Neutrophil N1 polarization induced by cardiomyocyte-derived extracellular vesicle miR-9-5p aggravates myocardial ischemia/reperfusion injury.

ABSTRACT: Neutrophil polarization contributes to inflammation and its resolution, but the role of neutrophil polarization in myocardial ischemia/reperfusion (I/R) injury remains unknown. Cardiomyocytes (CMs) participate in cardiac inflammation by secreting extracellular vesicles (EVs). Therefore, we investigated the role of neutrophil polarization in myocardial I/R injury and the mechanism by which CM-derived EVs regulated neutrophil polarization. In the present study, our data showed that N1 neutrophil polarization enlarged cardiac infarct size and exacerbated cardiac dysfunction at the early stage of myocardial I/R. Further, CM-EV-derived miR-9-5p was identified as a mediator inducing neutrophils to the N1 phenotype. Mechanistically, miR-9-5p directly suppressed SOCS5 and SIRT1 expression, resulti

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC11484374 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature