Cannabinoid receptor

src: molpharm.aspetjournals.org

Cannabinoid receptors, located throughout the body, are part of the endocannabinoid system, which is involved in a variety of physiological processes including appetite, pain-sensation, mood, and memory.

Cannabinoid receptors are of a class of cell membrane receptors in the G protein-coupled receptor superfamily. As is typical of G protein-coupled receptors, the cannabinoid receptors contain seven transmembrane spanning domains. Cannabinoid receptors are activated by three major groups of ligands: endocannabinoids, produced by the mammillary body; plant cannabinoids (such as cannabidiol, produced by the cannabis plant); and synthetic cannabinoids (such as HU-210). All of the endocannabinoids and plant cannabinoids are lipophilic, such as fat soluble compounds.

There are currently two known subtypes of cannabinoid receptors, termed CB₁ and CB₂. 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 and in hematopoietic cells. Mounting evidence suggests that there are novel cannabinoid receptors that is, non-CB₁ and non-CB₂, which are expressed in endothelial cells and in the CNS. In 2007, the binding of several cannabinoids to the G protein-coupled receptor GPR55 in the brain was described.

The protein sequences of CB₁ and CB₂ receptors are about 44% similar. When only the transmembrane regions of the receptors are considered, amino acid similarity between the two receptor subtypes is approximately 68%. 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.

It appears that cannabinoid receptors are unique to the phylum Chordata and, as such, they have a rather restricted phylogenetic distribution in the animal kingdom. However, enzymes involved in biosynthesis/inactivation of endocannabinoids and endocannabinoid signalling in general (involving targets other than CB1/2-type receptors) occur throughout the animal kingdom.

Video Cannabinoid receptor

CB₁

Cannabinoid receptor type 1 (CB₁) receptors are thought to be one of the most widely expressed G_?i protein-coupled receptors in the brain. This is due to 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.

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.

A 2004 study suggested that the endocannabinoids and their cannabinoid receptors play a major role during pre- and postnatal development. In another recent study a group of researchers combined stochastic optical reconstruction microscopy (STORM) and patch clamp in order to see CB1 distribution on a nano scale with incredible resolution.

Maps Cannabinoid receptor

CB₂

CB₂ receptors are mainly expressed on T cells of the immune system, on macrophages and B cells, and in hematopoietic cells. 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.

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Other cannabinoid receptors

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. 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. 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. 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. 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, 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.

src: www.pnas.org

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.

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). 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.

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.

src: molpharm.aspetjournals.org

Physiology

Cardiovascular activity

Studies have suggested that activation of CB₁ receptors in human and rodent cardiomyocytes, coronary artery endothelial and inflammatory cells promotes activation of mitogen-activated protein (MAP) kinases p38 and JNK, reactive oxygen species generation, cell death, and cardiovascular inflammatory response both in vitro, as well as in models of heart failure, atherosclerosis and vascular inflammation.

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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. 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.

src: www.pnas.org

Ligands

See also: cannabinoid receptor type 1 ligands, cannabinoid receptor type 2 ligands

Binding affinity and selectivity of cannabinoid ligands

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See also

• Cannabinoid receptor antagonist
• Endocannabinoid enhancer
• Endocannabinoid reuptake inhibitor
• Cannabidiol
• Effects of cannabis

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References

src: cb1cap.com

External links

• Cannabinoid+Receptors at the US National Library of Medicine Medical Subject Headings (MeSH)
• The Endocannabinoid System Network (ECSN) - CB₁ receptor
• "Cannabinoid Receptors". IUPHAR Database of Receptors and Ion Channels. International Union of Basic and Clinical Pharmacology. 

Source of article : Wikipedia