). Here, the authors show that four understudied members, REEPs 1-4, localize to vesicles that appear to bud out of, and fuse back with, ER.

The clinical success of anti- αEβ7 antibody Etrolizumab for Crohn’s disease is less than what is expected based on proof-of-concept studies. Here authors show, by characterization of T cells from Etrolizumab-treated patients, in vitro functional assays and reanalysis of public single cell datasets on Etrolizumab-treated patients, that at high level of T cell activation, which characterises T cells in Crohn’s disease, E-Cadherin-αEβ7 interactions become resistant to Etrolizumab inhibition.

In a large cohort of patients who underwent aortic valve replacement, antibody responses to glycans present in bioprosthetic heart valves, notably galactose-α1,3-galactose and N-glycolylneuraminic acid, were implicated in valve calcification and deterioration.

Guetter et al. identify a melanoma-associated chondroitin sulfate proteoglycan-positive subpopulation of metastasis founder cells from lymph node biopsies of patients with melanoma and observe that they mediate immune evasion and predict systemic metastasis and poor outcomes.

Loss of Trem2 function increases early amyloidogenesis by preventing microglial activation and clustering around amyloid seeds. As a consequence of reduced microglial ApoE production in the absence of Trem2 function, amyloid plaques contain less ApoE.

A screen of the ReFRAME library of approximately 12,000 known drugs for antiviral activity against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) identified several candidate compounds with suitable activities and pharmacological profiles, which could potentially expedite the deployment of therapies for coronavirus disease 2019 (COVID-19).

Fungal infections are severely underestimated as a cause of mortality, and alternative drugs are urgently needed. Here, Schaefer et al. show that a synthetic polymer mimicking defensins shows different, but synergistic activity with known antifungals.

In this work, Otter et al. compared the humoral immune responses induced by MPXV infection and Smallpox vaccination. Although comparable responses were observed, infection- or vaccination specific serological markers were identified enabling discrimination between vaccinated and infected individuals.

GDF15 treatment in mice counteracts compensatory reductions in energy expenditure, resulting in greater weight loss and reductions in non-alcoholic fatty liver disease compared to caloric restriction alone.

The contribution of cell-extrinsic factors during cellular reprogramming to human induced pluripotent stem cells has long been overlooked. Here, the authors show functional protein communication between reprogramming intermediates and the re-shaping of a permissive extracellular environment.

Here the authors show that high expression of MCT11 is key to the dysfunctionality associated with exhausted CD8⁺ T cells in tumors. By targeting MCT11, uptake of lactic acid, which is abundant in the tumor, is reduced, resulting in improved effector functions and tumor immunity.