Zhang D, Yao X, Teng Y, Zhao T, Lin L, Li Y, Shang H, Jin Y, Jin Q. Adipocytes-derived exosomal
microRNA-1224 inhibits M2 macrophage polarization in obesity-induced adipose tissue inflammation via MSI2-mediated Wnt/β-catenin axis.
Mol Nutr Food Res 2022;
66:e2100889. [PMID:
35616318 DOI:
10.1002/mnfr.202100889]
[Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 04/27/2022] [Indexed: 11/06/2022]
Abstract
SCOPE
Phenotypic switch of macrophage polarization in adipose tissue has been associated with obesity-induced adipose tissue inflammation (OATI). Therefore, we aimed to explore the possible mechanism of adipocytes-derived exosomes (ADEs) carrying microRNA-1224 (miR-1224) in M2 macrophage polarization of OATI.
METHODS AND RESULTS
We developed miR-1224-knockout (miR-1224-KO) mice for this study, and isolated primary adipocytes from high-fat diet (HFD) or normal diet (SD)-fed mice. ADEs were extracted and cocultured with bone marrow-derived macrophages (BMDMs). The macrophagic crown-like structures (CLS) and M1 and M2 phenotype macrophages in epididymal white adipose tissue (epiWAT) were observed by immunohistochemistry and flow cytometry. The obtained data indicated that miR-1224 was highly expressed in adipose tissues and adipocytes of obese mice. miR-1224 knockout decreased CLS number and increased M2 macrophages polarization in epiWAT. In addition, miR-1224 could be transferred to BMDMs via ADEs, which targeted musashi RNA binding protein 2 (MSI2) expression and inactivated Wnt/β-catenin pathway, inhibiting macrophage M2 polarization and promoting inflammatory factor release.
CONCLUSION
Exosomal miR-1224 derived by adipocytes targets MSI2 and blocks the Wnt/β-catenin pathway, which inhibits macrophage M2 polarization and promotes inflammatory factor release, ultimately promoting OATI. This article is protected by copyright. All rights reserved.
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