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A systematic analysis to examine the effects of peroxisome proliferator-activated receptor (PPAR)alpha agonists on the expression levels of all the nutrient/drug plasma-membrane transporters in the mouse small intestine was performed. Transporter mRNAs that were induced or repressed by two independent PPARalpha-specific agonists were identified by a genome-wide microarray method, and the changes were confirmed by real-time PCR using RNA isolated from the intestines and livers of wild-type and PPARalpha-null mice. Expression levels of seven nutrient/drug transporters (Abcd3, Octn2/Slc22a5, FATP2/Slc27a2, Slc22a21, Mct13/Slc16a13, Slc23a1 and Bcrp/Abcg2) in the intestine were up-regulated and the expression level of one (Mrp1/Abcc1) was down-regulated by PPARalpha; although the previously report that the H(+)/peptide co-transporter 1 (Pept1) is up-regulated by PPARalpha was not replicated in our study. We propose that the transport processes can be coordinately regulated with intracellular metabolism by nutrient nuclear receptors.

PPAR.ALPHA. Agonists Positively and Negatively Regulate the Expression of Several Nutrient/Drug Transporters in Mouse Small Intestine