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• W2101804080 endingPage "12745" @default.
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• W2101804080 abstract "Overdose of acetaminophen, a widely used analgesic drug, can result in severe hepatotoxicity and is often fatal. This toxic reaction is associated with metabolic activation by the P450 system to form a quinoneimine metabolite, N -acetyl- p -benzoquinoneimine (NAPQI), which covalently binds to proteins and other macromolecules to cause cellular damage. At low doses, NAPQI is efficiently detoxified, principally by conjugation with glutathione, a reaction catalyzed in part by the glutathione S -transferases (GST), such as GST Pi. To assess the role of GST in acetaminophen hepatotoxicity, we examined acetaminophen metabolism and liver damage in mice nulled for GstP ( GstP1/P2 (−/−) ). Contrary to our expectations, instead of being more sensitive, GstP null mice were highly resistant to the hepatotoxic effects of this compound. No significant differences between wild-type ( GstP1/P2 (+/+) ) mice and GstP1/P2 (−/−) nulls in either the rate or route of metabolism, particularly to glutathione conjugates, or in the levels of covalent binding of acetaminophen-reactive metabolites to cellular protein were observed. However, although a similar rapid depletion of hepatic reduced glutathione (GSH) was found in both GstP1/P2 (+/+) and GstP1/P2 (−/−) mice, GSH levels only recovered in the GstP1/P2 (−/−) mice. These data demonstrate that GstP does not contribute in vivo to the formation of glutathione conjugates of acetaminophen but plays a novel and unexpected role in the toxicity of this compound. This study identifies new ways in which GST can modulate cellular sensitivity to toxic effects and suggests that the level of GST Pi may be an important and contributing factor in the sensitivity of patients with acetaminophen-induced hepatotoxicity." @default.
• W2101804080 created "2016-06-24" @default.
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• W2101804080 date "2000-10-31" @default.
• W2101804080 modified "2023-10-18" @default.
• W2101804080 title "Increased resistance to acetaminophen hepatotoxicity in mice lacking glutathione <i>S</i> -transferase Pi" @default.
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• W2101804080 doi "https://doi.org/10.1073/pnas.220176997" @default.
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