Activation of LXR increases acyl-CoA synthetase activity through direct regulation of ACSL3 in human placental trophoblast cells

J Lipid Res. 2010 Jul;51(7):1886-96. doi: 10.1194/jlr.M004978. Epub 2010 Mar 10.

Abstract

Placental fatty acid transport and metabolism are important for proper growth and development of the feto-placental unit. The nuclear receptors, liver X receptors alpha and beta (LXRalpha and LXRbeta), are key regulators of lipid metabolism in many tissues, but little is known about their role in fatty acid transport and metabolism in placenta. The current study investigates the LXR-mediated regulation of long-chain acyl-CoA synthetase 3 (ACSL3) and its functions in human placental trophoblast cells. We demonstrate that activation of LXR increases ACSL3 expression, acyl-CoA synthetase activity, and fatty acid uptake in human tropholast cells. Silencing of ACSL3 in these cells attenuates the LXR-mediated increase in acyl-CoA synthetase activity. Furthermore, we show that ACSL3 is directly regulated by LXR through a conserved LXR responsive element in the ACSL3 promoter. Our results suggest that LXR plays a regulatory role in fatty acid metabolism by direct regulation of ACSL3 in human placental trophoblast cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Base Sequence
  • Cell Line
  • Coenzyme A Ligases / genetics
  • Coenzyme A Ligases / metabolism*
  • Fatty Acids / metabolism
  • Female
  • Humans
  • Liver X Receptors
  • Microarray Analysis
  • Molecular Sequence Data
  • Orphan Nuclear Receptors / agonists
  • Orphan Nuclear Receptors / genetics
  • Orphan Nuclear Receptors / metabolism*
  • Placenta / cytology
  • Placenta / metabolism*
  • Pregnancy
  • Sequence Alignment
  • Trophoblasts / cytology
  • Trophoblasts / metabolism*

Substances

  • Fatty Acids
  • Liver X Receptors
  • NR1H3 protein, human
  • Orphan Nuclear Receptors
  • Coenzyme A Ligases
  • long-chain-fatty-acid-CoA ligase