Relationship between the increase of hepatic D-bifunctional protein activity and bile acid biosynthesis in rats.
- Author:
Ru-ling SHI
1
;
Chao-xian ZHAO
;
Hai-bao ZHU
;
Yuan YANG
;
Su-ling WANG
;
Ling-ling JIANG
Author Information
- Publication Type:Journal Article
- MeSH: 17-Hydroxysteroid Dehydrogenases; metabolism; Animals; Bile Acids and Salts; biosynthesis; Cholesterol 7-alpha-Hydroxylase; analysis; Enoyl-CoA Hydratase; metabolism; Liver; metabolism; Male; Multienzyme Complexes; metabolism; PPAR alpha; analysis; Peroxisomal Multifunctional Protein-2; RNA, Messenger; analysis; Random Allocation; Rats; Rats, Wistar
- From: Acta Academiae Medicinae Sinicae 2005;27(3):321-324
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo determine the physiological role of D-bifunctional protein (DBP) in bile acid biosynthesis through investigating the effect of increasing activity of DBP on bile acid biosynthesis.
METHODSTwenty male Wistar rats were divided into two groups: diethylhexyl phthalate (DEHP) group (n = 10) and control group (n = 10). Serum triglyceride, total cholesterol, hepatic DBP activity, and fecal bile acids were assayed. The mRNA levels of hepatic peroxisome proliferator-activated receptor alpha (PPARalpha), DBP, and cholesterol 7alpha-hydroxylase (CYP7A1) were detected by RT-PCR.
RESULTSCompared with control group, serum triglyceride level was decreased significantly and PPARalphamRNA level was increased significantly in DEHP group (P < 0.01). Together with a sharp induction of DBP mRNA expression and DBP activity in DEHP group (P < 0.01), the levels of CYP7A1 mRNA and fecal bile acids were significantly increased by 1.9 times and 1.6 times respectively compared to control group (P < 0.01). There was a significantly positive correlation between DBP mRNA level or DBP activity and CYP7A1 mRNA level (r = 0.89, P < 0.01; r = 0.95, P < 0.01).
CONCLUSIONThe up-regulation of DBP mRNA and activity in liver can result in the increase in CYP7A1 mRNA expression and bile acid biosynthesis, suggesting that DBP may be involved in bile acid biosynthesis together with CYP7A1.
