Ethanol feeding of micropigs alters methionine metabolism and increases hepatocellular apoptosis and proliferation

被引:149
作者
Halsted, CH
Villanueva, J
Chandler, CJ
Stabler, SP
Allen, RH
Muskhelishvili, L
James, SJ
Poirier, L
机构
[1] UNIV COLORADO,SCH MED,DEPT MED,DENVER,CO
[2] NATL CTR TOXICOL RES,JEFFERSON,AR 72079
关键词
D O I
10.1002/hep.510230314
中图分类号
R57 [消化系及腹部疾病];
学科分类号
摘要
Chronic alcoholism is associated with increased cancer risk that may be related to ethanol-induced alterations in methionine and deoxynucleotide metabolism. These metabolic relationships were studied in micropigs fed diets for 12 months that contained 40% ethanol or cornstarch control with adequate folate, Ethanol feeding altered methionine metabolism without changing mean terminal liver folate levels. After initial equilibration to diet, ethanol feeding significantly increased monthly serum homocysteine levels while reducing serum methionine levels over the time course of the experiment. After 12 months, hepatic methionine synthase activity and the ratio of S-adenosylmethionine (SAM) to S-adenosylhomocysteine (SAH) were significantly reduced in ethanol-fed animals, whereas the ratio of liver deoxyuridine triphosphate (dUTP) to deoxythymidine triphosphate (dTTP) was increased and correlated inversely with methionine synthase activity, These findings were associated with increased frequency of hepatocytes with apoptotic bodies and positivity for pro liferating cell nuclear antigen (PCNA) in livers from ethanol-fed minipigs, These studies suggest that chronic ethanol feeding perturbs methionine metabolism by impairment of methionine synthase activity, resulting in deoxynucleoside triphosphate (dNTP) imbalance, increased apoptosis, and regenerative proliferation, These biochemical alterations may provide a promoting environment for carcinogenesis during long-term ethanol exposure.
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页码:497 / 505
页数:9
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