title: Niemann-Pick C1 like 1 gene expression is down-regulated by LXR activators in the intestine.
abstract: Niemann-Pick C1 like 1 (NPC1L1) is a protein critical for intestinal cholesterol absorption. The nuclear receptors peroxisome proliferator-activated receptor alpha (PPARalpha) and liver X receptors (LXRalpha and LXRbeta) are major regulators of cholesterol homeostasis and their activation results in a reduced absorption of intestinal cholesterol. The goal of this study was to define the role of PPARalpha and LXR nuclear receptors in the regulation of NPC1L1 gene expression. We show that LXR activators down-regulate NPC1L1 mRNA levels in the human enterocyte cell line Caco-2/TC7, whereas PPARalpha ligands have no effect. Furthermore, NPC1L1 mRNA levels are decreased in vivo, in duodenum of mice treated with the LXR agonist T0901317. In conclusion, the present study identifies NPC1L1 as a novel LXR target gene further supporting a crucial role of LXR in intestinal cholesterol homeostasis.
authors.affiliation: Institut Pasteur de Lille, Département d'Athérosclérose, Lille F-59019, France.
authors.forename: Caroline
authors.initials: C
authors.lastname: Duval
authors.forename: Véronique
authors.initials: V
authors.lastname: Touche
authors.forename: Anne
authors.initials: A
authors.lastname: Tailleux
authors.forename: Jean-Charles
authors.initials: JC
authors.lastname: Fruchart
authors.forename: Catherine
authors.initials: C
authors.lastname: Fievet
authors.forename: Véronique
authors.initials: V
authors.lastname: Clavey
authors.forename: Bart
authors.initials: B
authors.lastname: Staels
authors.forename: Sophie
authors.initials: S
authors.lastname: Lestavel
mesh_terms: D000818:Animals; D018938:Caco-2 Cells; D004268:DNA-Binding Proteins / Q000819:agonists / Q000378:metabolism*; D015536:Down-Regulation / Q000502:physiology; D006801:Humans; D007408:Intestinal Absorption / Q000502:physiology; D007413:Intestinal Mucosa / Q000378:metabolism*; D007422:Intestines / Q000187:drug effects; D000071518:Liver X Receptors; D008562:Membrane Glycoproteins; D026901:Membrane Transport Proteins / Q000378:metabolism*; D051379:Mice; D057093:Orphan Nuclear Receptors; D047495:PPAR gamma / Q000378:metabolism*; D018160:Receptors, Cytoplasmic and Nuclear / Q000819:agonists / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D033921:Vesicular Transport Proteins
chemical_list: D004268:DNA-Binding Proteins; D000071518:Liver X Receptors; D008562:Membrane Glycoproteins; D026901:Membrane Transport Proteins; C490168:NCR1 protein, S cerevisiae; C000605213:NR1H3 protein, human; C482445:Npc1l1 protein, mouse; C000605214:Nr1h3 protein, mouse; D057093:Orphan Nuclear Receptors; D047495:PPAR gamma; D018160:Receptors, Cytoplasmic and Nuclear; D029701:Saccharomyces cerevisiae Proteins; D033921:Vesicular Transport Proteins