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Actin is oxidized during myocardial ischemia
S R Powell1, E M Gurzenda, S E Wahezi
1Maternal/Fetal Medicine Research Lab., Department of Obstetrics and Gynecology, Winthrop University Hospital, Mineola, NY 11501, USA. spowell@winthrop.org
Free Radical Biology & Medicine
|May 23, 2001
Summary
Oxidative damage to actin proteins in rat hearts significantly impairs contractile function after ischemia and reperfusion. This suggests protein oxidation is a key factor in heart dysfunction following reduced blood flow.
Area of Science:
- Cardiovascular Physiology
- Biochemistry
- Cellular Biology
Background:
- Ischemia and reperfusion injury significantly impacts cardiac function.
- Oxidative stress is implicated in cellular damage during reperfusion.
Purpose of the Study:
- To investigate the role of actin oxidation in postischemic cardiac dysfunction.
- To determine if increased actin carbonyl content correlates with impaired heart contractility.
Main Methods:
- Isolated rat hearts subjected to global ischemia (30 min) followed by reperfusion (60 min).
- Quantification of actin carbonyl group content.
- Assessment of postischemic cardiac contractile function.
Main Results:
- A significant 80% increase in actin carbonyl content was observed post-reperfusion (p <.05).
- Postischemic contractile function was significantly depressed (p <.05).
- A strong correlation between increased actin oxidation and reduced cardiac function was found.
Conclusions:
- Oxidation of actin, a key contractile protein, contributes to cardiac dysfunction after ischemia-reperfusion.
- Targeting protein oxidation may offer therapeutic strategies for heart protection.