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SPARC-related modular calcium binding 1 (SMOC1) represents a vital member of the SPARC matricellular protein family that regulates cell matrix interaction through binding to cell-surface receptors. The present study aimed to investigate the roles and molecular mechanisms of SMOC1 silencing on the fibrosis of myocardial fibroblasts (MFBs). Cell Counting kit-8 and flow cytometry assays were performed to determine cell viability and reactive oxygen species (ROS) content, respectively. ELISA was performed to detect the expression of associated cytokines and matrix proteins. Western blot analysis and reverse transcription-quantitative polymerase chain reaction assays were used to evaluate the expression of associated proteins and mRNAs, respectively. The results revealed that SMOC1 silencing suppressed the cell viability of angiotensin II (Ang II)-treated MFBs. SMOC1 silencing reduced the ROS content and oxidative stress in MFBs in response to Ang II. Furthermore, SMOC1 silencing downregulated the expression levels of fibrosis-associated proteins in Ang II-treated MFBs. SMOC1 silencing affected the bone morphogenetic protein 2 (BMP2)/Smad signaling pathway in Ang II-treated MFBs. In conclusion, the results of the present study suggested that SMOC1 silencing suppressed the Ang II-induced myocardial fibrosis of mouse MFBs through affecting the BMP2/Smad signaling pathway.

SMOC1 silencing suppresses the angiotensin�II‑induced myocardial fibrosis of mouse myocardial fibroblasts via affecting the BMP2/Smad pathway