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01.12.2017 | Research article | Ausgabe 1/2017 Open Access

BMC Cardiovascular Disorders 1/2017

miR-21 enhances cardiac fibrotic remodeling and fibroblast proliferation via CADM1/STAT3 pathway

BMC Cardiovascular Disorders > Ausgabe 1/2017
Wei Cao, Peng Shi, Jian-Jun Ge



Cardiac fibrosis play a key role in the atrial fibrillation pathogenesis but the underlying potential molecular mechanism is still understood. However, potential mechanisms for miR-21 upregulation and its role in cardiac fibrosis remain unclear. The controls cell proliferation and processes fundamental to disease progression.


In this study, immunohistochemistry, real-time RT-PCR, cell transfection, cell cycle, cell proliferation and Western blot were used, respectively.


Here we have been demonstrated that the tumor suppressor cell adhesion molecule 1 (CADM1) is the potential target of miR-21. Our study revealed that miR-21 regulation of CADM1 expression, which was decreased in cardiac fibroblasts and fibrosis tissue. The cardiac fibroblasts transfected with miR-21 mimic promoted miR-21 overexpression enhanced STAT3 expression and decreased CADM1 expression. Nevertheless, the cardiac fibroblasts transfected with miR-21 inhibitor obtained the opposite expression result. Furthermore, downexpression of miR-21 suppressed cardiac fibroblast proliferation.


These results suggested that miR-21 overexpression promotes cardiac fibrosis via STAT3 signaling pathway by decrease CADM1 expression, indicating miR-21 as an important signaling molecule for cardiac fibrotic remodeling and AF.
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