Cannabinoid receptor

cannabinoid receptor 1
Human cannabinoid receptor 1 (CB1) bound to tetrahydrocannabinol agonist AM11542 (black). PDB: 5XRA
Identifiers
SymbolCNR1
Alt. symbolsCNR
NCBI gene1268
HGNC2159
OMIM114610
Orthologs7273
RefSeqNM_033181
UniProtP21554
Other data
LocusChr. 6 q14-q15
Search for
StructuresSwiss-model
DomainsInterPro
cannabinoid receptor 2
Human cannabinoid receptor 2 (CB2) bound to agonist AM10257 (black). PDB: 5ZTY
Identifiers
SymbolCNR2
NCBI gene1269
HGNC2160
OMIM605051
Orthologs1389
RefSeqNM_001841
UniProtP34972
Other data
LocusChr. 1 p
Search for
StructuresSwiss-model
DomainsInterPro
CB1 and CB2 structures

Cannabinoid receptors, located throughout the body, are part of the endocannabinoid system of vertebrates– a class of cell membrane receptors in the G protein-coupled receptor superfamily.[1][2][3][4] As is typical of G protein-coupled receptors, the cannabinoid receptors contain seven transmembrane spanning domains.[5] Cannabinoid receptors are activated by three major groups of ligands:

All endocannabinoids and phytocannabinoids are lipophilic.

There are two known subtypes of cannabinoid receptors, termed CB1 and CB2.[6][7] The CB1 receptor is expressed mainly in the brain (central nervous system or "CNS"), but also in the lungs, liver and kidneys. The CB2 receptor is expressed mainly in the immune system, in hematopoietic cells,[8] and in parts of the brain.[9]

The protein sequences of CB1 and CB2 receptors are about 44% similar.[10][11] When only the transmembrane regions of the receptors are considered, amino acid similarity between the two receptor subtypes is approximately 68%.[5] In addition, minor variations in each receptor have been identified. Cannabinoids bind reversibly and stereo-selectively to the cannabinoid receptors. Subtype selective cannabinoids have been developed which theoretically may have advantages for treatment of certain diseases such as obesity.[12]

Enzymes involved in biosynthesis/inactivation of endocannabinoids and endocannabinoid signaling in general (involving targets other than CB1/2-type receptors) occur throughout the animal kingdom.[13]

Discovery

The existence of cannabinoid receptors in the brain was discovered from in vitro studies in the 1980s, with the receptor designated as the cannabinoid receptor type 1 or CB1.[14][15] The DNA sequence that encodes a G-protein-coupled cannabinoid receptor in the human brain was identified and cloned in 1990.[16][17] These discoveries led to determination in 1993 of a second brain cannabinoid receptor named cannabinoid receptor type 2 or CB2.[15]

A neurotransmitter for a possible endocannabinoid system in the brain and peripheral nervous system, anandamide (from 'ananda', Sanskrit for 'bliss'), was first characterized in 1992,[18][19][20] followed by discovery of other fatty acid neurotransmitters that behave as endogenous cannabinoids having a low-to-high range of efficacy for stimulating CB1 receptors in the brain and CB2 receptors in the periphery.[15][18]

Types

CB1

Cannabinoid receptor type 1 (CB1) receptors are thought to be one of the most widely expressed Gαi protein-coupled receptors in the brain. One mechanism through which they function is endocannabinoid-mediated depolarization-induced suppression of inhibition, a very common form of retrograde signaling, in which the depolarization of a single neuron induces a reduction in GABA-mediated neurotransmission. Endocannabinoids released from the depolarized post-synaptic neuron bind to CB1 receptors in the pre-synaptic neuron and cause a reduction in GABA release due to limited presynaptic calcium ions entry.[medical citation needed]

They are also found in other parts of the body. For instance, in the liver, activation of the CB1 receptor is known to increase de novo lipogenesis.[21]

CB2

CB2 receptors are expressed on T cells of the immune system, on macrophages and B cells, in hematopoietic cells, and in the brain and CNS (2019).[22] They also have a function in keratinocytes. They are also expressed on peripheral nerve terminals. These receptors play a role in antinociception, or the relief of pain. In the brain, they are mainly expressed by microglial cells, where their role remains unclear. While the most likely cellular targets and executors of the CB2 receptor-mediated effects of endocannabinoids or synthetic agonists are the immune and immune-derived cells (e.g. leukocytes, various populations of T and B lymphocytes, monocytes/macrophages, dendritic cells, mast cells, microglia in the brain, Kupffer cells in the liver, astrocytes, etc.), the number of other potential cellular targets is expanding, now including endothelial and smooth muscle cells, fibroblasts of various origins, cardiomyocytes, and certain neuronal elements of the peripheral or central nervous systems (2011).[8]

Other

The existence of additional cannabinoid receptors has long been suspected, due to the actions of compounds such as abnormal cannabidiol that produce cannabinoid-like effects on blood pressure and inflammation, yet do not activate either CB1 or CB2.[23][24] Recent research strongly supports the hypothesis that the N-arachidonoyl glycine (NAGly) receptor GPR18 is the molecular identity of the abnormal cannabidiol receptor and additionally suggests that NAGly, the endogenous lipid metabolite of anandamide (also known as arachidonoylethanolamide or AEA), initiates directed microglial migration in the CNS through activation of GPR18.[25] Other molecular biology studies have suggested that the orphan receptor GPR55 should in fact be characterised as a cannabinoid receptor, on the basis of sequence homology at the binding site. Subsequent studies showed that GPR55 does indeed respond to cannabinoid ligands.[26][27] This profile as a distinct non-CB1/CB2 receptor that responds to a variety of both endogenous and exogenous cannabinoid ligands, has led some groups to suggest GPR55 should be categorized as the CB3 receptor, and this re-classification may follow in time.[28] However this is complicated by the fact that another possible cannabinoid receptor has been discovered in the hippocampus, although its gene has not yet been cloned,[29] suggesting that there may be at least two more cannabinoid receptors to be discovered, in addition to the two that are already known. GPR119 has been suggested as a fifth possible cannabinoid receptor,[30] while the PPAR family of nuclear hormone receptors can also respond to certain types of cannabinoid.[31]

Signaling

Cannabinoid receptors are activated by cannabinoids, generated naturally inside the body (endocannabinoids) or introduced into the body as cannabis or a related synthetic compound.[10] Similar responses are produced when introduced in alternative methods, only in a more concentrated form than what is naturally occurring.

After the receptor is engaged, multiple intracellular signal transduction pathways are activated. At first, it was thought that cannabinoid receptors mainly inhibited the enzyme adenylate cyclase (and thereby the production of the second messenger molecule cyclic AMP), and positively influenced inwardly rectifying potassium channels (=Kir or IRK).[32] However, a much more complex picture has appeared in different cell types, implicating other potassium ion channels, calcium channels, protein kinase A and C, Raf-1, ERK, JNK, p38, c-fos, c-jun and many more.[32] For example, in human primary leukocytes CB2 displays a complex signalling profile, activating adenylate cyclase via stimulatory Gαs alongside the classical Gαi signalling, and induces ERK, p38 and pCREB pathways.[33]

Separation between the therapeutically undesirable psychotropic effects, and the clinically desirable ones, however, has not been reported with agonists that bind to cannabinoid receptors. THC, as well as the two major endogenous compounds identified so far that bind to the cannabinoid receptors —anandamide and 2-arachidonylglycerol (2-AG)— produce most of their effects by binding to both the CB1 and CB2 cannabinoid receptors. While the effects mediated by CB1, mostly in the central nervous system, have been thoroughly investigated, those mediated by CB2 are not equally well defined.

Prenatal cannabis exposure (PCE) has been shown to perturb the fetal endogenous cannabinoid signaling system. This perturbation has not been shown to directly affect neurodevelopment nor cause lifelong cognitive, behavioral, or functional abnormalities, but it may predispose offspring to abnormalities in cognition and altered emotionality from post-natal factors.[34] Additionally, PCE may alter the wiring of brain circuitry in foetal development and cause significant molecular modifications to neurodevelopmental programs that may lead to neurophysiological disorders and behavioural abnormalities.[35]

Cannabinoid treatments

Synthetic tetrahydrocannabinol (THC) is prescribed under the INN dronabinol or the brand name Marinol, to treat vomiting and for enhancement of appetite, mainly in people with AIDS as well as for refractory nausea and vomiting in people undergoing chemotherapy.[36] Use of synthetic THC is becoming more common as the known benefits become more prominent within the medical industry. THC is also an active ingredient in nabiximols, a specific extract of Cannabis that was approved as a botanical drug in the United Kingdom in 2010 as a mouth spray for people with multiple sclerosis to alleviate neuropathic pain, spasticity, overactive bladder, and other symptoms.[37]

Ligands

Binding affinity and selectivity of cannabinoid ligands:

CB1 affinity (Ki) Efficacy towards CB1 CB2 affinity (Ki) Efficacy towards CB2 Type References
Anandamide 78nM Partial agonist 370nM ? Endogenous
N-Arachidonoyl dopamine ? Agonist ? ? Endogenous
2-Arachidonoylglycerol ? Full agonist ? ? Endogenous
2-Arachidonyl glyceryl ether 21 nM Full agonist 480nM Full agonist Endogenous
Δ-9-Tetrahydrocannabinol 10nM Partial agonist 24nM Partial agonist Phytogenic [38]
EGCG 33,600 nM Agonist >50,000 nM ? Phytogenic [39]
Yangonin 720 nM ? >10,000 nM ? Phytogenic [40]
AM-1221 52.3nM Agonist 0.28nM Agonist Synthetic [41]
AM-1235 1.5nM Agonist 20.4nM Agonist Synthetic [42]
AM-2232 0.28nM Agonist 1.48nM Agonist Synthetic [42]
UR-144 150nM Full agonist 1.8nM Full agonist Synthetic [43]
JWH-007 9.0nM Agonist 2.94nM Agonist Synthetic [44]
JWH-015 383nM Agonist 13.8nM Agonist Synthetic [44]
JWH-018 9.00 ± 5.00 nM Full agonist 2.94 ± 2.65 nM Full agonist Synthetic [44]

See also

References

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Soviet nuclear engineer in charge during the Chernobyl disaster In this name that follows Eastern Slavic naming customs, the patronymic is Stepanovich and the family name is Dyatlov. Anatoly DyatlovАнатолий ДятловDyatlov in 1987BornAnatoly Stepanovich Dyatlov(1931-03-03)3 March 1931Sukhobuzimsky District, Krasnoyarsk Krai, Russian SFSR, Soviet UnionDied13 December 1995(1995-12-13) (aged 64)Kyiv, UkraineOther namesАнатолій Степанович Дятлов (...

 

 

Ruma Pal Hakim Mahkamah Agung IndiaMasa jabatan28 Januari 2000 – 02 Juni 2006 Informasi pribadiKebangsaanIndiaProfesiHakimSunting kotak info • L • B Ruma Pal adalah hakim Mahkamah Agung India. Ia mulai menjabat sebagai hakim di mahkamah tersebut pada 28 Januari 2000. Masa baktinya sebagai hakim berakhir pada 02 Juni 2006. Ia merupakan hakim wanita dengan masa jabatan terpanjang di Mahkamah Agung India. Ia juga pernah menjabat sebagai hakim di Pengadilan Tinggi Kolkata...

 

 

SenateDominion of CeylonTypeTypeUpper house HistoryEstablished1947Disbanded2 October 1971Preceded byState Council of CeylonSucceeded byNoneSeats30Meeting placeThe old Legislative Council building in Colombo Fort that used to house the Senate. Today it is known as the Republic Building and houses the Ministry of Foreign Affairs. Politics of Sri Lanka Constitution Previous constitutions: 1931 · 1947 Law of Sri Lanka Human rights Law enforcement GovernmentExecutive President (List) Pr...

American distributor of press releases (company) This article relies excessively on references to primary sources. Please improve this article by adding secondary or tertiary sources. Find sources: PR Newswire – news · newspapers · books · scholar · JSTOR (October 2017) (Learn how and when to remove this message) PR NewswireIndustryCommunicationsFoundedMarch 8, 1954FounderHerbert MuschelFateAbsorbed by Cision, Inc.Headquarters300 S Riverside Plaza, Chi...

 

 

Yak

Yak Bos mutus Status konservasiRentanIUCN2892 TaksonomiKerajaanAnimaliaFilumChordataKelasMammaliaOrdoArtiodactylaFamiliBovidaeGenusBosSpesiesBos mutus Przew., 1883 SubspeciesB. g. grunniens B. g. mutusDistribusi EndemikRepublik Rakyat Tiongkok lbs Yak ( Bos grunniens ), juga dikenal sebagai sapi Tartary, sapi pendengus, [1] atau lembu berambut,[2] adalah spesies sapi peliharaan berbulu panjang yang ditemukan di seluruh wilayah Himalaya di Gilgit-Baltistan (Kashmir,Pakistan) ,N...

 

 

Australian politician Sir Daniel CooperBt GCMG1st Speaker of the New South Wales Legislative AssemblyIn office22 May 1856 – 31 January 1860MonarchVictoriaPremierSir Stuart DonaldsonSir Charles CowperSir Henry ParkerWilliam ForsterGovernorSir William DenisonSucceeded bySir Terence Aubrey MurrayConstituencySydney Hamlets Paddington Personal detailsBorn1 July 1821Bolton-le-Moors, Lancashire, EnglandDied5 June 1902(1902-06-05) (aged 80)Kensington, London, EnglandPolitical partyInd...

Bulgarien i olympiska spelen IOK-landskodBUL KommittéBulgariens Olympiska KommittéOlympiska vinterspelen 1992 i AlbertvilleDeltagare30 deltagare i 7 grenarFanbärareIva Karagiozova Medaljsummering Guld0 Silver0 Brons0 Totalt0 Bulgarien i olympiska sommarspelen1896 • 1900 • 1904 • 1908 • 1912 • 1920 • 1924 • 1928 • 1932 • 1936 • 1948 • 1952 • 1956 • 1960 • 1964 • 1968&...

 

 

FA Cup 1911-1912 Competizione FA Cup Sport Calcio Edizione 41ª Organizzatore FA Date dal 9 settembre 1911al 20 aprile 1912 Luogo  Inghilterra Partecipanti 64 Risultati Vincitore  Barnsley(1º titolo) Secondo  West Bromwich Semi-finalisti  Blackburn Swindon Town Statistiche Incontri disputati 87 Gol segnati 210 (2,41 per incontro) Cronologia della competizione 1910-1911 1912-1913 Manuale La FA Cup 1911-1912 fu la quarantunesima edizione del torneo calcis...

 

 

Questa voce o sezione sull'argomento centri abitati del Trentino-Alto Adige non cita le fonti necessarie o quelle presenti sono insufficienti. Puoi migliorare questa voce aggiungendo citazioni da fonti attendibili secondo le linee guida sull'uso delle fonti. Spormaggiorecomune Spormaggiore – VedutaLe due chiese di Spormaggiore LocalizzazioneStato Italia Regione Trentino-Alto Adige Provincia Trento AmministrazioneSindacoMirco Pomarolli (lista civica) dal 16-5-2...

Antwerpian Fin de la guerre of 1585 Fin de la guerre (French for End of War; also called by its Spanish or Latin name, Fin de la Guerra or Finis Belli) was an Antwerpian rebel ship employed during the siege of Antwerp (1585) against the imperial Spanish forces. The vessel resembled a huge floating fighting platform, featuring a castle in its center manned by a large number of guns and a thousand musketeers.[1] According to some sources, the ship was protected by thick iron plates.[...

 

 

Disambiguazione – Se stai cercando altri significati, vedi George Jones (disambigua). George Jones Nazionalità Stati Uniti GenereCountry Periodo di attività musicale1954 – 2013 Strumentovoce, chitarra acustica EtichettaMercury, RCA, Epic e altre Album pubblicati215 Studio80 Live3 Raccolte132 Sito ufficiale Modifica dati su Wikidata · Manuale George Glenn Jones (Saratoga, 12 settembre 1931 – Nashville, 26 aprile 2013) è stato un cantautore e musicista st...