ACTA1 and Myocardial fibrosis: Proteins related to the myocardial fibrosis were detected by Western blot; the result showed that the expression of α‐sma, collagen I, and MMP‐9 was increased in the myocardium of the MI rats compared with that of sham rats and that they were decreased by Calhex231 (Figure 1 C‐F).