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Nickel effects on hepatic amino acids
M C Herrero1, C Alvarez, J Cartañà
1Departament d'Enginyeria Química i Bioquímica, Universitat de Barcelona, Tarrogona, Spain.
Research Communications in Chemical Pathology and Pharmacology
|February 1, 1993
Summary
Nickel exposure significantly depleted hepatic glutathione (GSH) in rats. This depletion was not due to precursor amino acid availability but may involve altered taurine levels, potentially impacting membrane protection.
Area of Science:
- Biochemistry
- Toxicology
- Environmental Health
Background:
- Nickel is a toxic metal with known adverse health effects.
- Glutathione (GSH) is a critical endogenous antioxidant and detoxifying agent.
- Understanding the biochemical mechanisms of nickel toxicity is crucial for risk assessment.
Purpose of the Study:
- To investigate the impact of acute nickel exposure on hepatic glutathione levels.
- To determine the effect of nickel on the concentrations of precursor amino acids involved in GSH synthesis.
- To explore potential roles of other amino acids, like taurine, in nickel-induced liver injury.
Main Methods:
- Female Wistar rats were administered a single intraperitoneal injection of nickel (Ni(II)).
- Liver tissue was collected 90 minutes post-injection.
- Concentrations of glutathione and twenty amino acids were quantified.
Main Results:
- Nickel exposure caused a significant decrease in hepatic glutathione content.
- Cysteine, a GSH precursor, levels increased, while glycine and glutamate remained unaffected.
- Phenylalanine levels doubled, and taurine levels decreased significantly, potentially compromising membrane integrity.
Conclusions:
- Hepatic GSH depletion following acute nickel exposure is not linked to reduced precursor amino acid availability.
- The drastic reduction in taurine suggests a compromised role in membrane protection, contributing to nickel's toxicity.
- Further research is warranted to elucidate taurine's role in nickel-induced hepatotoxicity.