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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Cholestyramine and a fat-free diet lower apolipoprotein A-IV mRNA in jejunum and cholestyramine lowers apolipoprotein A-I mRNA in ileum of rats.

To investigate the effect of bile acids or dietary lipid on the expression of intestinal apolipoproteins, the mRNA levels of apolipoprotein A-I and A-IV in the intestine from rats fed a diet containing cholestyramine or a fat-free diet were compared with those from rats fed a control diet containing 25% casein and 5% corn oil. Plasma total cholesterol concentration was lower after 16 h in rats fed a diet containing cholestyramine or a fat-free diet than in rats fed a control diet. In rats fed the fat-free diet, HDL cholesterol concentration also was lower than in those fed the control diet. The pool of bile acid in intestinal contents was significantly lower in rats fed cholestyramine than in both other groups. The relative abundance of jejunal apolipoprotein A-I mRNA did not differ between groups. Jejunal apolipoprotein A-IV mRNA abundance was significantly lower than in controls in rats fed the fat-free and cholestyramine-containing diets. Abundance of apolipoprotein A-I mRNA in ileal mucosa was comparable to controls in rats fed a fat-free diet but was significantly lower in rats fed cholestyramine. Ileal apolipoprotein A-IV mRNA tended to be lower in rats fed cholestyramine and a fat-free diet than in controls. We propose that decreased absorption of dietary lipid may modulate changes in jejunal apolipoprotein A-IV mRNA level and low levels of bile acids in the lumen may modulate changes in ileal apolipoprotein A-I mRNA level.[1]


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