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Regulation of absorption and ABC1-mediated efflux of cholesterol by RXR heterodimers.

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Affiliations

  • 1. Howard Hughes Medical Institute and Department of Pharmacology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9050, USA.
      Authors
    • Repa JJ 1
    (1 author)

ORCIDs linked to this article

Science, 01 Sep 2000, 289(5484):1524-1529
https://doi.org/10.1126/science.289.5484.1524 PMID: 10968783 

A comment on this article appears in "Lipid research. Possible new way to lower cholesterol." Science. 2000 Sep 1;289(5484):1446-7.

Abstract 

Several nuclear hormone receptors involved in lipid metabolism form obligate heterodimers with retinoid X receptors (RXRs) and are activated by RXR agonists such as rexinoids. Animals treated with rexinoids exhibited marked changes in cholesterol balance, including inhibition of cholesterol absorption and repressed bile acid synthesis. Studies with receptor-selective agonists revealed that oxysterol receptors (LXRs) and the bile acid receptor (FXR) are the RXR heterodimeric partners that mediate these effects by regulating expression of the reverse cholesterol transporter, ABC1, and the rate-limiting enzyme of bile acid synthesis, CYP7A1, respectively. Thus, these RXR heterodimers serve as key regulators of cholesterol homeostasis by governing reverse cholesterol transport from peripheral tissues, bile acid synthesis in liver, and cholesterol absorption in intestine.

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Read article at publisher's site: https://doi.org/10.1126/science.289.5484.1524

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Funding 

Funders who supported this work.

NHLBI NIH HHS (1)