Functional crosstalk of CAR-LXR and ROR-LXR in drug metabolism and lipid metabolism.
Nuclear receptor crosstalk represents an important mechanism to expand the functions of individual receptors. The liver X receptors (LXR, NR1H2/3), both the α and β isoforms, are nuclear receptors that can be activated by the endogenous oxysterols and other synthetic agonists. LXRs function as cholesterol sensors, which protect mammals from cholesterol overload. LXRs have been shown to regulate the expression of a battery of metabolic genes, especially those involved in lipid metabolism. LXRs have recently been suggested to play a novel role in the regulation of drug metabolism. The constitutive androstane receptor (CAR, NR1I3) is a xenobiotic receptor that regulates the expression of drug-metabolizing enzymes and transporters. Disruption of CAR alters sensitivity to toxins, increasing or decreasing it depending on the compounds. More recently, additional roles for CAR have been discovered. These include the involvement of CAR in lipid metabolism. Mechanistically, CAR forms an intricate regulatory network with other members of the nuclear receptor superfamily, foremost the LXRs, in exerting its effect on lipid metabolism. Retinoid-related orphan receptors (RORs, NR1F1/2/3) have three isoforms, α, β and γ. Recent reports have shown that loss of RORα and/or RORγ can positively or negatively influence the expression of multiple drug-metabolizing enzymes and transporters in the liver. The effects of RORs on expression of drug-metabolizing enzymes were reasoned to be, at least in part, due to the crosstalk with LXR. This review focuses on the CAR-LXR and ROR-LXR crosstalk, and the implications of this crosstalk in drug metabolism and lipid metabolism.
Xiao
Lei
L
Key Laboratory for Cell Proliferation and Regulation Biology, Ministry of Education, Biomedicine Research Institute and College of Life Sciences, Beijing Normal University,Beijing 100875, China.
Xie
Xinni
X
Zhai
Yonggong
Y
D000818:Animals; D000090702:Constitutive Androstane Receptor; D006801:Humans; D008658:Inactivation, Metabolic; D050356:Lipid Metabolism; D008099:Liver / Q000378:metabolism; D000071518:Liver X Receptors; D051379:Mice; D018345:Mice, Knockout; D058990:Molecular Targeted Therapy; D057094:Nuclear Receptor Subfamily 1, Group F, Member 1 / Q000235:genetics / Q000378:metabolism*; D057095:Nuclear Receptor Subfamily 1, Group F, Member 2 / Q000235:genetics / Q000378:metabolism*; D057093:Orphan Nuclear Receptors / Q000235:genetics / Q000378:metabolism*; D020033:Protein Isoforms / Q000378:metabolism; D018160:Receptors, Cytoplasmic and Nuclear / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D015262:Xenobiotics / Q000378:metabolism*
D000090702:Constitutive Androstane Receptor; D000071518:Liver X Receptors; C000605210:NR1H2 protein, human; C000716327:NR1I3 protein, human; C000605211:Nr1h2 protein, mouse; C000716328:Nr1i3 protein, mouse; D057094:Nuclear Receptor Subfamily 1, Group F, Member 1; D057095:Nuclear Receptor Subfamily 1, Group F, Member 2; D057093:Orphan Nuclear Receptors; D020033:Protein Isoforms; D018160:Receptors, Cytoplasmic and Nuclear; D015262:Xenobiotics