期刊
ACTA BIOCHIMICA ET BIOPHYSICA SINICA
卷 53, 期 9, 页码 1227-1236出版社
SCIENCE PRESS
DOI: 10.1093/abbs/gmab102
关键词
exosomes; atherosclerosis; miR-21a-5p; polarization; infiltration
资金
- National Nature Science Foundations of China [81300177, 81770282]
- Natural Science Foundation of Anhui Province
- Anhui Provincial Cardiovascular Institute
- New Medicine of University of Science and Technology of China
- Fundamental Research Funds for the Central Universities [WK9110000046]
The study demonstrated that MSC-derived exosomes promote M2 polarization of macrophages, reduce plaque area, and decrease macrophage infiltration, thereby attenuating the development of atherosclerosis (AS). This effect is achieved by targeting KLF6 and ERK1/2 signaling pathways, offering a promising treatment option for AS.
Atherosclerosis (AS) is the main pathological basis for ischemic cardiovascular and cerebrovascular diseases. Mesenchymal stem cell (MSC)-derived exosomes have the potential to alleviate AS, while the underlying mechanism remains unclear. Here, we aimed to investigate the mechanism of MSC-derived exosomes in AS. The AS mouse model was prepared by feeding ApoE(-/-) mice with high-fat diet. AS mice were administered with MSC-derived exosomes, and the atherosclerotic plaque area was analyzed by Oil Red O staining. Mouse RAW264.7 macrophages were incubated with MSC-derived exosomes. The macrophage infiltration, macrophage proportion, and cell migration were estimated by immunohistochemistry, flow cytometry, or Transwell assay. The relationship between miR-21a-5p and kruppel-like factor 6 (KLF6) or extracellular signal-regulated protein kinases 2 (ERK2) was verified by luciferase reporter assay. We found that MSC-derived exosomes promoted M2 polarization of macrophages and reduced plaque area and macrophage infiltration in AS mice. miR-21a-5p overexpression caused an increase of M2 macrophages in RAW264.7 cells and led to a decrease in migration of RAW264.7 cells. Moreover, both KLF6 and ERK2 are the targets of miR-21a-5p. MSC-derived exosomes containing miR-21a-5p promoted M2 polarization of RAW264.7 cells by suppressing KLF6 expression. MSC-derived exosomes containing miR-21a-5p inhibited migration of RAW264.7 cells through inhibiting the ERK1/2 signaling pathway. In conclusion, MSC-derived exosomes containing miR-21a-5p promote macrophage polarization and reduce macrophage infiltration by targeting KLF6 and ERK1/2 signaling pathways, thereby attenuating the development of AS. Thus, MSC-derived exosomes may be a promising treatment for AS.
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