Muscarinic acetylcholine receptor M2

Cholinergic receptor, muscarinic 2
Identifiers
Symbols	CHRM2 ; FLJ43243; HM2; MGC120006; MGC120007
External IDs	Template:OMIM5 Template:MGI HomoloGene: 20190
Gene ontology Molecular function Template:GNF GO Template:GNF GO Template:GNF GO Cellular component Template:GNF GO Template:GNF GO Template:GNF GO Biological process Template:GNF GO Template:GNF GO Template:GNF GO Template:GNF GO Template:GNF GO Template:GNF GO Template:GNF GO
Orthologs
Template:GNF Ortholog box
Species	Human	Mouse
Entrez	n/a	n/a
Ensembl	n/a	n/a
UniProt	n/a	n/a
RefSeq (mRNA)	n/a	n/a
RefSeq (protein)	n/a	n/a
Location (UCSC)	n/a	n/a
PubMed search	n/a	n/a

The muscarinic acetylcholine receptor M₂, also known as the cholinergic receptor, muscarinic 2, is a muscarinic acetylcholine receptor.

Function

The M2 muscarinic receptors are located in the heart, where they act to slow the heart rate down to normal sinus rhythm after stimulatory actions of the sympathetic nervous system, by slowing the speed of depolarization. They also reduce contractile forces of the atrial cardiac muscle, and reduce conduction velocity of the atrioventricular node (AV node). However, they have no effect on the contractile forces of the ventricular muscle.

Mechanism

M2 muscarinic receptors act via a G_i type receptor, which causes a decrease in cAMP in the cell, generally leading to inhibitory-type effects.

In addition, they modulate muscarinic potassium channels. In the heart, this contributes to a decreased heart rate.

Gene

Muscarinic acetylcholine receptor M2 is encoded by the gene CHRM2.

Multiple alternatively spliced transcript variants have been described for this gene.

See also

• Muscarinic acetylcholine receptor

Further reading

• Goyal RK (1989). "Muscarinic receptor subtypes. Physiology and clinical implications". N. Engl. J. Med. 321 (15): 1022–9. PMID 2674717.
• Brann MR, Ellis J, Jørgensen H; et al. (1994). "Muscarinic acetylcholine receptor subtypes: localization and structure/function". Prog. Brain Res. 98: 121–7. PMID 8248499.CS1 maint: Explicit use of et al. (link) CS1 maint: Multiple names: authors list (link)
• van Koppen CJ, Nathanson NM (1991). "Site-directed mutagenesis of the m2 muscarinic acetylcholine receptor. Analysis of the role of N-glycosylation in receptor expression and function". J. Biol. Chem. 265 (34): 20887–92. PMID 2249995.
• Ashkenazi A, Ramachandran J, Capon DJ (1989). "Acetylcholine analogue stimulates DNA synthesis in brain-derived cells via specific muscarinic receptor subtypes". Nature. 340 (6229): 146–50. doi:10.1038/340146a0. PMID 2739737.CS1 maint: Multiple names: authors list (link)
• Bonner TI, Buckley NJ, Young AC, Brann MR (1987). "Identification of a family of muscarinic acetylcholine receptor genes". Science. 237 (4814): 527–32. PMID 3037705.CS1 maint: Multiple names: authors list (link)
• Peralta EG, Ashkenazi A, Winslow JW; et al. (1988). "Distinct primary structures, ligand-binding properties and tissue-specific expression of four human muscarinic acetylcholine receptors". EMBO J. 6 (13): 3923–9. PMID 3443095.CS1 maint: Explicit use of et al. (link) CS1 maint: Multiple names: authors list (link)
• Badner JA, Yoon SW, Turner G; et al. (1995). "Multipoint genetic linkage analysis of the m2 human muscarinic receptor gene". Mamm. Genome. 6 (7): 489–90. PMID 7579899.CS1 maint: Explicit use of et al. (link) CS1 maint: Multiple names: authors list (link)
• Offermanns S, Simon MI (1995). "G alpha 15 and G alpha 16 couple a wide variety of receptors to phospholipase C.". J. Biol. Chem. 270 (25): 15175–80. PMID 7797501.
• Russell M, Winitz S, Johnson GL (1994). "Acetylcholine muscarinic m1 receptor regulation of cyclic AMP synthesis controls growth factor stimulation of Raf activity". Mol. Cell. Biol. 14 (4): 2343–51. PMID 8139539.CS1 maint: Multiple names: authors list (link)
• Kunapuli P, Onorato JJ, Hosey MM, Benovic JL (1994). "Expression, purification, and characterization of the G protein-coupled receptor kinase GRK5". J. Biol. Chem. 269 (2): 1099–105. PMID 8288567.CS1 maint: Multiple names: authors list (link)
• Haga K, Kameyama K, Haga T; et al. (1996). "Phosphorylation of human m1 muscarinic acetylcholine receptors by G protein-coupled receptor kinase 2 and protein kinase C.". J. Biol. Chem. 271 (5): 2776–82. PMID 8576254.CS1 maint: Explicit use of et al. (link) CS1 maint: Multiple names: authors list (link)
• Kostenis E, Conklin BR, Wess J (1997). "Molecular basis of receptor/G protein coupling selectivity studied by coexpression of wild type and mutant m2 muscarinic receptors with mutant G alpha(q) subunits". Biochemistry. 36 (6): 1487–95. doi:10.1021/bi962554d. PMID 9063897.CS1 maint: Multiple names: authors list (link)
• Smiley JF, Levey AI, Mesulam MM (1998). "Infracortical interstitial cells concurrently expressing m2-muscarinic receptors, acetylcholinesterase and nicotinamide adenine dinucleotide phosphate-diaphorase in the human and monkey cerebral cortex". Neuroscience. 84 (3): 755–69. PMID 9579781.CS1 maint: Multiple names: authors list (link)
• von der Kammer H, Mayhaus M, Albrecht C; et al. (1998). "Muscarinic acetylcholine receptors activate expression of the EGR gene family of transcription factors". J. Biol. Chem. 273 (23): 14538–44. PMID 9603968.CS1 maint: Explicit use of et al. (link) CS1 maint: Multiple names: authors list (link)
• Sato KZ, Fujii T, Watanabe Y; et al. (1999). "Diversity of mRNA expression for muscarinic acetylcholine receptor subtypes and neuronal nicotinic acetylcholine receptor subunits in human mononuclear leukocytes and leukemic cell lines". Neurosci. Lett. 266 (1): 17–20. PMID 10336173.CS1 maint: Explicit use of et al. (link) CS1 maint: Multiple names: authors list (link)
• Retondaro FC, Dos Santos Costa PC, Pedrosa RC, Kurtenbach E (1999). "Presence of antibodies against the third intracellular loop of the m2 muscarinic receptor in the sera of chronic chagasic patients". FASEB J. 13 (14): 2015–20. PMID 10544184.CS1 maint: Multiple names: authors list (link)
• Waid DK, Chell M, El-Fakahany EE (2000). "M(2) and M(4) muscarinic receptor subtypes couple to activation of endothelial nitric oxide synthase". Pharmacology. 61 (1): 37–42. PMID 10895079.CS1 maint: Multiple names: authors list (link)
• Obara K, Arai K, Miyajima N; et al. (2000). "Expression of m2 muscarinic acetylcholine receptor mRNA in primary culture of human prostate stromal cells". Urol. Res. 28 (3): 196–200. PMID 10929429.CS1 maint: Explicit use of et al. (link) CS1 maint: Multiple names: authors list (link)

External links

• CHRM2+protein,+human at the US National Library of Medicine Medical Subject Headings (MeSH)

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