title: S-adenosyl-L-methionine decreases the elevated hepatotoxicity induced by Fas agonistic antibody plus acute ethanol pretreatment in mice.
abstract: The current study was designed to investigate the effect and potential mechanism of exogenous administration of S-adenosyl-l-methionine (SAM) on the enhanced hepatotoxicity induced by the Fas agonistic Jo2 antibody plus acute ethanol pretreatment in C57BL/6 mice. Acute ethanol plus Jo2 treatment produces liver toxicity under conditions in which ethanol alone or Jo2 alone do not. SAM significantly attenuated this elevated hepatotoxicity in mice as manifested by a decrease of serum aminotransferases and morphological amelioration. Levels of SAM and activity of methionine adenosyltransferase were lowered by the ethanol plus Jo2 treatment but restored by administration of SAM. The ethanol plus Jo2 treatment increased activity and content of CYP2E1, iNOS content and TNF-alpha levels; these increases were blunted by SAM. SAM also protected against the elevated oxidative and nitrosative stress found after ethanol plus Jo2, likely due to the decreases in CYP2E1, iNOS and TNF-alpha. Calcium-induced swelling of mitochondria was enhanced by the ethanol plus Jo2 treatment and this was prevented by SAM. JNK and P38 MAPK were activated by the ethanol plus Jo2 treatment; JNK activation was partially prevented by SAM. It is suggested that SAM protects against the ethanol plus Jo2 toxicity by restoring hepatic SAM levels, preventing the increase in iNOS, CYP2E1 and TNF-alpha and there by lowering the elevated oxidative/nitrosative stress and activation of the JNK signal pathway, ultimately preventing mitochondrial damage.
authors.affiliation: Department of Pharmacology and Systems Therapeutics, Mount Sinai School of Medicine, One Gustave L. Levy Place, 1468 Madison Avenue, New York, NY 10029, USA. xdwang1964@yahoo.com
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Wang
authors.forename: Arthur I
authors.initials: AI
authors.lastname: Cederbaum
mesh_terms: D000818:Animals; D000906:Antibodies / Q000276:immunology; D056486:Chemical and Drug Induced Liver Injury; D019392:Cytochrome P-450 CYP2E1 / Q000378:metabolism; D000431:Ethanol / Q000037:antagonists & inhibitors* / Q000633:toxicity; D007150:Immunohistochemistry; D020287:In Situ Nick-End Labeling; D008099:Liver / Q000187:drug effects* / Q000648:ultrastructure; D008107:Liver Diseases / Q000276:immunology / Q000517:prevention & control*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008930:Mitochondria, Liver / Q000187:drug effects* / Q000201:enzymology; D008933:Mitochondrial Swelling / Q000187:drug effects; D052247:Nitric Oxide Synthase Type II / Q000378:metabolism; D018384:Oxidative Stress; D012436:S-Adenosylmethionine / Q000008:administration & dosage / Q000494:pharmacology*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D019014:fas Receptor / Q000819:agonists* / Q000276:immunology
chemical_list: D000906:Antibodies; D014409:Tumor Necrosis Factor-alpha; D019014:fas Receptor; D000431:Ethanol; D012436:S-Adenosylmethionine; D019392:Cytochrome P-450 CYP2E1; D052247:Nitric Oxide Synthase Type II