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Updated: Aug 13, 2026

Dynamic Assessments of Coronary Flow Reserve after Myocardial Ischemia Reperfusion in Mice
Published on: August 25, 2023
TNF-alpha contributes to endothelial dysfunction in ischemia/reperfusion injury
Cuihua Zhang1, Xiangbin Xu, Barry J Potter
1Department of Anesthesiology, LSU Health Sciences Center, New Orleans, LA 70112, USA. czhang@lsuhsc.edu
Myocardial ischemia/reperfusion injury causes coronary endothelial dysfunction by increasing tumor necrosis factor-alpha (TNF-alpha). This leads to xanthine oxidase activation and superoxide production, impairing blood vessel function.
Area of Science:
- Cardiovascular Science
- Inflammation Research
- Endothelial Biology
Background:
- Endothelial dysfunction in myocardial ischemia/reperfusion (I/R) injury lacks clear causal mechanisms.
- Tumor necrosis factor-alpha (TNF-alpha) is implicated in vascular inflammation and endothelial dysfunction.
Purpose of the Study:
- To investigate the role of TNF-alpha in I/R-induced coronary endothelial dysfunction.
- To test the hypothesis that TNF-alpha mediates I/R injury-induced endothelial dysfunction.
Main Methods:
- Utilized a murine model of myocardial I/R (30 minutes/90 minutes).
- Administered neutralizing antibodies against TNF-alpha to assess its role.
- Evaluated endothelial-dependent (acetylcholine) and independent (SNP) vasodilation.
- Measured superoxide (O2*-) production and xanthine oxidase activation.
Main Results:
- I/R significantly increased TNF-alpha expression (>4-fold).
- Endothelial-dependent vasodilation was impaired in I/R, while independent vasodilation was preserved.
- Blocking TNF-alpha, inhibiting xanthine oxidase, or scavenging superoxide restored endothelial function.
- I/R activated xanthine oxidase, an effect prevented by anti-TNF-alpha treatment.
Conclusions:
- Myocardial I/R induces TNF-alpha expression.
- TNF-alpha activates xanthine oxidase, leading to superoxide production.
- This cascade results in coronary endothelial dysfunction following I/R injury.
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