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Endothelial characteristics of cardiac stem cell antigen-1 expressing cells and their relevance to right ventricular adaptation.
Can J Physiol Pharmacol
January 2025
Dalhousie University, Department of Physiology and Biophysics, Halifax, Canada;
A growing body of evidence suggest that the stem cell antigen-1 expressing (Sca-1) cells in the heart may be the cardiac endothelial stem/progenitor cells. Their endothelial cell (EC) functions, and their role in RV physiology and pathophysiology of right heart failure (RHF) remains poorly defined. This study investigated EC characteristics of rat cardiac Sca-1 cells, assessed spatial distribution and studied changes in Sca1 cells during RV remodelling in monocrotaline (MCT) model of pulmonary hypertension and RV remodeling.
View Article and Find Full Text PDFFunctional classification of tauopathy strains reveals the role of protofilament core residues.
Sci Adv
January 2025
Center for Alzheimer's and Neurodegenerative Diseases, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX, USA.
Distinct tau amyloid assemblies underlie diverse tauopathies but defy rapid classification. Cell and animal experiments indicate tau functions as a prion, as different strains propagated in cells cause unique, transmissible neuropathology after inoculation. Strain amplification requires compatibility of the monomer and amyloid template.
View Article and Find Full Text PDFMitochondria complex III-generated superoxide is essential for IL-10 secretion in macrophages.
Sci Adv
January 2025
Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.
Mitochondrial electron transport chain (ETC) function modulates macrophage biology; however, mechanisms underlying mitochondria ETC control of macrophage immune responses are not fully understood. Here, we report that mutant mice with mitochondria ETC complex III (CIII)-deficient macrophages exhibit increased susceptibility to influenza A virus (IAV) and LPS-induced endotoxic shock. Cultured bone marrow-derived macrophages (BMDMs) isolated from these mitochondria CIII-deficient mice released less IL-10 than controls following TLR3 or TLR4 stimulation.
View Article and Find Full Text PDFElucidating assembly and function of VirB8 cell wall subunits refines the DNA translocation model in Gram-positive T4SSs.
Sci Adv
January 2025
Université de Lorraine, INRAE, DynAMic, F-54000 Nancy, France.
Bacterial type IV secretion systems (T4SSs) are widespread nanomachines specialized in the transport across the cell envelope of various types of molecules including mobile genetic elements during conjugation. Despite their prevalence in Gram-positive bacteria, including relevant pathogens, their assembly and functioning remain unknown. This study addresses these gaps by investigating VirB8 proteins, known to be central components of conjugative T4SSs in Gram-positive bacteria.
View Article and Find Full Text PDFPrefrontal 5α-reductase 2 mediates male-specific acute stress response.
Sci Adv
January 2025
Department of Pharmacology and Toxicology, College of Pharmacy, University of Utah, Salt Lake City, UT, USA.
A key response to acute stress is the increased brain synthesis of the neurosteroid allopregnanolone (AP). Although the rate-limiting step of this reaction is catalyzed by 5α-reductase (5αR), the role of its two primary isoenzymes, 5αR1 and 5αR2, in stress reactivity remains unclear. Here, we found that acute stress led to increased levels of 5αR2, but not 5αR1, in the medial prefrontal cortex (mPFC) of male, but not female, rats.
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