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Updated: Sep 29, 2026
Model of Ischemia and Reperfusion Injury in Rabbits
Published on: November 3, 2023
Duration of ischaemia determines matrix metalloproteinase-2 activation in the reperfused rabbit heart
Ananth M Prasan1, Hugh C K McCarron, Melanie Y White
1Department of Medicine, University of Sydney, NSW, Australia.
Abstract:
It has been hypothesised that activation of matrix metalloproteinase-2 (MMP-2) contributes to reversible myocardial dysfunction (stunning) following short-term ischaemia and reperfusion. Gelatin zymography was used to measure release of both pro-MMP-2 (72 kDa) and MMP-2 (62 kDa), into the coronary effluent from isolated, perfused rabbit hearts during 90 min aerobic perfusion (control), or low-flow ischaemia (15 or 60 min at 1 mL/min), followed by 60 min reperfusion. In controls, pro-MMP-2 was detected in the coronary effluent throughout the first 30 min of aerobic perfusion, but MMP-2 was not detected. In contrast, MMP-2 was detected in the coronary effluent during reperfusion after both 15 and 60 min ischaemia. However, while left ventricular systolic function was impaired after both 15 min and 60 min ischaemia, a significant increase in the release of MMP-2 was only detected in hearts following 60 min ischaemia. The dissociation between mechanical function and MMP-2 levels suggest that MMP-2 does not contribute to myocardial stunning in this model, but may contribute to myocardial dysfunction following prolonged ischaemia.
Insights
Matrix metalloproteinase-2 (MMP-2) activation did not cause myocardial stunning after short ischemia. Elevated MMP-2 levels were only observed after prolonged ischemia, suggesting it contributes to dysfunction in longer ischemic events.
Area of Science:
- Cardiovascular Physiology
- Biochemistry
- Enzymology
Background:
- Matrix metalloproteinase-2 (MMP-2) is hypothesized to contribute to myocardial stunning after ischemia-reperfusion.
- Understanding MMP-2's role is crucial for developing treatments for ischemic heart disease.
Purpose of the Study:
- To investigate the role of MMP-2 activation in myocardial stunning following short-term ischemia and reperfusion in a rabbit heart model.
- To determine if MMP-2 levels correlate with the severity of myocardial dysfunction.
Main Methods:
- Isolated, perfused rabbit hearts were subjected to varying durations of low-flow ischemia (15 or 60 minutes) followed by reperfusion.
- Gelatin zymography was employed to quantify the release of pro-MMP-2 and active MMP-2 into the coronary effluent.
- Left ventricular systolic function was assessed to evaluate myocardial stunning.
Main Results:
- Pro-MMP-2 was detected in controls, while active MMP-2 appeared during reperfusion after both 15 and 60 minutes of ischemia.
- Myocardial stunning occurred after both 15 and 60 minutes of ischemia.
- A significant increase in MMP-2 release was observed only after 60 minutes of ischemia, not after 15 minutes.
Conclusions:
- The findings suggest that MMP-2 activation does not contribute to myocardial stunning in this model.
- MMP-2 may play a role in myocardial dysfunction following prolonged ischemia, rather than short-term stunning.
- Further research is needed to elucidate the precise mechanisms of MMP-2 in cardiac injury.
