Document Detail


Effect of an enriched cholesterol diet during gestation on fatty acid synthase, HMG-CoA reductase and SREBP-1/2 expressions in rabbits.
MedLine Citation:
PMID:  17707438     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Pregnancy is associated with hyperlipidemia and hypercholesterolemia in humans. These changes take place to support fetal growth and development, and modifications of these maternal concentrations may influence lipids and cholesterol synthesis in the dam, fetus and placenta. Administration of a 0.2% enriched cholesterol diet (ECD) during rabbit gestation significantly increased cholesterol and triglyceride (TG) levels in maternal livers and decreased fetal weight by 15%. Here we used Western blot analysis to examine the impact of gestation and 0.2% ECD on the expression levels of fatty acid synthase (FAS), HMGR and SREBP-1/2, which are involved in either lipid or cholesterol synthesis. We confirmed that gestation modifies the hepatic and circulating lipid profile in the mother. Our data also suggest that the maternal liver mainly supports lipogenesis, while the placenta plays a key role in cholesterol synthesis. Thus, our data demonstrate a decrease in HMGR protein levels in dam livers by feeding an ECD. In the placenta, SREBPs are highly expressed, and the ECD supplementation increased nuclear SREBP-1/2 protein levels. In addition, our results show a decrease in FAS protein levels in non-pregnant liver and in the liver of offspring from ECD-treated animals. Finally, our data suggest that the placenta does not modify its own cholesterol synthesis in response to an increase in circulating cholesterol. However, the dam liver compensates for this increase by essentially decreasing the level of HMGR expression. Because HMGR and FAS expressions do not correlate with the circulating lipid profile, it would be interesting to find which genes are then targeted by SREBP-1/2 during gestation.
Authors:
C Marseille-Tremblay; A Gravel; J Lafond; C Mounier
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-07-28
Journal Detail:
Title:  Life sciences     Volume:  81     ISSN:  0024-3205     ISO Abbreviation:  Life Sci.     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-08-27     Completed Date:  2007-10-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375521     Medline TA:  Life Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  772-8     Citation Subset:  IM    
Affiliation:
Laboratoire de Physiologie materno-foetale, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Québec, Canada H3C 3P8.
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MeSH Terms
Descriptor/Qualifier:
Animal Feed
Animals
Blotting, Western
Cholesterol / blood
Cholesterol, Dietary / administration & dosage*
Fatty Acid Synthetase Complex / biosynthesis*
Female
Hydroxymethylglutaryl CoA Reductases / biosynthesis*
Hypercholesterolemia / blood,  complications,  enzymology*
Liver / enzymology
Placenta / enzymology
Pregnancy
Pregnancy Complications / blood,  enzymology*
Rabbits
Sterol Regulatory Element Binding Protein 1 / biosynthesis*
Sterol Regulatory Element Binding Protein 2 / biosynthesis*
Triglycerides / blood
Chemical
Reg. No./Substance:
0/Cholesterol, Dietary; 0/Sterol Regulatory Element Binding Protein 1; 0/Sterol Regulatory Element Binding Protein 2; 0/Triglycerides; 57-88-5/Cholesterol; EC 1.1.1.-/Hydroxymethylglutaryl CoA Reductases; EC 6.-/Fatty Acid Synthetase Complex

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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