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[Oxidative effect of hepatic copper overload]
A S Sansinanea1, S I Cerone, S A Streitenberger
1Departamento de Fisiopatología, Facultad de Ciencias Veterinarias, Campus Universitario, Tandil, Argentina.
Acta Physiologica, Pharmacologica Et Therapeutica Latinoamericana : Organo De La Asociacion Latinoamericana De Ciencias Fisiologicas Y [De] La Asociacion Latinoamericana De Farmacologia
|March 21, 1998
Summary
Excessive copper overload in rats induced liver damage by increasing free radicals, evidenced by elevated lipid peroxidation and altered antioxidant systems like Cu-Zn superoxide dismutase (Cu-Zn-SOD) and reduced glutathione (GSH).
Area of Science:
- Hepatotoxicity and oxidative stress research.
- Biochemical toxicology.
- Free radical damage mechanisms.
Context:
- Copper (Cu) is an essential trace element, but excessive levels can be toxic.
- Hepatocytes are susceptible to oxidative damage from metal overload.
- Understanding the biochemical pathways of copper-induced liver injury is crucial for toxicological studies.
Purpose:
- To investigate the mechanisms of liver cytotoxicity induced by excessive copper sulfate (CuSO4) in rats.
- To evaluate the impact of copper overload on lipoperoxidation and antioxidant systems in rat hepatocytes.
- To correlate changes in antioxidant markers with indicators of liver damage.
Summary:
- Administration of CuSO4 to Wistar rats resulted in increased liver copper content and significant lipid peroxidation across cellular fractions (homogenate, mitochondrial, microsomal).
- Thiobarbituric acid reacting substances, a marker of lipid peroxidation, were elevated, correlating with increased copper-zinc superoxide dismutase (Cu-Zn-SOD) activity.
- Reduced glutathione (GSH) levels decreased, suggesting that copper overload enhances oxidative stress and depletes cellular defenses.
- Elevated serum acid phosphatase (AP) activity indicated liver damage, occurring concurrently with observed biochemical changes.
Impact:
- This study elucidates the role of oxidative stress and lipid peroxidation in copper-induced hepatotoxicity.
- Findings highlight the disruption of antioxidant systems, including Cu-Zn-SOD and GSH, as key contributors to copper toxicity.
- Provides a biochemical basis for understanding liver damage in copper overload conditions, relevant for toxicology and environmental health.