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Chronic Suppression of Cholesterol 7α-Hydroxylase by Dietary Chenodeoxycholic Acid in Neonatal Guinea Pigs: Its Effect on Subsequent Bile Acid Metabolism in the Adult
- Source :
- The Journal of Nutrition. 113:986-995
- Publication Year :
- 1983
- Publisher :
- Elsevier BV, 1983.
-
Abstract
- Treatment of neonatal guinea pigs with cholestyramine persistently increases the activity of hepatic cholesterol 7 alpha-hydroxylase (CH-7 alpha), the rate-limiting enzyme of bile acid biosynthesis. In this study, we examined whether CH-7 alpha activity could be persistently inhibited by manipulations (chenodeoxycholic acid feeding) during neonatal life. Male Hartley guinea pigs (2-3 days old) were fed 0.25% chenodeoxycholic acid (CDCA)-supplemented diet for 10 days or 6 weeks. Feeding CDCA for 10 days increased plasma cholesterol [controls (C), 25 +/- 3 vs. CDCA, 34 +/- 2 mg/dl]. Bile acid pool in animals fed CDCA for 10 days was nearly fivefold greater than controls (C, 5.8 +/- 0.3 vs. CDCA, 29.1 +/- 0.9 mg/100 g body weight), whereas CH-7 alpha activity was almost completely inhibited [C, 1.83 +/- 0.4 vs. CDCA, 0.02 +/- 0.02 pmol/(mg . minute)]. Four weeks after stopping CDCA feeding, CH-7 alpha was greater in the CDCA-fed animals (C, 0.47 +/- 0.03 vs. CDCA, 0.67 +/- 0.05). This was associated with a greater bile acid pool in these animals (C, 3.0 +/- 0.2 vs. CDCA, 5.8 +/- 0.4). We conclude that CDCA fed to neonatal guinea pigs inhibits CH-7 alpha activity. This inhibition is not permanent, however, since CH-7 alpha activity increases following withdrawal from chronic CDCA feeding.
- Subjects :
- Male
medicine.medical_specialty
medicine.drug_class
Guinea Pigs
Medicine (miscellaneous)
Alpha (ethology)
Caviidae
Chenodeoxycholic Acid
Cholesterol 7 alpha-hydroxylase
Bile Acids and Salts
chemistry.chemical_compound
Chenodeoxycholic acid
Internal medicine
medicine
Animals
Cholesterol 7-alpha-Hydroxylase
chemistry.chemical_classification
Nutrition and Dietetics
Cholestyramine
Bile acid
biology
Cholesterol
Body Weight
Age Factors
biology.organism_classification
Diet
Microscopy, Electron
Enzyme
Endocrinology
Liver
chemistry
Biochemistry
Steroid Hydroxylases
medicine.drug
Subjects
Details
- ISSN :
- 00223166
- Volume :
- 113
- Database :
- OpenAIRE
- Journal :
- The Journal of Nutrition
- Accession number :
- edsair.doi.dedup.....102efc39e02d4913f1e816b4e97cd90f