Feeding Rats Diets Containing Cheno- or Ursodeoxycholic Acid or Cholestyramine Modifies Intestinal Uptake of Glucose and Lipids

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Abstract
We wished to test the hypothesis that variations in the luminal content of bile acid produced by feeding chenodeoxycholic acid (CDC), ursodeoxycholic acid (UDC) or cholestyramine (C) alter intestinal transport properties and morphology. Rats were fed standard chow pellets containing 0.5% CDC, 0.5% UDC or 2% C for a period of 2 weeks, and the in vitro uptake of glucose, cholesterol, bile acids and a homologous series of fatty acids was assessed. The food consumption was similar in animals fed chow, CDC, UDC and C, yet rats fed CDC or UDC gained less weight, and the weight of the jejunal and ileal mucosa was lower in animals fed CDC or C than in those fed chow or UDC. Ileal but not jejunal uptake of glucose was reduced in animals fed UDC, CDC or C. The active ileal uptake of bile acids was enhanced by UDC, CDC or C, whereas the jejunal passive permeability to bile acids was reduced by feeding C. Feeding C inhibited the jejunal and ileal uptake of cholesterol; C, UDC and CDC had a variable effect on the intestinal uptake of the fatty acids 10:0-18:0. The jejunal mucosal surface area was lower in groups fed CDC or UDC as compared with rats fed chow or C, and the ileal mucosal surface area was lower in rats fed CDC. However, the altered intestinal transport could not be explained by the latered morphology. Thus, (1) chronic variations in the intestinal luminal content of bile acids produced by the feeding of CDC, UDC or C resulted in alterations in the active and passive transport properties of the intestine, and (2) these changes differed between the jejunum and the ileum and were not explained simply by alterations in the animals'' food intake or mucosal morphology. These studies suggest that chronic variations in the bile acids in the intestinal lumen may be one of the factors independently influencing the transport properties and mucosal surface area of the intestine. The long-term effect of changes in luminal bile acid content on intestinal function in man remains to be established.