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3D model (JSmol)
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|Molar mass||347.53 g/mol|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Anandamide, also known as N-arachidonoylethanolamine or AEA, is an endogenous cannabinoid neurotransmitter. It was isolated and its structure was first described by Czech analytical chemist Lumír Ondřej Hanuš and American molecular pharmacologist William Anthony Devane in the Laboratory of Raphael Mechoulam, at the Hebrew University in Jerusalem, Israel in 1992. The name is taken from the Sanskrit word ananda, which means "bliss, delight", and amide. It is synthesized from N-arachidonoyl phosphatidylethanolamine by multiple pathways. It is degraded primarily by the fatty acid amide hydrolase (FAAH) enzyme, which converts anandamide into ethanolamine and arachidonic acid. As such, inhibitors of FAAH lead to elevated anandamide levels and are being pursued for therapeutic use.
Anandamide's effects can be either central, in the brain, or peripheral, in other parts of the body. These distinct effects are mediated primarily by CB1 cannabinoid receptors in the central nervous system, and CB2 cannabinoid receptors in the periphery. The latter are mainly involved in functions of the immune system. Cannabinoid receptors were originally discovered as being sensitive to Δ9-tetrahydrocannabinol (Δ9-THC, commonly called THC), which is the primary psychoactive cannabinoid found in cannabis. The discovery of anandamide came from research into CB1 and CB2, as it was inevitable that a naturally occurring (endogenous) chemical would be found to affect these receptors.
Moreover, anandamide is thought to be an endogenous ligand for vanilloid receptors (which are involved in the transduction of acute and inflammatory pain signals), activating the receptor in a PKC-dependent (protein kinase C-dependent) manner.
Anandamide has been shown to be involved in working memory. Studies are under way to explore what role anandamide plays in human behavior, such as eating and sleep patterns, and pain relief.
Anandamide is also important for implantation of the early stage embryo in its blastocyst form into the uterus. Therefore cannabinoids such as Δ9-THC might interfere with the earliest stages of human pregnancy. Peak plasma anandamide occurs at ovulation and positively correlates with peak estradiol and gonadotrophin levels, suggesting that these may be involved in the regulation of AEA levels.
Anandamide also is important in the regulation of feeding behavior, and the neural generation of motivation and pleasure. In addition, anandamide injected directly into the forebrain reward-related brain structure nucleus accumbens enhances the pleasurable responses of rats to a rewarding sucrose taste, and enhances food intake as well.
A study published in 1998 shows that anandamide inhibits human breast cancer cell proliferation.
Synthesis and degradation
The human body synthesizes anandamide from N-arachidonoyl phosphatidylethanolamine (NAPE), which is itself made by transferring arachidonic acid from lecithin to the free amine of cephalin through an N-acyltransferase enzyme. Anandamide synthesis from NarPE occurs via multiple pathways and includes enzymes such as phospholipase A2, phospholipase C and NAPE-PLD. 
Endogenous anandamide is present at very low levels and has a very short half-life due to the action of the enzyme fatty acid amide hydrolase (FAAH), which breaks it down into free arachidonic acid and ethanolamine. Studies of piglets show that dietary levels of arachidonic acid and other essential fatty acids affect the levels of anandamide and other endocannabinoids in the brain. High fat diet feeding in mice increases levels of anandamide in the liver and increases lipogenesis. This suggests that anandamide may play a role in the development of obesity, at least in rodents.
Paracetamol (or acetaminophen in the U.S.A.) is metabolically combined with arachidonic acid by FAAH to form AM404. This metabolite of paracetamol is a potent agonist at the TRPV1 vanilloid receptor, a weak agonist at both CB1 and CB2 receptors, and an inhibitor of anandamide reuptake. As a result, anandamide levels in the body and brain are elevated. In this fashion, paracetamol acts as a pro-drug for a cannabimimetic metabolite. This action may be partially or fully responsible for the analgesic effects of paracetamol.
- ↑ Devane WA, Hanus L, Breuer A, Pertwee RG, Stevenson LA, Griffin G, Gibson D, Mandelbaum A, Etinger A, Mechoulam R (1992). "Isolation and structure of a brain constituent that binds to the cannabinoid receptor". Science. 258 (5090): 1946–9. doi:10.1126/science.1470919. PMID 1470919. Unknown parameter
- ↑ Mechoulam R, Fride E (1995). "The unpaved road to the endogenous brain cannabinoid ligands, the anandamides". In Pertwee RG. Cannabinoid receptors. Boston: Academic Press. pp. 233–258. ISBN 0-12-551460-3.
- ↑ 3.0 3.1 Template:Cite doi
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- ↑ allet PE, Beninger RJ (1996). "The endogenous cannabinoid receptor agonist anandamide impairs memory in rats". Behavioural Pharmacology. 7 (3): 276–284.
- ↑ Piomelli D (2004). "THC: moderation during implantation". Nat. Med. 10 (1): 19–20. doi:10.1038/nm0104-19. PMID 14702623. Unknown parameter
- ↑ El-Talatini MR, Taylor AH, Konje JC (2010). "The relationship between plasma levels of the endocannabinoid, anandamide, sex steroids, and gonadotrophins during the menstrual cycle". Fertil. Steril. 93 (6): 1989–96. doi:10.1016/j.fertnstert.2008.12.033. PMID 19200965. Unknown parameter
- ↑ Mahler SV, Smith KS, Berridge KC (2007). "Endocannabinoid hedonic hotspot for sensory pleasure: anandamide in nucleus accumbens shell enhances 'liking' of a sweet reward". Neuropsychopharmacology. 32 (11): 2267–78. doi:10.1038/sj.npp.1301376. PMID 17406653. Unknown parameter
- ↑ De Petrocellis L, Melck D, Palmisano A, Bisogno T, Laezza C, Bifulco M, Di Marzo V (1998). "The endogenous cannabinoid anandamide inhibits human breast cancer cell proliferation". Proc. Natl. Acad. Sci. U.S.A. 95 (14): 8375–80. doi:10.1073/pnas.95.14.8375. PMC 20983. PMID 9653194. Unknown parameter
- ↑ Natarajan V, Reddy PV, Schmid PC, Schmid HH (1982). "N-Acylation of ethanolamine phospholipids in canine myocardium". Biochim. Biophys. Acta. 712 (2): 342–55. PMID 7126608. Unknown parameter
- ↑ Cadas H, di Tomaso E, Piomelli D (1997). "Occurrence and biosynthesis of endogenous cannabinoid precursor, N-arachidonoyl phosphatidylethanolamine, in rat brain". J. Neurosci. 17 (4): 1226–42. PMID 9006968. Unknown parameter
- ↑ Berger A, Crozier G, Bisogno T, Cavaliere P, Innis S, Di Marzo V (2001). "Anandamide and diet: inclusion of dietary arachidonate and docosahexaenoate leads to increased brain levels of the corresponding N-acylethanolamines in piglets". Proc. Natl. Acad. Sci. U.S.A. 98 (11): 6402–6. doi:10.1073/pnas.101119098. PMC 33480. PMID 11353819. Unknown parameter
- ↑ Osei-Hyiaman D, DePetrillo M, Pacher P, Liu J, Radaeva S, Bátkai S, Harvey-White J, Mackie K, Offertáler L, Wang L, Kunos G (2005). "Endocannabinoid activation at hepatic CB1 receptors stimulates fatty acid synthesis and contributes to diet-induced obesity". J. Clin. Invest. 115 (5): 1298–305. doi:10.1172/JCI23057. PMC 1087161. PMID 15864349. Unknown parameter
- ↑ Template:Cite doi
- ↑ Bertolini A, Ferrari A, Ottani A, Guerzoni S, Tacchi R, Leone S (2006). "Paracetamol: new vistas of an old drug". CNS Drug Rev. 12 (3–4): 250–75. doi:10.1111/j.1527-3458.2006.00250.x. PMID 17227290.
- ↑ Sinning C, Watzer B, Coste O, Nüsing RM, Ott I, Ligresti A, Di Marzo V, Imming P (2008). "New analgesics synthetically derived from the paracetamol metabolite N-(4-hydroxyphenyl)-(5Z,8Z,11Z,14Z)-icosatetra-5,8,11,14-enamide". J. Med. Chem. 51 (24): 7800–5. doi:10.1021/jm800807k. PMID 19053765. Unknown parameter
- Could anandamide be the missing link to "runner's high"? Accessed 2008-10-18
cs:Anandamid de:Anandamid it:Anandamide he:אנאנדמיד hu:Anandamid nl:Anandamide no:Anandamid fi:Anandamidi sv:Anandamid ur:Anandamide
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