View source for Cysteinyl leukotriene receptor 2

<!--{{PBB|geneid=57105}}-->
{{Infobox gene}}

'''Cysteinyl leukotriene receptor 2''', also termed '''CYSLTR2''', is a receptor for cysteinyl leukotrienes (LT) (see [[leukotrienes#Cysteinyl leukotrienes]]). CYSLTR2, by binding these cysteinyl LTs (CysLTs; viz, [[LTC4]], [[LTD4]], and to a much lesser extent, [[LTE4]]) contributes to mediating various allergic and hypersensitivity reactions in humans. However, the first discovered receptor for these CsLTs, [[cysteinyl leukotriene receptor 1]] (CysLTR1), appears to play the major role in mediating these reactions.<ref name="pmid10913337">{{cite journal | vauthors = Takasaki J, Kamohara M, Matsumoto M, Saito T, Sugimoto T, Ohishi T, Ishii H, Ota T, Nishikawa T, Kawai Y, Masuho Y, Isogai T, Suzuki Y, Sugano S, Furuichi K | title = The molecular characterization and tissue distribution of the human cysteinyl leukotriene CysLT(2) receptor | journal = Biochem Biophys Res Commun | volume = 274 | issue = 2 | pages = 316–22 |date=August 2000 | pmid = 10913337 | pmc =  | doi = 10.1006/bbrc.2000.3140 }}</ref><ref name="pmid1085123">{{cite journal | vauthors = Van Keer C, Kersters K, De Ley J | title = L-Sorbose metabolism in Agrobacterium tumefaciens | journal = Antonie Van Leeuwenhoek | volume = 42 | issue = 1–2 | pages = 13–24 |date=September 1976 | pmid = 1085123 | pmc =  | doi =10.1007/BF00399445  }}</ref><ref name="entrez">{{cite web | title = Entrez Gene: CYSLTR2 cysteinyl leukotriene receptor 2| url = https://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=57105| accessdate = }}</ref>

<!-- The PBB_Summary template is automatically maintained by Protein Box Bot.  See Template:PBB_Controls to Stop updates. -->

== Gene ==
The human {{Gene|CysLTR2}} gene maps to the long arm of chromosome 13 at position 13q14, a chromosomal region that has long been linked to asthma and other allergic diseases.<ref name="pmid17154652">{{cite journal | vauthors = Thompson MD, Takasaki J, Capra V, Rovati GE, Siminovitch KA, Burnham WM, Hudson TJ, Bossé Y, Cole DE | title = G-protein-coupled receptors and asthma endophenotypes: the cysteinyl leukotriene system in perspective | journal = Molecular Diagnosis & Therapy | volume = 10 | issue = 6 | pages = 353–66 | year = 2006 | pmid = 17154652 | doi = 10.1007/bf03256212| url = }}</ref>  The gene consists of four exons with all introns located in the genes' [[5' UTR]] region and the entire coding region located in the last exon. '''CysLTR2'' encodes a [[protein]] composed of 347 [[amino acid]]s and shows only modest similarity to the ''CysLTR1'' gene in that its protein shares only 31% amino acid identity with the CysLTR1 protein.<ref name="pmid15454733">{{cite journal | vauthors = Fukai H, Ogasawara Y, Migita O, Koga M, Ichikawa K, Shibasaki M, Arinami T, Noguchi E | title = Association between a polymorphism in cysteinyl leukotriene receptor 2 on chromosome 13q14 and atopic asthma | journal = Pharmacogenetics | volume = 14 | issue = 10 | pages = 683–90 | year = 2004 | pmid = 15454733 | doi = 10.1097/00008571-200410000-00006| url = }}</ref><ref name="pmid23859232">{{cite journal | vauthors = Singh RK, Tandon R, Dastidar SG, Ray A | title = A review on leukotrienes and their receptors with reference to asthma | journal = The Journal of Asthma | volume = 50 | issue = 9 | pages = 922–31 | date = November 2013 | pmid = 23859232 | doi = 10.3109/02770903.2013.823447 }}</ref><ref name="pmid25572555">{{cite journal | vauthors = Liu M, Yokomizo T | title = The role of leukotrienes in allergic diseases | journal = Allergology International | volume = 64 | issue = 1 | pages = 17–26 | year = 2015 | pmid = 25572555 | doi = 10.1016/j.alit.2014.09.001 | url = }}</ref>

== Receptor ==
CySLTR2 [[mRNA]] is co-expressed along with CysLRR1 in human blood [[eosinophil]]s and [[platelet]]s, and tissue [[mast cell]]s, [[macrophage]]s, airway [[epithelial cell]]s, and vascular [[endothelial cell]]s. It is also expressed without CysLTR1 throughout the heart, including [[Purkinje cell]]s, [[adrenal gland]], and brain as well as some vascular endothelial, airway epithelial, and smooth muscle cells.<ref name="pmid23859232"/><ref name="pmid25572555"/><ref name="pmid16771777">{{cite journal | vauthors = Zhang J, Migita O, Koga M, Shibasaki M, Arinami T, Noguchi E | title = Determination of structure and transcriptional regulation of CYSLTR1 and an association study with asthma and rhinitis | journal = Pediatric Allergy and Immunology | volume = 17 | issue = 4 | pages = 242–9 | date = June 2006 | pmid = 16771777 | doi = 10.1111/j.1399-3038.2005.00347.x }}</ref><ref name="pmid26149010">{{cite journal | vauthors = Cattaneo M | title = P2Y12 receptors: structure and function | journal = Journal of Thrombosis and Haemostasis : JTH | volume = 13 Suppl 1 | issue = | pages = S10–6 | year = 2015 | pmid = 26149010 | doi = 10.1111/jth.12952 | url = }}</ref>

CysLTR2, similar to CysLTR1, is a [[G protein–coupled receptor]] that links to and when bound to its CysLT [[ligand]]s activates the [[Gq alpha subunit]] and/or [[Ga subunit]] of its coupled G protein, depending or the cell type. Acting through these G proteins and their subunits, ligand-bound CysLTR1 activates a series of pathways that lead to cell function (see [[Gq alpha subunit#function]] and [[Ga subunit#function]] for details); the order of potency of the cysLTs in stimulating CysLTR2 is LTD4=LTC4>LTE4 with LTE4 probably lacking sufficient potency to have much activity that operates through CysLTR1 in vivo. By comparison, the stimulating potencies of these CysLTs for CysLTR1 is LTD4>LTC4>LTE4 with LTD4 showing 10-fold greater potency on CysLTR1 than CysLTR2.<ref name="pmid23859232"/><ref name="pmid25572555"/> Perhaps related to this difference in CysLT sensitivities, cells co-expressing CysLTR2 and CysLTR1 may exhibit lower sensitivity to LTD4 than do cells expressing only CysLTR1; in consequence, CysLTR2 has been suggested to dampen CysLTR1's activities.<ref name="pmid24991451">{{cite journal | vauthors = Kanaoka Y, Boyce JA | title = Cysteinyl leukotrienes and their receptors; emerging concepts | journal = Allergy, Asthma & Immunology Research | volume = 6 | issue = 4 | pages = 288–95 | year = 2014 | pmid = 24991451 | pmc = 4077954 | doi = 10.4168/aair.2014.6.4.288 | url = }}</ref>

In addition to CysLTR1, [[GPR99]] (also termed the oxoglutarate receptor or, sometimes, CysLTR3) appears to be an important receptor for CysLTs, particularly for LTE4: the CystLTs show relative potencies of LTE4>LTC4>LTD4 in stimulating GPR99-bearing cells and GPR99-deficient mice exhibit a dose-dependent loss of vascular permeability responses in skin to LTE4 but not to LTC4 or LTD4.<ref name="pmid23859232"/><ref name="pmid27185938">{{cite journal | vauthors = Bankova LG, Lai J, Yoshimoto E, Boyce JA, Austen KF, Kanaoka Y, Barrett NA | title = Leukotriene E4 elicits respiratory epithelial cell mucin release through the G-protein-coupled receptor, GPR99 | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 113 | issue = 22 | pages = 6242–7 | date = May 2016 | pmid = 27185938 | doi = 10.1073/pnas.1605957113 }}</ref><ref name="pmid23504326">{{cite journal | vauthors = Kanaoka Y, Maekawa A, Austen KF | title = Identification of GPR99 protein as a potential third cysteinyl leukotriene receptor with a preference for leukotriene E4 ligand | journal = The Journal of Biological Chemistry | volume = 288 | issue = 16 | pages = 10967–72 | date = April 2013 | pmid = 23504326 | pmc = 3630866 | doi = 10.1074/jbc.C113.453704 }}</ref>

Other studies on model cells for allergy have defined [[GPR17]] (also termed the uracil nucleotide/cysteinyl leukotriene receptor) as a receptor not only [[uracil nucleotides]] but also for CysLTs, with CysLTs having the following potencies LTD4>LTC4>LTE4 in stimulating GPR17-bearing cells. However, recent studies also working with model cells involved in allergy find that GPR17-bearing cells do not respond to these CysLTs (or uracil nucleotides). Rather, they find that: '''a)''' cells expressing both CysLTR1 and GPR17 receptors exhibit a marked reduction in binding and responding to LTD4 and '''b)''' mice lacking GPR17 are hyper-responsive to [[igE]] in a model for passive cutaneous anaphylaxis. The latter studies conclude that GPR17 acts to inhibit CysLTR1.<ref name="pmid24991451"/> Finally, and in striking contrast to these studies, repeated studies on neural tissues find that [[Oligodendrocyte progenitor cell]]s express GPR17 and respond through this receptor to LTC4, LTD4, and certain purines (see [[GPR17#Function]]).

== CysLTR2 inhibitors ==
There are as yet no selective inhibitors of CysLTR2 that are in clinical use (see Clinical significance section below). However, Gemilukast (ONO-6950) reportedly inhibits both CysLTR1 and CysLTR2. The drug is currently being evaluated in phase II trials for the treatment of asthma.<ref name="pmid26200813">{{cite journal | vauthors = Itadani S, Yashiro K, Aratani Y, Sekiguchi T, Kinoshita A, Moriguchi H, Ohta N, Takahashi S, Ishida A, Tajima Y, Hisaichi K, Ima M, Ueda J, Egashira H, Sekioka T, Kadode M, Yonetomi Y, Nakao T, Inoue A, Nomura H, Kitamine T, Fujita M, Nabe T, Yamaura Y, Matsumura N, Imagawa A, Nakayama Y, Takeuchi J, Ohmoto K | title = Discovery of Gemilukast (ONO-6950), a Dual CysLT1 and CysLT2 Antagonist As a Therapeutic Agent for Asthma | journal = Journal of Medicinal Chemistry | volume = 58 | issue = 15 | pages = 6093–113 | year = 2015 | pmid = 26200813 | doi = 10.1021/acs.jmedchem.5b00741 | url = }}</ref>

== CysLTR2 polymorphism ==
Polymorphism in the ''CysLTR2'' gene resulting in a single amino acid substitution, M201V (i.e. amino acid methionine changed for valine at the 201 position of CysLTR2 protein) has been negatively associated in [[Transmission disequilibrium test]]ing with the inheritance of asthma in separate populations of: '''a)''' white and African-Americans from 359 families with a high prevalence of asthma in Denmark and Minnesota, USA, and '''b)''' 384 families with a high prevalence of asthma from the Genetics of Asthma International Network. The M201V CysLTR2 variant exhibits decreased responsiveness to LTD4 suggesting that this hypo-responsiveness underlies its asthma transmission-protecting effect.<ref name="pmid20966037">{{cite journal | vauthors = Brochu-Bourque A, Véronneau S, Rola-Pleszczynski M, Stankova J | title = Differential signaling defects associated with the M201V polymorphism in the cysteinyl leukotriene type 2 receptor | journal = The Journal of Pharmacology and Experimental Therapeutics | volume = 336 | issue = 2 | pages = 431–9 | year = 2011 | pmid = 20966037 | doi = 10.1124/jpet.110.172411 | url = }}</ref><ref>https://www.wikigenes.org/e/gene/e/57105.html</ref> A -1220A>C (i.e. nucleotide adenine substituted for cytosine at position 1220 upstream from the transcription start site) [[gene polymorphism]] variant in [[intron]] III the upstream region of CysLTR2 has been associated significantly with development of asthma in a Japanese population; the impact of this polymorphism on the genes expression or product has not been determined.<ref name="pmid15454733"/> These results suggest that CYSLTR2 contributes to the etiology and development asthma and that drugs targeting CYSLTR2 may work in a manner that differs from those of CYSLTR1 antagonists.<ref name="pmid15454733"/>

== Clinical significance ==
The CysLT-induced activation of CysLTR2 induces many of the same in vitro responses of cells involved in allergic reactions as well as the in vivo allergic responses in animal models as that induced by CysLT-induced CysLTR1 (see [[Cysteinyl leukotriene receptor 1#Receptor]].<ref name="pmid25572555"/> However, CysLT2 requires 10-fold higher concentrations of LTD4, the most potent cysLT for CysLTR1, to activate CysLTR2. Furthermore, the allergic and hypersensitivity responses of humans and animal models are significantly reduced by chronic treatment with [[Montelukast]], [[Zafirlukast]], and [[Pranlukast]], drugs which are selective [[receptor antagonists]] of CysLTR1 but not CysLTR2.<ref name="pmid21936577">{{cite journal | vauthors = Haeggström JZ, Funk CD | title = Lipoxygenase and leukotriene pathways: biochemistry, biology, and roles in disease | journal = Chemical Reviews | volume = 111 | issue = 10 | pages = 5866–98 | date = October 2011 | pmid = 21936577 | doi = 10.1021/cr200246d }}</ref><ref name="pmid24313690">{{cite journal | vauthors = Anwar Y, Sabir JS, Qureshi MI, Saini KS | title = 5-lipoxygenase: a promising drug target against inflammatory diseases-biochemical and pharmacological regulation | journal = Current Drug Targets | volume = 15 | issue = 4 | pages = 410–22 | date = April 2014 | pmid = 24313690 | doi =  10.2174/1389450114666131209110745}}</ref><ref name="pmid26980339">{{cite journal | vauthors = Kar M, Altıntoprak N, Muluk NB, Ulusoy S, Bafaqeeh SA, Cingi C | title = Antileukotrienes in adenotonsillar hypertrophy: a review of the literature | journal = European Archives of Oto-Rhino-Laryngology | volume =  273| issue =  | date = March 2016 | pmid = 26980339 | doi = 10.1007/s00405-016-3983-8 | pages=4111–4117}}</ref><ref name="pmid26678823">{{cite journal | vauthors = Oussalah A, Mayorga C, Blanca M, Barbaud A, Nakonechna A, Cernadas J, Gotua M, Brockow K, Caubet JC, Bircher A, Atanaskovic M, Demoly P, K Tanno L, Terreehorst I, Laguna JJ, Romano A, Guéant JL | title = Genetic variants associated with drugs-induced immediate hypersensitivity reactions: a PRISMA-compliant systematic review | journal = Allergy | volume = 71 | issue = 4 | pages = 443–62 | date = April 2016 | pmid = 26678823 | doi = 10.1111/all.12821 }}</ref> Models of allergic reactions in Cysltr2-deficient mice as well as in a human [[mast cell]] line indicate that mouse Cysltr2 and its human [[homolog]] CysLTR2 act to inhibit Cysltr1 and CysLTR1, respectively, and therefore suggest that CysLTR2 may similarly inhibit CysLTR1 in human allergic diseases.<ref name="pmid19647860">{{cite journal | vauthors = Austen KF, Maekawa A, Kanaoka Y, Boyce JA | title = The leukotriene E4 puzzle: finding the missing pieces and revealing the pathobiologic implications | journal = The Journal of Allergy and Clinical Immunology | volume = 124 | issue = 3 | pages = 406–14; quiz 415–6 | year = 2009 | pmid = 19647860 | pmc = 2739263 | doi = 10.1016/j.jaci.2009.05.046 | url = }}</ref><ref name="pmid17693579">{{cite journal | vauthors = Jiang Y, Borrelli LA, Kanaoka Y, Bacskai BJ, Boyce JA | title = CysLT2 receptors interact with CysLT1 receptors and down-modulate cysteinyl leukotriene dependent mitogenic responses of mast cells | journal = Blood | volume = 110 | issue = 9 | pages = 3263–70 | year = 2007 | pmid = 17693579 | pmc = 2200919 | doi = 10.1182/blood-2007-07-100453 | url = }}</ref>  The role of CysLTR2 in the allergic and hypersensitivity diseases of humans must await the development of selective CysLTR2 inhibitors.

==See also==
* [[Cysteinyl leukotriene receptor 1]]
* [[Eicosanoid receptor]]
* [[GPR99]]

==References==
{{reflist}}

==Further reading==
{{refbegin | 2}}
{{PBB_Further_reading 
| citations = 
*{{cite journal  | vauthors=Nothacker HP, Wang Z, Zhu Y |title=Molecular cloning and characterization of a second human cysteinyl leukotriene receptor: discovery of a subtype selective agonist |journal=Mol. Pharmacol. |volume=58 |issue= 6 |pages= 1601–8 |year= 2001 |pmid= 11093801 |doi=  |display-authors=etal}}
*{{cite journal  | vauthors=Mita H, Hasegawa M, Saito H, Akiyama K |title=Levels of cysteinyl leukotriene receptor mRNA in human peripheral leucocytes: significantly higher expression of cysteinyl leukotriene receptor 2 mRNA in eosinophils |journal=Clin. Exp. Allergy |volume=31 |issue= 11 |pages= 1714–23 |year= 2002 |pmid= 11696047 |doi=10.1046/j.1365-2222.2001.01184.x  }}
*{{cite journal  | vauthors=Takeda S, Kadowaki S, Haga T |title=Identification of G protein-coupled receptor genes from the human genome sequence |journal=FEBS Lett. |volume=520 |issue= 1–3 |pages= 97–101 |year= 2002 |pmid= 12044878 |doi=10.1016/S0014-5793(02)02775-8  |display-authors=etal}}
*{{cite journal  | vauthors=Shirasaki H, Kanaizumi E, Watanabe K |title=Expression and localization of the cysteinyl leukotriene 1 receptor in human nasal mucosa |journal=Clin. Exp. Allergy |volume=32 |issue= 7 |pages= 1007–12 |year= 2003 |pmid= 12100046 |doi=10.1046/j.1365-2222.2002.01425.x  |display-authors=etal}}
*{{cite journal  | vauthors=Strausberg RL, Feingold EA, Grouse LH |title=Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=99 |issue= 26 |pages= 16899–903 |year= 2003 |pmid= 12477932 |doi= 10.1073/pnas.242603899  | pmc=139241 |display-authors=etal}}
*{{cite journal  | vauthors=Sjöström M, Johansson AS, Schröder O |title=Dominant expression of the CysLT2 receptor accounts for calcium signaling by cysteinyl leukotrienes in human umbilical vein endothelial cells |journal=Arterioscler. Thromb. Vasc. Biol. |volume=23 |issue= 8 |pages= e37–41 |year= 2004 |pmid= 12816881 |doi= 10.1161/01.ATV.0000082689.46538.DF |display-authors=etal}}
*{{cite journal  | vauthors=Mellor EA, Frank N, Soler D |title=Expression of the type 2 receptor for cysteinyl leukotrienes (CysLT2R) by human mast cells: Functional distinction from CysLT1R |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=100 |issue= 20 |pages= 11589–93 |year= 2003 |pmid= 13679572 |doi= 10.1073/pnas.2034927100  | pmc=208802 |display-authors=etal}}
*{{cite journal  | vauthors=Thompson MD, Storm van's Gravesande K, Galczenski H |title=A cysteinyl leukotriene 2 receptor variant is associated with atopy in the population of Tristan da Cunha |journal=Pharmacogenetics |volume=13 |issue= 10 |pages= 641–9 |year= 2004 |pmid= 14515063 |doi= 10.1097/01.fpc.0000054127.14659.42 |display-authors=etal}}
*{{cite journal  | vauthors=Dunham A, Matthews LH, Burton J |title=The DNA sequence and analysis of human chromosome 13 |journal=Nature |volume=428 |issue= 6982 |pages= 522–8 |year= 2004 |pmid= 15057823 |doi= 10.1038/nature02379  | pmc=2665288 |display-authors=etal}}
*{{cite journal  | vauthors=Fukai H, Ogasawara Y, Migita O |title=Association between a polymorphism in cysteinyl leukotriene receptor 2 on chromosome 13q14 and atopic asthma |journal=Pharmacogenetics |volume=14 |issue= 10 |pages= 683–90 |year= 2005 |pmid= 15454733 |doi=10.1097/00008571-200410000-00006  |display-authors=etal}}
*{{cite journal  | vauthors=Pillai SG, Cousens DJ, Barnes AA |title=A coding polymorphism in the CYSLT2 receptor with reduced affinity to LTD4 is associated with asthma |journal=Pharmacogenetics |volume=14 |issue= 9 |pages= 627–33 |year= 2005 |pmid= 15475736 |doi=10.1097/00008571-200409000-00007  |display-authors=etal}}
*{{cite journal  | vauthors=Gerhard DS, Wagner L, Feingold EA |title=The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC) |journal=Genome Res. |volume=14 |issue= 10B |pages= 2121–7 |year= 2004 |pmid= 15489334 |doi= 10.1101/gr.2596504  | pmc=528928 |display-authors=etal}}
*{{cite journal  | vauthors=Hui Y, Cheng Y, Smalera I |title=Directed vascular expression of human cysteinyl leukotriene 2 receptor modulates endothelial permeability and systemic blood pressure |journal=Circulation |volume=110 |issue= 21 |pages= 3360–6 |year= 2005 |pmid= 15545522 |doi= 10.1161/01.CIR.0000147775.50954.AA |display-authors=etal}}
*{{cite journal  | vauthors=Corrigan C, Mallett K, Ying S |title=Expression of the cysteinyl leukotriene receptors cysLT(1) and cysLT(2) in aspirin-sensitive and aspirin-tolerant chronic rhinosinusitis |journal=J. Allergy Clin. Immunol. |volume=115 |issue= 2 |pages= 316–22 |year= 2005 |pmid= 15696087 |doi= 10.1016/j.jaci.2004.10.051 |display-authors=etal}}
*{{cite journal  | vauthors=Uzonyi B, Lötzer K, Jahn S |title=Cysteinyl leukotriene 2 receptor and protease-activated receptor 1 activate strongly correlated early genes in human endothelial cells |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=103 |issue= 16 |pages= 6326–31 |year= 2006 |pmid= 16606835 |doi= 10.1073/pnas.0601223103  | pmc=1458877 |display-authors=etal}}
*{{cite journal  | vauthors=Woszczek G, Chen LY, Nagineni S |title=IFN-gamma induces cysteinyl leukotriene receptor 2 expression and enhances the responsiveness of human endothelial cells to cysteinyl leukotrienes |journal=J. Immunol. |volume=178 |issue= 8 |pages= 5262–70 |year= 2007 |pmid= 17404310 |doi=  10.4049/jimmunol.178.8.5262|display-authors=etal}}
*{{cite journal  | vauthors=Klotsman M, York TP, Pillai SG |title=Pharmacogenetics of the 5-lipoxygenase biosynthetic pathway and variable clinical response to montelukast |journal=Pharmacogenet. Genomics |volume=17 |issue= 3 |pages= 189–96 |year= 2007 |pmid= 17460547 |doi= 10.1097/FPC.0b013e3280120043 |display-authors=etal}}
}}
{{refend}}

==External links==
*{{cite web | url = http://www.iuphar-db.org/GPCR/ReceptorDisplayForward?receptorID=2345 | title = Leukotriene Receptors: CysLT<sub>2</sub> | accessdate = | date = | format = | work = IUPHAR Database of Receptors and Ion Channels | publisher = International Union of Basic and Clinical Pharmacology | pages = | language = | archiveurl = | archivedate = | quote = }}
{{G protein-coupled receptors}}
{{Prostanoidergics}}
{{NLM content}}
<!-- The PBB_Controls template provides controls for Protein Box Bot, please see Template:PBB_Controls for details. -->
{{PBB_Controls
| update_page = yes 
| require_manual_inspection = no 
| update_protein_box = yes
| update_summary = yes
| update_citations = yes
}}
{{Use dmy dates|date=April 2017}}

[[Category:G protein coupled receptors]]