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Journal of Parenteral and Enteral Nutrition
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A Comparison of Intestinal Adaptation to Short-Term Intravenous Versus Intragastric Diet in Adult Rats

Francis Raul, PH.D.

Institut National de la Santé et de la Recherche Médicale, Strasbourg, France

Michel Galluser, M.S.

Institut National de la Santé et de la Recherche Médicale, Strasbourg, France

Michel Doffoel, M.D.

Institut National de la Santé et de la Recherche Médicale, Strasbourg, France

This study was designed to determine, on intestinal function, the comparative effects of a fat emulsion, a carbohydrate solution, and a mixture of lipids and carbohydrates given for 4 days to adult rats either intragastrically or intravenously. The rats were separated into three groups (n = 24 in each group). Each group was divided into two populations fed either intragastrically or intravenously. Each group received one of the following nutrients: a 20% Intralipid emulsion, a mixture (1:1, V/V) of Intralipid 20% and Vamine N containing 25% glucose (W/V), a solution of Vamine-glucose supplemented with fructose to reach a final concentration of 20% (W/V). Sham-operated rats that received laboratory chow orally were used as controls. The daily caloric intake was 0.21 to 0.22 kcal/g body weight. The studies on villus morphology and on brush border enzyme activities were performed on the proximal part of the jejunum. For all nutrients, intragastric infusion provoked an increase in the villus height. The lipids were the only nutrients to cause villus lengthening by the intravenous route. Intragastric or intravenous infusion of fat provoked a deficiency in intestinal disaccharidases: the presence of carbohydrates in the diet inhibited this effect slightly. Carbohydrates given alone, either intragastrically or intravenously, caused an elevation of lactase activity. Independent of diet composition, aminopeptidase activity was reduced after intravenous feeding.

In conclusion, the disaccharidase activities are largely dependent on changes occurring in the nutrient composition given either intragastrically or intravenously, whereas aminopeptidase activity was related to the route of diet administration. (Journal of Parenteral and Enteral Nutrition 11:389-393, 1987)

Journal of Parenteral and Enteral Nutrition, Vol. 11, No. 4, 389-393 (1987)
DOI: 10.1177/0148607187011004389
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