Activation of LXR increases acyl-CoA synthetase activity through direct regulation of ACSL3 in human placental trophoblast cells.
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.
Weedon-Fekjaer
M Susanne
MS
Faculty of Medicine, University of Oslo, and Department of Endocrinology, Oslo University Hospital, Oslo, Norway.
Dalen
Knut Tomas
KT
Solaas
Karianne
K
Staff
Anne Cathrine
AC
Duttaroy
Asim K
AK
Nebb
Hilde Irene
HI
D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D003066:Coenzyme A Ligases / Q000235:genetics / Q000378:metabolism*; D005227:Fatty Acids / Q000378:metabolism; D005260:Female; D006801:Humans; D000071518:Liver X Receptors; D046228:Microarray Analysis; D008969:Molecular Sequence Data; D057093:Orphan Nuclear Receptors / Q000819:agonists / Q000235:genetics / Q000378:metabolism*; D010920:Placenta / Q000166:cytology / Q000378:metabolism*; D011247:Pregnancy; D016415:Sequence Alignment; D014327:Trophoblasts / Q000166:cytology / Q000378:metabolism*; D000098859:Long-Chain-Fatty-Acid-CoA Ligase
D005227:Fatty Acids; D000071518:Liver X Receptors; C000605213:NR1H3 protein, human; D057093:Orphan Nuclear Receptors; D003066:Coenzyme A Ligases; D000098859:Long-Chain-Fatty-Acid-CoA Ligase