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Hydroxyl radical generation by postischemic rat kidney slices in vitro
1Department of Veterinary Physiology and Pharmacology, Purdue University, West Lafayette, IN 47907.
Free Radical Biology & Medicine
|January 1, 1990
Summary
Hydroxyl radical (HO.) formation during kidney reoxygenation was quantified. Toxic levels of HO. were not detected, suggesting cellular defenses or insufficient iron limit reperfusion injury.
Area of Science:
- Biochemistry
- Physiology
- Toxicology
Background:
- Reperfusion injury is a significant concern in organ transplantation and ischemia.
- Hydroxyl radicals (HO.) are implicated in cellular damage during reperfusion.
- Quantifying HO. formation is crucial for understanding its role in injury.
Purpose of the Study:
- To quantify hydroxyl radical (HO.) formation in rat kidney slices during ischemia and reoxygenation.
- To investigate the role of iron in mediating HO. generation during reperfusion.
Main Methods:
- Rat kidney slices were subjected to ischemia and reoxygenation in vitro.
- Dimethyl sulfoxide (DMSO) was used as a hydroxyl radical trap.
- Methane sulfinic acid (MSA), a product of DMSO oxidation, was measured using a colorimetric assay.
Main Results:
- A mean of 7 nmol cumulative HO./gram tissue was detected in reoxygenated kidney slices.
- This HO. generation was not significantly higher than in control tissues.
- Addition of EDTA-chelated iron markedly increased postischemic HO. generation.
Conclusions:
- Toxic levels of hydroxyl radicals are not significantly formed during rat kidney reoxygenation in vitro.
- Insufficient iron availability or potent cellular defenses may limit HO. formation.
- Further research is needed to fully elucidate the mechanisms of reperfusion injury.