Yasuhiro Masubuchi1, Chieko Suda, Toshiharu Horie. 1. Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan.
Abstract
BACKGROUND/AIMS: Although mitochondria have been demonstrated as primary targets in acetaminophen hepatotoxicity, the mechanism for mitochondria-mediated toxicity has not been defined. We examined the role of mitochondrial permeability transition (MPT) in the acetaminophen-induced liver injury. METHODS: Male CD-1 mice were given intraperitoneally acetaminophen (350 mg/kg) without or with cyclosporin A (50 mg/kg), a specific inhibitor of MPT. Serum alanine aminotransferase (ALT), a marker of liver injury, and other biochemical parameters were determined. RESULTS: Acetaminophen-induced ALT leakage was attenuated by co-administration of cyclosporin A. Cyclosporin A did not affect acetaminophen-induced early decrease in hepatic reduced glutathione (GSH) contents, indicating lack of the effect on the metabolic activation. Acetaminophen-induced decrease in mitochondrial GSH and ATP contents, and cytosolic leakage of cytochrome c were attenuated by cyclosporin A, suggesting that mitochondrial oxidative stress and ATP depletion resulting from MPT are principle mechanisms involved in acetaminophen-induced liver injury. Mitochondrial swelling by calcium was exacerbated in the mitochondria isolated from the acetaminophen-treated mice. In vitro exposure of intact mitochondria to N-acetyl-p-benzoquinone imine (NAPQI) with calcium caused mitochondrial swelling. CONCLUSIONS: The present data indicate that the MPT is the principal mechanism in the acetaminophen-induced liver injury and NAPQI is a candidate to open the transition pore.
BACKGROUND/AIMS: Although mitochondria have been demonstrated as primary targets in acetaminophenhepatotoxicity, the mechanism for mitochondria-mediated toxicity has not been defined. We examined the role of mitochondrial permeability transition (MPT) in the acetaminophen-induced liver injury. METHODS: Male CD-1 mice were given intraperitoneally acetaminophen (350 mg/kg) without or with cyclosporin A (50 mg/kg), a specific inhibitor of MPT. Serum alanine aminotransferase (ALT), a marker of liver injury, and other biochemical parameters were determined. RESULTS:Acetaminophen-induced ALT leakage was attenuated by co-administration of cyclosporin A. Cyclosporin A did not affect acetaminophen-induced early decrease in hepatic reduced glutathione (GSH) contents, indicating lack of the effect on the metabolic activation. Acetaminophen-induced decrease in mitochondrial GSH and ATP contents, and cytosolic leakage of cytochrome c were attenuated by cyclosporin A, suggesting that mitochondrial oxidative stress and ATP depletion resulting from MPT are principle mechanisms involved in acetaminophen-induced liver injury. Mitochondrial swelling by calcium was exacerbated in the mitochondria isolated from the acetaminophen-treated mice. In vitro exposure of intact mitochondria to N-acetyl-p-benzoquinone imine (NAPQI) with calcium caused mitochondrial swelling. CONCLUSIONS: The present data indicate that the MPT is the principal mechanism in the acetaminophen-induced liver injury and NAPQI is a candidate to open the transition pore.
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