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Copper-induced skeletal myopathy in rabbits
Summary
Copper acetate injections in rabbits caused inflammation and muscle damage. Repeated doses led to chronic inflammation and regeneration, with localized gangrene due to ischemia from copper accumulation.
Area of Science:
- Toxicology
- Pharmacokinetics
- Histopathology
Background:
- Copper is an essential trace element but can be toxic at higher doses.
- Understanding copper pharmacokinetics and local tissue effects is crucial for safety assessments.
Purpose of the Study:
- To investigate the local tissue effects and elimination kinetics of cupric acetate injected intramuscularly in rabbits.
Main Methods:
- Intramuscular injection of cupric acetate in rabbits.
- In vivo measurement of 64Cu to determine biological half-life.
- Histopathological examination of injection sites and distant tissues.
- Detection of copper using rubeanic acid stain.
Main Results:
- Biphasic elimination of copper with half-lives of 1.0 h and 14.6 h.
- Acute and chronic inflammation observed at injection sites, progressing with repeated doses.
- Distant dermatitis and muscle degeneration/regeneration noted.
- Ischemia-induced gangrene attributed to copper conglomerations.
Conclusions:
- Intramuscular cupric acetate induces local inflammatory and degenerative changes in rabbit muscle.
- Copper accumulation can lead to ischemia and gangrene.
- The study highlights the dose-dependent and time-dependent toxicity of copper acetate injections.