Intestinal cholesterol synthesis and mobilisation to blood in sucrose-feeding and alcohol-intake.
Small intestines synthesize cholesterol to a greater extent than liver. Between starch-fed and sucrose-fed rats, using (14C) glucose, it was found that the synthesis of cholesterol by the jejunum of small intestines was greater in the sucrose-fed group than starch-fed group. By a novel experimental technique and using (14C) glucose, it was found that the contribution towards buffer representing lymph was greater in the sucrose-fed group (13.3%) than the controls (11%). Hypercholesterolemia on sucrose feeding may be at least partly due to contribution by the small intestines. Regarding alcohol, using (14C) glucose it was found that total synthesis of cholesterol by the small intestines was decreased in alcohol-fed rats. There was no difference in the cholesterol retained by the intestinal tissue between the controls and alcohol-fed animals while, the secretion towards buffer (lymph) was 9% as against 11. This indicates that there is contribution of cholesterol to blood from small intestines in alcohol-intake also but due to overall decrease in the intestinal synthesis of cholesterol, contribution of intestines to hypercholesterolemia may not be substantial as in the case of sucrose feeding. This is because in sucrose-feeding there is increased cholesterol synthesis.
Pugalendi
K V
KV
Department of Biochemistry, Annamalai University, Annamalainagar 608 002.
Ramakrishnan
S
S
D000818:Animals; D002784:Cholesterol / Q000096:biosynthesis* / Q000097:blood; D000431:Ethanol / Q000008:administration & dosage*; D006903:Hydroxymethylglutaryl CoA Reductases / Q000378:metabolism; D007583:Jejunum / Q000201:enzymology / Q000378:metabolism*; D008297:Male; D051381:Rats; D013395:Sucrose / Q000008:administration & dosage*
D000431:Ethanol; D013395:Sucrose; D002784:Cholesterol; D006903:Hydroxymethylglutaryl CoA Reductases