Liver X receptor alpha

NR1H3
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 1UHL, 3IPQ, 3IPS, 3IPU, 5AVI, 5AVL, 5HJS
Identifiers
Aliases	NR1H3, LXR-a, LXRA, RLD-1, Liver X receptor alpha, nuclear receptor subfamily 1 group H member 3
External IDs	OMIM: 602423; MGI: 1352462; HomoloGene: 21165; GeneCards: NR1H3; OMA:NR1H3 - orthologs
Gene location (Human) Chr. Chromosome 11 (human) Band 11p11.2 Start 47,248,300 bp End 47,269,032 bp
Gene location (Mouse) Chr. Chromosome 2 (mouse) Band 2 E1|2 50.52 cM Start 91,014,406 bp End 91,033,179 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in right lobe of liver mucosa of transverse colon spleen tibial nerve subcutaneous adipose tissue canal of the cervix gallbladder lymph node right lobe of thyroid gland right adrenal cortex Top expressed in right kidney left lobe of liver Ileal epithelium muscle of thigh lactiferous gland proximal tubule brown adipose tissue white adipose tissue subcutaneous adipose tissue duodenum More reference expression data BioGPS More reference expression data
Gene ontology Molecular function cholesterol binding protein binding zinc ion binding nuclear receptor activity sterol response element binding steroid hormone receptor activity DNA binding sequence-specific DNA binding metal ion binding DNA-binding transcription factor activity DNA-binding transcription factor activity, RNA polymerase II-specific transcription coactivator activity transcription cis-regulatory region binding RNA polymerase II transcription regulatory region sequence-specific DNA binding transcription factor binding nuclear receptor coactivator activity signaling receptor activity Cellular component receptor complex nucleoplasm RNA polymerase II transcription regulator complex nucleus cytoplasm Biological process positive regulation of toll-like receptor 4 signaling pathway sterol homeostasis negative regulation of pancreatic juice secretion negative regulation of inflammatory response cellular response to lipopolysaccharide negative regulation of lipid transport positive regulation of lipoprotein lipase activity lipid homeostasis triglyceride homeostasis negative regulation of macrophage activation negative regulation of macrophage derived foam cell differentiation positive regulation of cholesterol transport negative regulation of cholesterol storage regulation of transcription, DNA-templated positive regulation of triglyceride biosynthetic process positive regulation of cholesterol efflux positive regulation of protein metabolic process negative regulation of interferon-gamma-mediated signaling pathway regulation of circadian rhythm transcription, DNA-templated negative regulation of transcription by RNA polymerase II response to progesterone steroid hormone mediated signaling pathway apoptotic cell clearance positive regulation of fatty acid biosynthetic process transcription initiation from RNA polymerase II promoter positive regulation of transcription by RNA polymerase II negative regulation of secretion of lysosomal enzymes negative regulation of pinocytosis positive regulation of transcription, DNA-templated intracellular receptor signaling pathway cholesterol homeostasis lipid metabolism multicellular organism development cell differentiation negative regulation of cold-induced thermogenesis Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 10062 22259 Ensembl ENSG00000025434 ENSMUSG00000002108 UniProt Q13133 Q9Z0Y9 RefSeq (mRNA) NM_001130101 NM_001130102 NM_001251934 NM_001251935 NM_005693 NM_001177730 NM_013839 NM_001355279 RefSeq (protein) NP_001123573 NP_001123574 NP_001238863 NP_001238864 NP_005684 NP_001350524 NP_005684.2 NP_001171201 NP_038867 NP_001342208 Location (UCSC) Chr 11: 47.25 – 47.27 Mb Chr 2: 91.01 – 91.03 Mb PubMed search
Wikidata
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Liver X receptor alpha (LXR-alpha) is a nuclear receptor protein that in humans is encoded by the NR1H3 gene (nuclear receptor subfamily 1, group H, member 3).

Expression

miRNA hsa-miR-613 autoregulates the human LXRα gene by targeting the endogenous LXRα through its specific miRNA response element (613MRE) within the LXRα 3′-untranslated region. LXRα autoregulates its own suppression via induction of SREBP1c which upregulates miRNA has-miR-613.

Function

The liver X receptors, LXRα (this protein) and LXRβ, form a subfamily of the nuclear receptor superfamily and are key regulators of macrophage function, controlling transcriptional programs involved in lipid homeostasis and inflammation. Additionally, they play an important role in the local activation of thyroid hormones via deiodinases. The inducible LXRα is highly expressed in liver, adrenal gland, intestine, adipose tissue, macrophages, lung, and kidney, whereas LXRβ is ubiquitously expressed. Ligand-activated LXRs form obligate heterodimers with retinoid X receptors (RXRs) and regulate expression of target genes containing LXR response elements. Restoration of LXR-alpha expression/function within a psoriatic lesion may help to switch the transition from psoriatic to symptomless skin.

Interactions

Liver X receptor alpha has been shown to interact with EDF1 and small heterodimer partner. LXRα activates the transcription factor SREBP-1c, resulting in lipogenesis.

Link to multiple sclerosis

In 2016, a study found 70% of individuals in two families with a rare form of rapidly progressing multiple sclerosis had a mutation in NR1H3. However, an analysis from The International Multiple Sclerosis Genetics Consortium using a 13-fold larger sample size could not find any evidence that the mutation in question (p.Arg415Gln) associated with multiple sclerosis, refuting these findings.

Further reading

• Lehmann JM, Kliewer SA, Moore LB, Smith-Oliver TA, Oliver BB, Su JL, et al. (Feb 1997). "Activation of the nuclear receptor LXR by oxysterols defines a new hormone response pathway". The Journal of Biological Chemistry. 272 (6): 3137–40. doi:10.1074/jbc.272.6.3137. PMID 9013544.
• Auboeuf D, Rieusset J, Fajas L, Vallier P, Frering V, Riou JP, et al. (Aug 1997). "Tissue distribution and quantification of the expression of mRNAs of peroxisome proliferator-activated receptors and liver X receptor-alpha in humans: no alteration in adipose tissue of obese and NIDDM patients". Diabetes. 46 (8): 1319–27. doi:10.2337/diabetes.46.8.1319. PMID 9231657.
• Peet DJ, Turley SD, Ma W, Janowski BA, Lobaccaro JM, Hammer RE, et al. (May 1998). "Cholesterol and bile acid metabolism are impaired in mice lacking the nuclear oxysterol receptor LXR alpha". Cell. 93 (5): 693–704. doi:10.1016/S0092-8674(00)81432-4. PMID 9630215. S2CID 5856580.
• Miyata KS, McCaw SE, Meertens LM, Patel HV, Rachubinski RA, Capone JP (Nov 1998). "Receptor-interacting protein 140 interacts with and inhibits transactivation by, peroxisome proliferator-activated receptor alpha and liver-X-receptor alpha". Molecular and Cellular Endocrinology. 146 (1–2): 69–76. doi:10.1016/S0303-7207(98)00196-8. PMID 10022764. S2CID 53253694.
• Venkateswaran A, Laffitte BA, Joseph SB, Mak PA, Wilpitz DC, Edwards PA, et al. (Oct 2000). "Control of cellular cholesterol efflux by the nuclear oxysterol receptor LXR alpha". Proceedings of the National Academy of Sciences of the United States of America. 97 (22): 12097–102. Bibcode:2000PNAS...9712097V. doi:10.1073/pnas.200367697. PMC 17300. PMID 11035776.
• Chinetti G, Lestavel S, Bocher V, Remaley AT, Neve B, Torra IP, et al. (Jan 2001). "PPAR-alpha and PPAR-gamma activators induce cholesterol removal from human macrophage foam cells through stimulation of the ABCA1 pathway". Nature Medicine. 7 (1): 53–8. doi:10.1038/83348. PMID 11135616. S2CID 20558311.
• Laffitte BA, Repa JJ, Joseph SB, Wilpitz DC, Kast HR, Mangelsdorf DJ, et al. (Jan 2001). "LXRs control lipid-inducible expression of the apolipoprotein E gene in macrophages and adipocytes". Proceedings of the National Academy of Sciences of the United States of America. 98 (2): 507–12. doi:10.1073/pnas.021488798. PMC 14617. PMID 11149950.
• Li Y, Bolten C, Bhat BG, Woodring-Dietz J, Li S, Prayaga SK, et al. (Mar 2002). "Induction of human liver X receptor alpha gene expression via an autoregulatory loop mechanism". Molecular Endocrinology. 16 (3): 506–14. doi:10.1210/mend.16.3.0789. PMID 11875109.
• Mak PA, Laffitte BA, Desrumaux C, Joseph SB, Curtiss LK, Mangelsdorf DJ, et al. (Aug 2002). "Regulated expression of the apolipoprotein E/C-I/C-IV/C-II gene cluster in murine and human macrophages. A critical role for nuclear liver X receptors alpha and beta". The Journal of Biological Chemistry. 277 (35): 31900–8. doi:10.1074/jbc.M202993200. PMID 12032151.
• Brendel C, Gelman L, Auwerx J (Jun 2002). "Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuclear receptors that regulate lipid metabolism". Molecular Endocrinology. 16 (6): 1367–77. doi:10.1210/mend.16.6.0843. PMID 12040021.
• Steffensen KR, Schuster GU, Parini P, Holter E, Sadek CM, Cassel T, et al. (May 2002). "Different regulation of the LXRalpha promoter activity by isoforms of CCAAT/enhancer-binding proteins". Biochemical and Biophysical Research Communications. 293 (5): 1333–40. doi:10.1016/S0006-291X(02)00390-X. PMID 12054659.
• Gbaguidi GF, Agellon LB (Jul 2002). "The atypical interaction of peroxisome proliferator-activated receptor alpha with liver X receptor alpha antagonizes the stimulatory effect of their respective ligands on the murine cholesterol 7alpha-hydroxylase gene promoter". Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids. 1583 (2): 229–36. doi:10.1016/s1388-1981(02)00217-2. PMID 12117567.
• Pawar A, Xu J, Jerks E, Mangelsdorf DJ, Jump DB (Oct 2002). "Fatty acid regulation of liver X receptors (LXR) and peroxisome proliferator-activated receptor alpha (PPARalpha ) in HEK293 cells". The Journal of Biological Chemistry. 277 (42): 39243–50. doi:10.1074/jbc.M206170200. PMID 12161442.
• Brendel C, Schoonjans K, Botrugno OA, Treuter E, Auwerx J (Sep 2002). "The small heterodimer partner interacts with the liver X receptor alpha and represses its transcriptional activity". Molecular Endocrinology. 16 (9): 2065–76. doi:10.1210/me.2001-0194. PMID 12198243.
• Oberkofler H, Schraml E, Krempler F, Patsch W (Apr 2003). "Potentiation of liver X receptor transcriptional activity by peroxisome-proliferator-activated receptor gamma co-activator 1 alpha". The Biochemical Journal. 371 (Pt 1): 89–96. doi:10.1042/BJ20021665. PMC 1223253. PMID 12470296.
• Wang M, Thomas J, Burris TP, Schkeryantz J, Michael LF (Nov 2003). "Molecular determinants of LXRalpha agonism". Journal of Molecular Graphics & Modelling. 22 (2): 173–81. doi:10.1016/S1093-3263(03)00159-1. PMID 12932788.
• Fukuchi J, Song C, Ko AL, Liao S (Sep 2003). "Transcriptional regulation of farnesyl pyrophosphate synthase by liver X receptors". Steroids. 68 (7–8): 685–91. doi:10.1016/S0039-128X(03)00100-4. PMID 12957674. S2CID 6023862.

External links

• NR1H3 human gene location in the UCSC Genome Browser.
• NR1H3 human gene details in the UCSC Genome Browser.

This article incorporates text from the United States National Library of Medicine, which is in the public domain.