J. Lipid Res.
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Originally published In Press as doi:10.1194/jlr.M700034-JLR200 on March 1, 2007

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Journal of Lipid Research, Vol. 48, 1362-1370, June 2007
Copyright © 2007 by American Society for Biochemistry and Molecular Biology

Ontogenic development-associated changes in the expression of genes involved in rat bile acid homeostasis

Susana Cuesta de Juan*, Maria J. Monte*, Rocio I. R. Macias*, Valérie Wauthier{dagger}, Pedro Buc Calderon{dagger} and Jose J. G. Marin1,*

* Laboratory of Experimental Hepatology and Drug Targeting, "Centro de Investigación Biomédica en Red" for Hepatology and Gastroenterology Research (CIBERehd), University of Salamanca, Salamanca, Spain
{dagger} Unite de Pharmacocinetique, Metabolisme, Nutrition, et Toxicologie, Departement des Sciences Pharmaceutiques, Universite Catholique de Louvain, Bruxelles, Belgium

Published, JLR Papers in Press, March 1, 2007.

1 To whom correspondence should be addressed. e-mail: jjgmarin{at}usal.es

Ontogenic changes in the rat bile acid (BA) pool, measured enzymatically and by GC-MS, and expression of enzymes (5{alpha}-reductase, 5ß-reductase, and cytochrome P450 enzymes Cyp7a1, Cyp8b1, Cyp27 and Cyp3a11), transporters [bile salt export pump, sodium taurocholate-cotransporting polypeptide, apical sodium-dependent bile acid transporter, and organic solute transporter {alpha}/ß (Ost{alpha}/Ostß)], and nuclear receptors [fetoprotein transcription factor (Ftf), farnesoid X receptor (Fxr), small heterodimer partner (Shp), and hepatic nuclear factor 4{alpha} (HNF-4{alpha})], determined by quantitative PCR, were investigated. The absolute size of the BA pool increased progressively up to adulthood, whereas the complexity of its composition was high in fetuses, decreased after birth, increased again progressively up to adulthood, and decreased in aged animals. Allo-cholic acid only appeared early in development, in spite of low 5{alpha}-reductase expression. The relative size of the BA pool, corrected by liver weight, was maintained from 1 week after birth, except at weaning, when a transient peak accompanied by Shp downregulation and Cyp7a1 upregulation was observed. An imposed weaning delay of 1 week had no effect on the time course of the BA pool size but decreased the proportion of chenodeoxycholic and {alpha}-muricholic acids, whereas the proportion of cholic acid was increased, probably as a result of Cyp8b1 upregulation. In conclusion, changes in the expression of genes involved in BA homeostasis may play a role in physiological adaptations to digestive functions during the rat life span.

Supplementary key words cholesterol • CYP7A1 • CYP8B1 • cytochrome P450 enzymes • fetus • intestine • liver • nuclear receptor • senescence • synthesis • transport • weaning

Abbreviations: Asbt, apical sodium-dependent bile acid transporter; BA, bile acid; CYP, cytochrome P450 enzymes; Ftf, fetoprotein transcription factor; Fxr, farnesoid X receptor; Hnf4{alpha}, hepatic nuclear factor 4{alpha}; Ntcp, sodium taurocholate-cotransporting polypeptide; Ost, organic solute transporter; Shp, small heterodimer partner


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Copyright © 2007 by the American Society for Biochemistry and Molecular Biology.