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Neutrophil adhesion to vessel walls impairs pulmonary circulation in COVID-19 pathology.
Nat Commun
January 2025
Division of Virology, Institute of Medical Science, University of Tokyo, Tokyo, Japan.
Microthrombus formation is associated with COVID-19 severity; however, the detailed mechanism remains unclear. In this study, we investigated mouse models with severe pneumonia caused by SARS-CoV-2 infection by using our in vivo two-photon imaging system. In the lungs of SARS-CoV-2-infected mice, increased expression of adhesion molecules in intravascular neutrophils prolonged adhesion time to the vessel wall, resulting in platelet aggregation and impaired lung perfusion.
View Article and Find Full Text PDFSepsis-induced NET formation requires MYD88 but is independent of GSDMD and PAD4.
FASEB J
January 2025
Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
Neutrophils are peripheral blood-circulating leukocytes that play a pivotal role in host defense against bacterial pathogens which upon activation, they release web-like chromatin structures called neutrophil extracellular traps (NETs). Here, we analyzed and compared the importance of myeloid differentiation factor 88 (MYD88), peptidyl arginine deiminase 4 (PAD4), and gasdermin D (GSDMD) for NET formation in vivo following sepsis and neutrophilia challenge. Injection of lipopolysaccharide (LPS)/E.
View Article and Find Full Text PDFCirculating biomarkers associated with pediatric sickle cell disease.
Front Mol Biosci
December 2024
Department of Microbiology, Biochemistry and Immunology, Morehouse School of Medicine, Atlanta, GA, United States.
Article Synopsis
- Sickle cell disease (SCD) is a genetic disorder caused by a mutation in the HBB gene, resulting in abnormal hemoglobin S that deforms red blood cells, leading to severe health complications such as pain, anemia, and organ damage.
- The disease is prevalent, especially in sub-Saharan Africa, where over 7.5 million people are affected, often facing underdiagnosis and poor management, particularly in children.
- This study in Ghana aims to identify specific circulating biomarkers in pediatric SCD patients that could help predict disease outcomes and improve patient care by assessing various serum markers associated with inflammation and neuronal injury.
Deep profiling deconstructs features associated with memory CD8 T cell tissue residence.
Immunity
January 2025
Department of Microbiology and Immunology, University of Minnesota, Minneapolis, MN 55455, USA; Center for Immunology, University of Minnesota, Minneapolis, MN 55455, USA. Electronic address:
Tissue-resident memory CD8 T (Trm) cells control infections and cancer and are defined by their lack of recirculation. Because migration is difficult to assess, residence is usually inferred by putative residence-defining phenotypic and gene signature proxies. We assessed the validity and universality of residence proxies by integrating mouse parabiosis, multi-organ sampling, intravascular staining, acute and chronic infection models, dirty mice, and single-cell multi-omics.
View Article and Find Full Text PDFBalancing immune response: SHP1 controls neutrophil activation in inflamed lungs.
J Clin Invest
December 2024
Following respiratory infection or injury, neutrophil hyperactivation can damage surrounding lung tissue by releasing harmful compounds. In this issue of the JCI, Moussavi-Harami and colleagues identified tyrosine phosphatase SHP1 as a key negative regulator of neutrophil activation in acute respiratory distress syndrome (ARDS). Neutrophil-specific Shp1 disruption leads to hyperinflammation, pulmonary hemorrhage, and increased mortality in both sterile and pathogen-induced acute lung injury (ALI).
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