Open Access

ARTICLE

Exosomes derived from circBCRC-3-knockdown mesenchymal stem cells promoted macrophage polarization

QI SONG¹, JUN ZHANG¹, QIANG ZHANG¹, JING LIU¹, KE LV¹, JIALU YAO^1,2,3,*, YAFENG ZHOU^2,3,*

1 Department of Cardiology, Suzhou Municipal Hospital Affiliated to Nanjing Medical University, Suzhou, 215000, China
2 Department of Cardiology, Dushuhu Public Hospital Affiliated to Soochow University, Suzhou, 215000, China
3 Department of Cardiology, The First Affiliated Hospital of Soochow University, Suzhou, 215000, China

* Address correspondence to: Jialu Yao, ; Yafeng Zhou,

BIOCELL 2020, 44(4), 623-629. https://doi.org/10.32604/biocell.2020.012645

Received 08 July 2020; Accepted 25 September 2020; Issue published 24 December 2020

Abstract

Macrophages play an essential role in the myocardial ischemia-reperfusion injury (MIRI), and the macrophage shifting from M1 to M2 phenotypes might be a potential strategy for the treatment of MIRI. It has been reported that miR-182 plays an important role in MSC-Exo-associated macrophage polarization. As circBCRC-3 is a newly discovered circle RNA that worked as a sponge of miR-182, this research aimed to find if circBCRC-3 plays a role in MSC-Exo-associated macrophage polarization. Firstly, circBCRC-3 was identified by divergent primers in mesenchymal stem cells (MSCs). Secondly, the exosome of MSCs was isolated and identified by transmission electron microscopy (TEM), nanoparticle-tracking analysis, and western blotting analysis. The expression level of circBCRC-3 in MSCexos was detected by RT-PCR. Finally, the polarization of the RAW264.7 cell phenotype was analyzed by flow cytometry. Moreover, we first identified circBCRC-3 in MSCs. The results further confirmed that MSCexo could effectively shift the macrophage polarization state from M1 towards the M2 phenotype, which indicated its role in MIRI cure.

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