Semi-quantitative evaluation of (A) IL-1β and (B) MMP-2 expression from immunohistochemical staining images in different groups. **P<0.01, ***P<0.001 for comparison between either two groups. Groups: MI, myocardial infarction model group treated with saline for 28 days; SH, sham; MG, model group treated with MG-132 for 28 days; PDTC, model group treated with pyrrolidine dithiocarbamic acid for 28 days; IL, interleukin; MMP, matrix metalloproteinase; NF, nuclear factor.