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Biochemical mechanisms involved in the hepatotoxicity of some drugs
1Clinical Hospital Fundeni, Bucharest, Romania.
Abstract:
To find out the biochemical mechanisms involved in the hepatotoxicity of certain drugs, the continuous evolution of some related biochemical parameters was investigated. The results obtained showed the decrease of cytochrome P450, glutathione (GSH) and aniline hydroxylase, as well as increases of lipid peroxides and tryptophan oxygenase 2 hours after i.p. administration of carbon tetrachloride (CCl4) and paracetamol. Characteristic changes of hepatotoxicity such as increase of blood glutamate-pyruvate transaminase (GPT) and triglycerides, and decrease of free sulfhydryl (SH) groups were observed 24 hours after drug administration. The peroxidation of microsomal lipids appears to be the biochemical mechanism involved in the acute administration of these drugs. Subsequently this peroxidation leads to morphologic hepatic changes. In our experimental conditions, hepatotoxicity was prevented by concomitant administration of cystamine.
Insights
Drug-induced liver injury involves decreased cytochrome P450 and glutathione, with increased lipid peroxides. This hepatotoxicity, linked to lipid peroxidation, can be prevented by cystamine.
Area of Science:
- Biochemistry
- Toxicology
- Pharmacology
Background:
- Hepatotoxicity from certain drugs necessitates understanding underlying biochemical mechanisms.
- Investigating biochemical markers provides insight into drug-induced liver injury.
Purpose of the Study:
- To elucidate the biochemical pathways of drug-induced hepatotoxicity.
- To identify key biochemical parameters indicative of liver damage.
Main Methods:
- Monitoring cytochrome P450, glutathione (GSH), aniline hydroxylase, lipid peroxides, and tryptophan oxygenase.
- Assessing blood glutamate-pyruvate transaminase (GPT) and triglyceride levels.
- Observing changes in free sulfhydryl (SH) groups.
Main Results:
- Carbon tetrachloride (CCl4) and paracetamol administration caused rapid decreases in cytochrome P450, GSH, and aniline hydroxylase, alongside increases in lipid peroxides and tryptophan oxygenase.
- Delayed effects (24 hours) included elevated GPT and triglycerides, and reduced SH groups, characteristic of hepatotoxicity.
- Microsomal lipid peroxidation was identified as a key mechanism leading to acute drug-induced liver damage and subsequent morphologic changes.
Conclusions:
- Lipid peroxidation is a critical mechanism in acute drug-induced hepatotoxicity.
- Concomitant administration of cystamine effectively prevented observed hepatotoxicity in experimental models.