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• W1966280666 abstract "CCl4 exerts its toxicity through its metabolites, including the free radicals CCl3. and CCl(3)00.. Oxygen strongly inhibits the hepatic cytochrome P-450-mediated formation of CCl3. from CCl4 and promotes the conversion of CCl3. to CCl(3)00.. Both these free radicals injure the hepatocyte by causing lipid peroxidation and binding covalently to cell structures. A reduced glutathione (GSH)-dependent mechanism can protect the liver microsomal membrane against CCl4-induced damage under aerobic conditions but not under anaerobic conditions (Burk, R.F., K. Patel, and J.M. Lane, 1983, Biochem. J., 215:441-445). Experiments were carried out using rat liver microsomes to examine the effect of O2 tensions found in the liver and of GSH on CCl4-induced covalent binding and lipid peroxidation. An NADPH-supplemented microsomal system was used. CCl4 or 14CCl4 was added to the sealed flask that contained the system, and after 20 min CHCl3 production, thiobarbituric acid-reactive substances (an index of lipid peroxidation), and covalent binding of 14C were measured. O2 tensions of 0, 1, 3, 5, and 21% were studied. Increases in O2 tension caused a fall in CHCl3 production, which indicated that it decreased CCl3.. GSH had no significant effect on CHCl3 production at any O2 tension. Lipid peroxidation and covalent binding of 14C fell progressively as O2 tension was increased from 1 to 21%. The addition of GSH decreased both lipid peroxidation and covalent binding, but did so better at the higher O2 tensions than at the lower ones. These results indicate that low O2 tensions such as are found in the centrilobular areas of the liver favor conversion of CCl4 to free radical products which cannot be detoxified by the GSH-dependent mechanism. They suggest that hyperbaric O2 might decrease free radical formation in the liver in vivo and promote formation of CCl(3)00. from CCl3.. This should result in diminished CCl4-induced lipid peroxidation and liver damage. Rats given CCl4 (2.5 ml/kg) were studied in metabolic chambers. Production of CHCl3 and ethane, the latter an index of lipid peroxidation, were measured. Rats in two atmospheres of 100% O2 produced much less CHCl3 and ethane than rats in air. This strongly suggests that hyperbaric O2 is decreasing free radical formation from CCl4 and/or promoting the formation of CCl(3)00. from CCl3.. These results provide the rationale for the use of hyperbaric O2 in the treatment of CCl4 ingestion." @default.
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• W1966280666 title "Relationship of oxygen and glutathione in protection against carbon tetrachloride-induced hepatic microsomal lipid peroxidation and covalent binding in the rat. Rationale for the use of hyperbaric oxygen to treat carbon tetrachloride ingestion." @default.
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• W1966280666 doi "https://doi.org/10.1172/jci111621" @default.
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