Premium
Role of matrix metalloproteinase‐2 in the cardioprotective effect of ischaemic postconditioning
Author(s) -
Donato Martín,
D’Annunzio Verónica,
Buchholz Bruno,
Miksztowicz Verónica,
Carrión Cristina Lorenzo,
Valdez Laura B.,
Zaobornyj Tamara,
Schreier Laura,
Wikinski Regina,
Boveris Alberto,
Berg Gabriela,
Gelpi Ricardo J.
Publication year - 2010
Publication title -
experimental physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 101
eISSN - 1469-445X
pISSN - 0958-0670
DOI - 10.1113/expphysiol.2009.049874
Subject(s) - ischemia , medicine , matrix metalloproteinase , cardiology , myocardial infarction , reperfusion injury , pharmacology
The activation of matrix metalloproteinases (MMPs) contributes to myocardial injury at the onset of reperfusion; however, their role in ischaemic postconditioning is unknown. The aim of the present study was to examine the effects of ischaemic postconditioning on MMP activity in isolated rabbit hearts. The isolated rabbit hearts were subjected to 30 min of global ischaemia followed by 180 min of reperfusion (I/R group; n = 8). In the ischaemic postconditioning group ( n = 8), a postconditioning protocol was performed (2 cycles of 30 s reperfusion–ischaemia). In other experiments, we added doxycycline, an MMP inhibitor, at 25 ( n = 7) or 50 μmol l −1 ( n = 8) during the first 2 min of reperfusion. Coronary effluent and left ventricular tissue were collected during pre‐ischaemic conditions and at different times during the reperfusion period to measure MMP–2 activity and cardiac protein nitration. We evaluated ventricular function and infarct size. In the I/R group, infarct size was 32.1 ± 5.2%; Postcon reduced infarct size to 9.5 ± 3.8% ( P < 0.05) and inhibited MMP–2 activity during reperfusion. The administration of doxycycline at 50 μmol l −1 inhibited MMP–2 activity and cardiac protein nitration and reduced the infarct size to 9.7 ± 2.8% ( P < 0.05). A lower dose of doxycycline (25 μmol l −1 ) failed to inhibit MMP–2 activity and did not modify the infarct size. Our results strongly suggest that ischaemic postconditioning may exert part of its cardioprotective effects through the inhibition of MMP–2 activity.