Abstract
Matrix metalloproteinase (MMP)-2 is a zinc-dependent endopeptidase which, alongside its known extracellular actions, plays fundamental roles in oxidative stress-induced injury to the heart. Intracellular cleavage targets of MMP-2 selectively mediating this injury include the sarcomeric proteins troponin I, myosin light chain-1 and titin; some of these are also targeted by calpains. In myocardial ischemia and reperfusion injury, inhibitors of MMP-2 and some calpain inhibitors were shown to improve the recovery of contractile function. We hypothesized that the protective effects of calpain inhibitors may be due in part to their ability to inhibit MMP-2. Four calpain inhibitors (calpain inhibitor III, ALLM, ALLN, and PD-150606) were tested for their ability to inhibit MMP-2 in comparison to the selective MMP inhibitor ONO-4817. At 100 μM, all calpain inhibitors, except ALLM, showed significant inhibition of MMP-2 gelatinolytic activity. When assessed by the troponin I proteolysis assay, both ALLN and PD-150606, but neither ALLM nor calpain inhibitor III (at 20 μM), significantly inhibited MMP-2 activity. Using a fluorogenic MMP substrate peptide OmniMMP in a kinetic assay the rank order of IC(50) values against MMP-2 were: PD-1506...Continue Reading
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