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Folate absorption in alcoholic pigs: in vivo intestinal perfusion studies.

To determine if impaired intestinal absorption contributes to the folate deficiency observed in chronic alcoholics, we assessed in vivo folate absorption in Hanford mini-pigs fed ethanol with an adequate diet. Sixteen minipigs were pair-fed diets supplemented with ethanol or sucrose to 60% of total calories for 11 mo. In the ethanol-fed pigs peak blood alcohol concentrations averaged 28 mmol/L, serum alanine transaminase and aspartate transaminase activities were elevated, and liver histology showed a centrilobular distribution of succinate dehydrogenase. Tissue folate concentrations were comparable in both groups. The jejunal uptake of folic acid, measured by intestinal perfusion, was similar in both groups of animals and was not affected by acute exposure to 445 mmol/L ethanol. The in vivo hydrolysis of polyglutamyl folate was reduced by 35% in one ethanol-fed minipig. Decreased hydrolysis of polyglutamyl folate may represent an early step in the development of folate deficiency in chronic alcoholics.