The role of ethanol metabolism in development of alcoholic steatohepatitis in the rat.

Alcohol
Martin J RonisThomas M Badger

Abstract

The importance of ethanol metabolism in the development of alcoholic liver disease remains controversial. The present study examined the effects of selective inhibition of the cytochrome P450 enzyme CYP2E1 compared with the inhibition of overall ethanol metabolism on the development of alcoholic steatohepatitis. Adult male Sprague-Dawley rats were fed via total enteral nutrition for 45 days with or without 10-12g/kg/d ethanol. Some groups were given 200mg/kg/d of the CYP2E1 inhibitor diallyl sulfide (DAS). Other groups were treated with 164mg/kg/d of the alcohol dehydrogenase (ADH) inhibitor 4-methylpyrazole (4-MP) and dosed at 2-3g/kg/d ethanol to maintain similar average urine ethanol concentrations. Liver pathology scores and levels of apoptosis were elevated by ethanol (P<.05) but did not differ significantly on cotreatment with DAS or 4-MP. However, liver triglycerides were lower when ethanol-fed rats were treated with DAS or 4-MP (P<.05). Serum alanine aminotransferase values were significantly lower in ethanol-fed 4-MP-treated rats indicating reduced necrosis. Hepatic oxidative stress and the endoplasmic reticulum (ER) stress marker tribbles-related protein 3 were increased after ethanol (P<.05); further increased by DAS...Continue Reading

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis