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. 1989 Jan;96(1):51–58. doi: 10.1111/j.1476-5381.1989.tb11783.x

Impaired mitochondrial oxidative energy metabolism following paracetamol-induced hepatotoxicity in the rat.

S S Katyare 1, J G Satav 1
PMCID: PMC1854327  PMID: 2522334

Abstract

1. Effects of paracetamol treatment in vivo at subtoxic (375 mg kg-1 body weight) and toxic (750 mg kg-1 body weight) doses on energy metabolism in rat liver mitochondria were examined. 2. Paracetamol treatment resulted in a significant loss in body weights without affecting the liver protein contents. Toxic doses, however, resulted in 21% decrease in the yield of mitochondrial proteins. 3. Subtoxic doses of paracetamol did not, in general, affect the respiratory parameters in the liver mitochondria except in the case of succinate where both the state 3 respiration and the ADP-phosphorylation rates increased by 28%. 4. Toxic doses of paracetamol caused 25 to 47% decrease in the state 3 respiration rates depending on the substrate used. ADP/O ratios also decreased significantly with pyruvate + malate and succinate as the substrates. Consequently, ADP-phosphorylation was impaired significantly from 20 to 63%. 5. Subtoxic doses of paracetamol resulted in increased contents of cytochrome c + c1 while the toxic doses caused lowering of the cytochromes aa3 and b contents. 6. Glutamate and succinate dehydrogenase activities decreased in both the experimental groups while Mg2+-ATPase activity was impaired only after toxic dose-treatment. 7. The results show that toxic doses of paracetamol result in impaired energy coupling in the liver mitochondria. Effects of subtoxic doses were also demonstrable in terms of impaired dehydrogenases activities.

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Selected References

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