Autori: Viappiani S., Nicolescu A.C., Holt A., Sawicki G., Crawford B.D., León H., van Mulligen T., Schulz R

Editorial: Biochem. Pharmacol., 77(5), p.826-34, 2009.

Rezumat:

Matrix metalloproteinase-2 (MMP-2) has emerged as a key protease in various pathologies associated with oxidative stress, including myocardial ischemia-reperfusion, heart failure or inflammation. Peroxynitrite (ONOO(-)), an important effector of oxidative stress, was reported to activate some full length MMP zymogens, particularly in the presence of glutathione (GSH), but whether this occurs for MMP-2 is unknown. Treating MMP-2 zymogen with ONOO(-) resulted in a concentration-dependent regulation of MMP-2, with 0.3-1 microM ONOO(-) increasing and 30-100 microM ONOO(-) attenuating enzyme activity. The enzyme’s V(max) was also significantly increased by 1 microM ONOO(-). Comparable responses to ONOO(-) treatment were observed using the intracellular target of MMP-2, troponin I (TnI). GSH at 100 microM attenuated the effects of ONOO(-) on MMP-2. Mass spectrometry revealed that ONOO(-) can oxidize and, in the presence of GSH, S-glutathiolate the MMP-2 zymogen or a synthetic peptide containing the cysteine-switch motif in the enzyme’s autoinhibitory domain. These results suggest that ONOO(-) and GSH can modulate the activity of 72 kDa MMP-2 by modifying the cysteine residue in the autoinhibitory domain of the zymogen, a process that may be relevant to pathophysiological conditions associated with increased oxidative stress.

Cuvinte cheie: matrix metalloproteinase-2, oxidative stress; peroxynitrite; S-glutathiolation; troponin I

URL: http://www.ncbi.nlm.nih.gov/pubmed/19046943?ordinalpos=5&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DefaultReportPanel.Pubmed_RVDocSum