PMID- 16101573 OWN - NLM STAT- MEDLINE DCOM- 20050921 LR - 20211203 IS - 1389-2002 (Print) IS - 1389-2002 (Linking) VI - 6 IP - 4 DP - 2005 Aug TI - Animal models of xenobiotic receptors. PG - 341-55 AB - Retinoid X receptors (RXRs) form heterodimers with pregnane X receptor (PXR) and constitutive androstane receptor (CAR), two prototypical xenobiotic receptors, and mediate metabolism of xenobiotics (foreign compounds) and endobiotics (endogenous compounds). Establishment of gene knockout and transgenic mouse models of RXRs, PXR, and CAR greatly enhanced the study of the biology of nuclear receptors, leading to considerable research progress in understanding the molecular mechanism underlying the nuclear receptor-mediated pathways in xenobiotic and endobiotic metabolism. These animal models are widely used in screening nuclear receptor ligands, identifying nuclear receptor target genes, and defining physiological and pharmacological pathways mediated by these xenobiotic nuclear receptors. In addition, "humanized" PXR and CAR mouse models, which avoid species specificity, provide valuable tools for investigating human xenobiotic response. Moreover, generations of multiple gene knockout mouse models further allow us to identify unique and redundant pathways mediated by each xenosensor. In this article, we review the progress made by using animal models of RXRs, PXR, and CAR in understanding the biological functions of these nuclear receptors in physiology, pharmacology, and pathology. FAU - Dai, Guoli AU - Dai G AD - Department of Pharmacology, Toxicology and Therapeutics, University of Kansas Medical Center, 3901 Rainbow Blvd., Kansas City, KS 66160, USA. FAU - Wan, Yu-Jui Yvonne AU - Wan YJ LA - eng GR - R01 CA053596/CA/NCI NIH HHS/United States GR - AA14147/AA/NIAAA NIH HHS/United States GR - CA53596/CA/NCI NIH HHS/United States GR - P20RR016475/RR/NCRR NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Research Support, U.S. Gov't, P.H.S. PT - Review PL - Netherlands TA - Curr Drug Metab JT - Current drug metabolism JID - 100960533 RN - 0 (Constitutive Androstane Receptor) RN - 0 (Pregnane X Receptor) RN - 0 (Receptors, Cytoplasmic and Nuclear) RN - 0 (Receptors, Drug) RN - 0 (Receptors, Steroid) RN - 0 (Transcription Factors) RN - 0 (Xenobiotics) SB - IM MH - Animals MH - Constitutive Androstane Receptor MH - Hepatocytes/metabolism MH - Humans MH - Mice MH - Mice, Knockout MH - Mice, Transgenic MH - Models, Biological MH - Pregnane X Receptor MH - Receptors, Cytoplasmic and Nuclear/genetics/metabolism MH - Receptors, Drug/genetics/*metabolism MH - Receptors, Steroid/genetics/metabolism MH - Transcription Factors/genetics/metabolism MH - Xenobiotics/*metabolism RF - 87 EDAT- 2005/08/17 09:00 MHDA- 2005/09/22 09:00 CRDT- 2005/08/17 09:00 PHST- 2005/08/17 09:00 [pubmed] PHST- 2005/09/22 09:00 [medline] PHST- 2005/08/17 09:00 [entrez] AID - 10.2174/1389200054633862 [doi] PST - ppublish SO - Curr Drug Metab. 2005 Aug;6(4):341-55. doi: 10.2174/1389200054633862.