Hydroxycarboxylic acid receptor 1

Last updated
HCAR1
Identifiers
Aliases HCAR1 , GPR104, GPR81, HCA1, LACR1, TA-GPCR, TAGPCR, FKSG80, hydroxycarboxylic acid receptor 1
External IDs OMIM: 606923 MGI: 2441671 HomoloGene: 13060 GeneCards: HCAR1
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_032554

NM_175520

RefSeq (protein)

NP_115943

NP_780729

Location (UCSC) Chr 12: 122.73 – 122.73 Mb Chr 5: 124.01 – 124.02 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

Hydroxycarboxylic acid receptor 1 (HCA1), formerly known as G protein-coupled receptor 81 (GPR81), is a protein that in humans is encoded by the HCAR1 gene. [5] [6] HCA1, like the other hydroxycarboxylic acid receptors HCA2 and HCA3, is a Gi/o-coupled G protein-coupled receptor (GPCR). [7] [8] The primary endogenous agonist of HCA1 is lactic acid (and its conjugate base, lactate). [7] [8] More recently, 3,5-dihydroxybenzoic acid has been reported to activate HCA1. [9]

Lactate was initially found to activate HCA1 on fat cells and thereby to inhibit these cells lipolysis i.e., break-down of their fats into free fatty acids and glycerol. [10] [11] Subsequent studies have found that in addition to fat cells, HCA1 is expressed on cells in the brain, skeletal muscle, lymphoid tissue, uterus, kidney, liver, and pancreas as well as on immune cells such as macrophages and antigen-presenting cells. In the brain, HCA1 acts to dampen neuron excitation and may also function to promote neurogenesis (i.e., production of neurons from neural stem cells) and angiogenesis, i.e., formation of new blood vessels from pre-existing blood vessels). The functions of HCA1 in non-fat and non-neural tissues have not been fully defined but in many cases appear to involve promoting the survival of cells, including various types of cancer cells. [12]

Related Research Articles

<span class="mw-page-title-main">Lactic acid</span> Group of stereoisomers

Lactic acid is an organic acid. It has the molecular formula CH3CH(OH)COOH. It is white in the solid state and it is miscible with water. When in the dissolved state, it forms a colorless solution. Production includes both artificial synthesis as well as natural sources. Lactic acid is an alpha-hydroxy acid (AHA) due to the presence of a hydroxyl group adjacent to the carboxyl group. It is used as a synthetic intermediate in many organic synthesis industries and in various biochemical industries. The conjugate base of lactic acid is called lactate. The name of the derived acyl group is lactoyl.

<span class="mw-page-title-main">Butyric acid</span> Chemical compound

Butyric acid, also known under the systematic name butanoic acid, is a straight-chain alkyl carboxylic acid with the chemical formula CH3CH2CH2CO2H. It is an oily, colorless liquid with an unpleasant odor. Isobutyric acid is an isomer. Salts and esters of butyric acid are known as butyrates or butanoates. The acid does not occur widely in nature, but its esters are widespread. It is a common industrial chemical and an important component in the mammalian gut.

Adenosine A<sub>1</sub> receptor Cell surface receptor found in humans

The adenosine A1 receptor (A1AR) is one member of the adenosine receptor group of G protein-coupled receptors with adenosine as endogenous ligand.

β-Hydroxybutyric acid Chemical compound

β-Hydroxybutyric acid, also known as 3-hydroxybutyric acid or BHB, is an organic compound and a beta hydroxy acid with the chemical formula CH3CH(OH)CH2CO2H; its conjugate base is β-hydroxybutyrate, also known as 3-hydroxybutyrate. β-Hydroxybutyric acid is a chiral compound with two enantiomers: D-β-hydroxybutyric acid and L-β-hydroxybutyric acid. Its oxidized and polymeric derivatives occur widely in nature. In humans, D-β-hydroxybutyric acid is one of two primary endogenous agonists of hydroxycarboxylic acid receptor 2 (HCA2), a Gi/o-coupled G protein-coupled receptor (GPCR).

Free fatty acid receptors (FFARs) are G-protein coupled receptors (GPRs). GPRs are a large protein family of receptors. They reside on their parent cells' surface membranes, bind any one of a specific set of ligands that they recognize, and thereby are activated to elicit certain types of responses in their parent cells. Humans have >800 different types of GPCR receptors. The FFARs are GPCR receptors that bind and thereby are activated by particular fatty acids. In general, these binding/activating fatty acids are straight-chain fatty acids consisting of a carboxylic acid residue, i.e., -COOH, attached to aliphatic chains, i.e. carbon atom chains of varying lengths and bound to 1, 2 or 3 hydrogens. For example, propionic acid is short-chain fatty acid consisting of 3 carbons (C's), CH3-CH2-COOH, and docosahexaenoic acid is long chain polyunsaturated fatty acid consisting of 22 C's and six double bonds : CH3-CH2-CH1=CH1-CH2-CH1=CH1-CH2-CH1=CH1-CH2-CH1=CH1-CH2-CH1=CH1-CH2-CH1=CH1-CH2-CH2-COOH.

<span class="mw-page-title-main">G protein-coupled bile acid receptor</span> Protein-coding gene in the species Homo sapiens

The G protein-coupled bile acid receptor 1 (GPBAR1) also known G-protein coupled receptor 19 (GPCR19), membrane-type receptor for bile acids (M-BAR) or Takeda G protein-coupled receptor 5 (TGR5) as is a protein that in humans is encoded by the GPBAR1 gene.

<span class="mw-page-title-main">GNAQ</span> Protein-coding gene in the species Homo sapiens

Guanine nucleotide-binding protein G(q) subunit alpha is a protein that in humans is encoded by the GNAQ gene. Together with GNA11, it functions as a Gq alpha subunit.

<span class="mw-page-title-main">GNAI1</span> Protein-coding gene in humans

Guanine nucleotide-binding protein G(i), alpha-1 subunit is a protein that in humans is encoded by the GNAI1 gene.

<span class="mw-page-title-main">Free fatty acid receptor 3</span> Protein-coding gene in the species Homo sapiens

Free fatty acid receptor 3 protein is a G protein coupled receptor that in humans is encoded by the FFAR3 gene. GPRs reside on cell surfaces, bind specific signaling molecules, and thereby are activated to trigger certain functional responses in their parent cells. FFAR3 is a member of the free fatty acid receptor group of GPRs that includes FFAR1, FFAR2, and FFAR4. All of these FFARs are activated by fatty acids. FFAR3 and FFAR2 are activated by certain short-chain fatty acids (SC-FAs), i.e., fatty acids consisting of 2 to 6 carbon atoms whereas FFFAR1 and FFAR4 are activated by certain fatty acids that are 6 to more than 21 carbon atoms long. Hydroxycarboxylic acid receptor 2 is also activated by a SC-FA that activate FFAR3, i.e., butyric acid.

<span class="mw-page-title-main">Free fatty acid receptor 2</span> Protein-coding gene in the species Homo sapiens

Free fatty acid receptor 2 (FFAR2), also termed G-protein coupled receptor 43 (GPR43), is a rhodopsin-like G-protein coupled receptor. It is coded by the FFAR2 gene. In humans, the FFAR2 gene is located on the long arm of chromosome 19 at position 13.12. Like other GPCRs, FFAR2s reside on the surface membrane of cells and when bond to one of their activating ligands regulate the function of their parent cells. FFAR2 is a member of a small family of structurally and functionally related GPRs termed free fatty acid receptors (FFARs). This family includes three other receptors which, like FFAR2, are activated by certain fatty acids: FFAR1, FFAR3 (GPR41), and FFAR4 (GPR120). FFAR2 and FFAR3 are activated by short-chain fatty acids whereas FFAR1 and FFAR4 are activated by long-chain fatty acids.

<span class="mw-page-title-main">GPR65</span> Protein-coding gene in the species Homo sapiens

Psychosine receptor is a G protein-coupled receptor (GPCR) protein that in humans is encoded by the GPR65 gene. GPR65 is also referred to as TDAG8.

<span class="mw-page-title-main">Hydroxycarboxylic acid receptor 3</span> Protein-coding gene in the species Homo sapiens

Hydroxycarboxylic acid receptor 3 (HCA3), also known as niacin receptor 2 (NIACR2) and GPR109B, is a protein which in humans is encoded by the HCAR3 gene. HCA3, like the other hydroxycarboxylic acid receptors HCA1 and HCA2, is a Gi/o-coupled G protein-coupled receptor (GPCR). The primary endogenous agonists of HCA3 are 3-hydroxyoctanoic acid and kynurenic acid. HCA3 is also a low-affinity biomolecular target for niacin (aka nicotinic acid).

<span class="mw-page-title-main">Relaxin/insulin-like family peptide receptor 1</span> Protein-coding gene in the species Homo sapiens

Relaxin/insulin-like family peptide receptor 1, also known as RXFP1, is a human G protein coupled receptor that is one of the relaxin receptors. It is a rhodopsin-like GPCR which is unusual in this class as it contains a large extracellular binding and signalling domain. Some reports suggest that RXFP1 forms homodimers, however the most recent evidence indicates that relaxin binds a non-homodimer of RXFP1.

<span class="mw-page-title-main">Hydroxycarboxylic acid receptor 2</span> Protein-coding gene in the species Homo sapiens

Hydroxycarboxylic acid receptor 2 (HCA2), also known as GPR109A and niacin receptor 1 (NIACR1), is a protein which in humans is encoded (its formation is directed) by the HCAR2 gene and in rodents by the Hcar2 gene. The human HCAR2 gene is located on the long (i.e., "q") arm of chromosome 12 at position 24.31 (notated as 12q24.31). Like the two other hydroxycarboxylic acid receptors, HCA1 and HCA3, HCA2 is a G protein-coupled receptor (GPCR) located on the surface membrane of cells. HCA2 binds and thereby is activated by D-β-hydroxybutyric acid (hereafter termed β-hydroxybutyric acid), butyric acid, and niacin (also known as nicotinic acid). β-Hydroxybutyric and butyric acids are regarded as the endogenous agents that activate HCA2. Under normal conditions, niacin's blood levels are too low to do so: it is given as a drug in high doses in order to reach levels that activate HCA2.

<span class="mw-page-title-main">Relaxin/insulin-like family peptide receptor 4</span> Protein-coding gene in the species Homo sapiens

Relaxin/insulin-like family peptide receptor 4, also known as RXFP4, is a human G-protein coupled receptor.

<span class="mw-page-title-main">Oxoeicosanoid receptor 1</span> Protein-coding gene in the species Homo sapiens

Oxoeicosanoid receptor 1 (OXER1) also known as G-protein coupled receptor 170 (GPR170) is a protein that in humans is encoded by the OXER1 gene located on human chromosome 2p21; it is the principal receptor for the 5-Hydroxyicosatetraenoic acid family of carboxy fatty acid metabolites derived from arachidonic acid. The receptor has also been termed hGPCR48, HGPCR48, and R527 but OXER1 is now its preferred designation. OXER1 is a G protein-coupled receptor (GPCR) that is structurally related to the hydroxy-carboxylic acid (HCA) family of G protein-coupled receptors whose three members are HCA1 (GPR81), HCA2, and HCA3 ; OXER1 has 30.3%, 30.7%, and 30.7% amino acid sequence identity with these GPCRs, respectively. It is also related to the recently defined receptor, GPR31, for the hydroxyl-carboxy fatty acid 12-HETE.

<span class="mw-page-title-main">LPAR3</span> Protein-coding gene in the species Homo sapiens

Lysophosphatidic acid receptor 3 also known as LPA3 is a protein that in humans is encoded by the LPAR3 gene. LPA3 is a G protein-coupled receptor that binds the lipid signaling molecule lysophosphatidic acid (LPA).

<span class="mw-page-title-main">Chemerin</span> Protein-coding gene in the species Homo sapiens

Chemerin, also known as retinoic acid receptor responder protein 2 (RARRES2), tazarotene-induced gene 2 protein (TIG2), or RAR-responsive protein TIG2 is a protein that in humans is encoded by the RARRES2 gene.

<span class="mw-page-title-main">3-Hydroxyoctanoic acid</span> Chemical compound

3-Hydroxyoctanoic acid is a beta-hydroxy acid that is naturally produced in humans, other animals, and plants.

The hydroxycarboxylic acid receptor (abbreviated HCA receptor and HCAR) family includes the following human proteins:

References

  1. 1 2 3 GRCh38: Ensembl release 89: ENSG00000196917 - Ensembl, May 2017
  2. 1 2 3 GRCm38: Ensembl release 89: ENSMUSG00000049241 - Ensembl, May 2017
  3. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. "Entrez Gene: GPR81 G protein-coupled receptor 81".
  6. Lee DK, Nguyen T, Lynch KR, Cheng R, Vanti WB, Arkhitko O, Lewis T, Evans JF, George SR, O'Dowd BF (September 2001). "Discovery and mapping of ten novel G protein-coupled receptor genes". Gene. 275 (1): 83–91. doi:10.1016/S0378-1119(01)00651-5. PMID   11574155.
  7. 1 2 Offermanns S, Colletti SL, Lovenberg TW, Semple G, Wise A, IJzerman AP (June 2011). "International Union of Basic and Clinical Pharmacology. LXXXII: Nomenclature and Classification of Hydroxy-carboxylic Acid Receptors (GPR81, GPR109A, and GPR109B)". Pharmacological Reviews. 63 (2): 269–90. doi: 10.1124/pr.110.003301 . PMID   21454438.
  8. 1 2 S Offermanns, SL Colletti, AP IJzerman, TW Lovenberg, G Semple, A Wise, MG Waters. "Hydroxycarboxylic acid receptors". IUPHAR/BPS Guide to Pharmacology. International Union of Basic and Clinical Pharmacology. Retrieved 13 July 2018.{{cite web}}: CS1 maint: multiple names: authors list (link)
  9. Wagner W, Sobierajska K, Pułaski Ł, Stasiak A, Ciszewski WM (April 2023). "Whole grain metabolite 3,5-dihydroxybenzoic acid is a beneficial nutritional molecule with the feature of a double-edged sword in human health: a critical review and dietary considerations". Critical Reviews in Food Science and Nutrition: 1–19. doi:10.1080/10408398.2023.2203762. PMID   37096487.
  10. Liu C, Wu J, Zhu J, Kuei C, Yu J, Shelton J, Sutton SW, Li X, Yun SJ, Mirzadegan T, Mazur C, Kamme F, Lovenberg TW (January 2009). "Lactate inhibits lipolysis in fat cells through activation of an orphan G-protein-coupled receptor, GPR81". The Journal of Biological Chemistry. 284 (5): 2811–22. doi: 10.1074/jbc.M806409200 . PMID   19047060.
  11. Cai TQ, Ren N, Jin L, Cheng K, Kash S, Chen R, Wright SD, Taggart AK, Waters MG (December 2008). "Role of GPR81 in lactate-mediated reduction of adipose lipolysis". Biochemical and Biophysical Research Communications. 377 (3): 987–91. doi:10.1016/j.bbrc.2008.10.088. PMID   18952058.
  12. Colucci AC, Tassinari ID, Loss ED, de Fraga LS (June 2023). "History and Function of the Lactate Receptor GPR81/HCAR1 in the Brain: A Putative Therapeutic Target for the Treatment of Cerebral Ischemia". Neuroscience. 526: 144–163. doi:10.1016/j.neuroscience.2023.06.022. PMID   37391123.

Further reading