Are histamine H1 receptors involved in ischaemia/reperfusion injury in rat heart?
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J Dzierzkowska1, A Witanowska, E Wojtecka-Lukasik
1Department of Pathophysiology, Medical Academy, Warsaw, Poland.
Abstract:
During ischaemia, there was no apparent change in malondialdehyde (MDA) content in rat myocardium. However, reoxygenation resulted in a significant increase in MDA content. The changes evoked by ischaemia and reoxygenation were significantly attenuated by addition of fenistil (histamine H1 receptor antagonist). Enzymatic antioxidant systems were not significantly modified in the different periods of ischaemia and after 30 min of reoxygenation. It is suggested, that maintenance of an adequate endogenous antioxidant reserve during ischaemia may be important in recovery upon reoxygenation.
Insights
Reoxygenation significantly increased malondialdehyde (MDA) in rat hearts, but fenistil treatment reduced this damage. Maintaining antioxidant reserves during ischemia may aid recovery.
Area of Science:
- Cardiovascular Science
- Biochemistry
- Pharmacology
Background:
- Ischemia-reperfusion injury is a significant clinical concern.
- Oxidative stress, indicated by malondialdehyde (MDA), plays a role in myocardial damage.
- Histamine H1 receptor antagonists are explored for cardioprotective effects.
Purpose of the Study:
- To investigate the role of oxidative stress during myocardial ischemia and reoxygenation.
- To evaluate the protective effect of fenistil (histamine H1 receptor antagonist) against ischemia-reperfusion injury.
- To assess the impact on endogenous antioxidant systems.
Main Methods:
- Induction of myocardial ischemia in rat models.
- Measurement of malondialdehyde (MDA) levels.
- Administration of fenistil and assessment of its effects.
- Analysis of enzymatic antioxidant systems.
Main Results:
- Malondialdehyde (MDA) levels did not change during ischemia but significantly increased upon reoxygenation.
- Fenistil administration significantly attenuated the MDA increase caused by ischemia and reoxygenation.
- Enzymatic antioxidant systems showed no significant modifications during ischemia or early reoxygenation.
Conclusions:
- Reoxygenation, not ischemia itself, triggers significant oxidative stress (MDA increase) in the myocardium.
- Fenistil demonstrates a cardioprotective effect by mitigating ischemia-reperfusion-induced oxidative damage.
- Adequate endogenous antioxidant capacity during ischemia may be crucial for myocardial recovery upon reoxygenation.