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Microglial uptake of hADSCs-Exo mitigates neuroinflammation in ICH.
Cellular Signalling 2024 March 17
Intracerebral hemorrhage (ICH) is associated with secondary neuroinflammation, leading to severe central nervous system damage. Exosomes derived from human adipose-derived mesenchymal stem cells (hADSCs-Exo) have shown potential therapeutic effects in regulating inflammatory responses in ICH. This study aims to investigate the role of hADSCs-Exo in ICH and its underlying mechanism involving miRNA-mediated regulation of formyl peptide receptor 1 (FPR1). Flow cytometry was used to identify hADSCs and extract exosomes. Transmission electron microscopy and Western blot were performed to confirm the characteristics of the exosomes. In vitro experiments were conducted to explore the uptake of hADSCs-Exo by microglia cells and their impact on inflammatory responses. In vivo, an ICH mouse model was established, and the therapeutic effects of hADSCs-Exo were evaluated through neurological function scoring, histological staining, and immunofluorescence. Bioinformatics tools and experimental validation were employed to identify miRNAs targeting FPR1. hADSCs-Exo were efficiently taken up by microglia cells and exhibited anti-inflammatory effects by suppressing the release of inflammatory factors and promoting M1 to M2 transition. In the ICH mouse model, hADSCs-Exo significantly improved neurological function, reduced hemorrhage volume, decreased neuronal apoptosis, and regulated microglia polarization. miR-342-3p was identified as a potential regulator of FPR1 involved in the neuroprotective effects of hADSCs-Exo in ICH. hADSCs-Exo alleviate neuroinflammation in ICH through miR-342-3p-dependent targeting of FPR1, providing a new therapeutic strategy for ICH.
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