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Liver X receptor β and peroxisome proliferator-activated receptor δ regulate cholesterol transport in murine

Xuefeng Xia1, Dongju Jung, Paul Webb

  • 1Methodist Hospital Research Institute, Weill Cornell School of Medicine, Houston, TX 77030, USA. xxia2@tmhs.org

Hepatology (Baltimore, Md.)
|June 26, 2012
PubMed
Abstract

Insights

Nuclear receptors like liver X receptor (LXR) β and peroxisome proliferator-activated receptor (PPAR) δ regulate cholesterol transport in cholangiocytes. Their activation influences cholesterol flux, impacting liver diseases.

Area of Science:

  • Cholangiocyte biology
  • Nuclear receptor signaling
  • Cholesterol metabolism

Background:

  • Nuclear receptors (NRs) are key regulators of hepatic cholesterol homeostasis.
  • The role of NRs in cholangiocytes, the cells lining the bile ducts, remains largely unexplored.
  • Understanding cholangiocyte NR function is crucial for bile acid and cholesterol metabolism.

Purpose of the Study:

  • To investigate the expression and function of nuclear receptors in cholangiocytes.
  • To determine the role of NRs in regulating cholesterol metabolism and transport within cholangiocytes.
  • To explore the potential therapeutic implications of NR modulation in liver diseases.

Main Methods:

  • Isolation and culture of primary murine cholangiocytes.
  • Gene expression analysis of NRs and cholesterol homeostasis genes.
  • Functional assays to assess cholesterol transport and transporter regulation upon NR activation.

Main Results:

  • Cholangiocytes express specific NRs, including liver X receptor (LXR) β and peroxisome proliferator-activated receptor (PPAR) δ.
  • Activation of LXRβ and PPARδ upregulates ATP-binding cassette cholesterol transporter A1 (ABCA1), enhancing basolateral cholesterol export.
  • PPARδ activation induces Niemann-Pick C1-like L1 (NPC1L1) on the apical membrane, facilitating cholesterol import.

Conclusions:

  • LXRβ and PPARδ coordinate NPC1L1/ABCA1-dependent vectorial cholesterol flux in cholangiocytes.
  • Modulating these NR-driven pathways may offer therapeutic strategies for cholestatic and gallstone diseases.

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