Abstract
The transdifferentiation from cardiac fibroblasts to myofibroblasts is an important event in the initiation of cardiac fibrosis. However, the underlying mechanism is not fully understood. Circ-sh3rf3 (circular RNA SH3 domain containing Ring Finger 3) is a novel circular RNA which was induced in hypertrophied ventricles by isoproterenol hydrochloride, and our work has established that it is a potential regulator in cardiac hypertrophy, but whether circ-sh3rf3 plays a role in cardiac fibrosis remains unclear, especially in the conversion of cardiac fibroblasts into myofibroblasts. Here, we found that circ-sh3rf3 was down-regulated in isoproterenol-treated rat cardiac fibroblasts and cardiomyocytes as well as during fibroblast differentiation into myofibroblasts. We further confirmed that circ-sh3rf3 could interact with GATA-4 proteins and reduce the expression of GATA-4, which in turn abolishes GATA-4 repression of miR-29a expression and thus up-regulates miR-29a expression, thereby inhibiting fibroblast–myofibroblast differentiation and myocardial fibrosis. Our work has established a novel Circ-sh3rf3/GATA-4/miR-29a regulatory cascade in fibroblast–myofibroblast differentiation and myocardial fibrosis, which provides a new therapeutic target for myocardial fibrosis.
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Acknowledgements
We are grateful to members of the Zang’s lab for helpful discussions. We thank Xiu-Hua Ren for histological sections.
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This study was supported by the National Natural Science Foundation of China (Nos. 82072975, 81771631, and 32171179), the High-Level Talents of Henan Province, particularly the support for the Central Plains Thousand Talents Program, which are the leading talents of Central Plains Basic Research (ZYQR201810120); the key project of discipline construction of Zhengzhou University in 2020 (XKZDQY202002), 2022 Henan Province Science and Technology R&D Program Joint Fund (Cultivation of Superior Disciplines, 222301420094), and Henan Province Science and Technology Projects (202102310057).
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YQ and M-XZ conceived, designed, and supervised the study. C-XM, Zh-RW, K-LK, Y-QS, M-HY, J-CS, M-JZ, TS, and Z-WW performed the experiments. JC, WL, T-QW, S-FZ, LX, and MZ provided the technical support and contributed to the discussion of the project and article. YQ and M-XZ analysed the data and wrote the article.
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Ma, CX., Wei, ZR., Sun, T. et al. Circ-sh3rf3/GATA-4/miR-29a regulatory axis in fibroblast–myofibroblast differentiation and myocardial fibrosis. Cell. Mol. Life Sci. 80, 50 (2023). https://doi.org/10.1007/s00018-023-04699-7
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DOI: https://doi.org/10.1007/s00018-023-04699-7