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Leukotriene A₄
Names
	Preferred IUPAC name 4-{(2S,3S)-3-[(1E,3E,5Z,8Z)-Tetradeca-1,3,5,8-tetraen-1-yl]oxiran-2-yl}butanoic acid
Identifiers
CAS Number	72059-45-1 ;
3D model (JSmol)	Interactive image;
Abbreviations	LTA4
ChEBI	CHEBI:15651 ;
ChemSpider	4444074 ;
IUPHAR/BPS	5214;
KEGG	C00909 ;
MeSH	D017572
PubChem CID	5280383;
UNII	7Y7MPZ6563 ;
CompTox Dashboard (EPA)	DTXSID40903945 ;
	InChI InChI=1S/C20H30O3/c1-2-3-4-5-6-7-8-9-10-11-12-13-15-18-19(23-18)16-14-17-20(21)22/h6-7,9-13,15,18-19H,2-5,8,14,16-17H2,1H3,(H,21,22)/b7-6-,10-9-,12-11+,15-13+/t18-,19-/m0/s1 Key: UFPQIRYSPUYQHK-WAQVJNLQSA-N ; InChI=1/C20H30O3/c1-2-3-4-5-6-7-8-9-10-11-12-13-15-18-19(23-18)16-14-17-20(21)22/h6-7,9-13,15,18-19H,2-5,8,14,16-17H2,1H3,(H,21,22)/b7-6-,10-9-,12-11+,15-13+/t18-,19-/m0/s1 Key: UFPQIRYSPUYQHK-WAQVJNLQBZ;
	SMILES CCCCC/C=C\C/C=C\C=C\C=C\[C@H]1[C@@H](O1)CCCC(=O)O;
Properties
Chemical formula	C20H30O3
Molar mass	318.457 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Leukotriene A₄ (LTA₄) is a leukotriene, and is the precursor for the productions of leukotriene B₄ (LTB₄) and leukotriene C₄ (LTC₄).

Biosynthesis

Following the biosynthesis of eicosanoid, triggered as a result of infection or inflammation, the resulting arachidonic acid substrate is released from the cell membrane phospholipid will enter the lipooxygenase pathway to produce leukotriene A₄.^[1]^[2] In this pathway, arachidonic acid is converted into 5-hydroperoxyeicosatetraenoic acid (5-HPETE) as a result of a catalytic complex consisting of the enzyme 5-lipoxygenase (5-LO) and 5-lipoxygenase-activating protein (FLAP) in the presence of ATP and calcium ions.^[1]^[2]^[3] The resulting 5-HPETE yields the unstable allylic epoxide substrate LTA₄^[4] which is quickly hydrolyzed by the leukotriene A4 hydrolase (LTA₄H) enzyme to produce LTB₄, or synthesized by leukotriene C4 synthase (LTC₄S) with the addition of glutathione to produce LTC₄ which can be further metabolized to produce leukotriene D₄ (LTD₄) and leukotriene E₄ (LTE₄).^[5]^[4] The lipooxygenase pathway is one of several possible pathways including the cyclooxygenase pathway (also PGH synthase pathway), isoprostane pathway, and cytochrome P450 epoxygenases pathway following the arachidonic acid metabolism,^[6] but is the only pathway in which the subsequent steps will lead to the production of leukotrienes.

References

^ ^a ^b Abu, J.I.; Konje, J.C. (March 2000). "Leukotrienes in gynaecology: the hypothetical value of anti-leukotriene therapy in dysmenorrhoea and endometriosis". Human Reproduction Update. 6 (2): 200–205. doi:10.1093/humupd/6.2.200. ISSN 1355-4786. PMID 10782578.
^ ^a ^b Marx, J.L. (1982-03-12). "The leukotrienes in allergy and inflammation". Science. 215 (4538): 1380–1383. Bibcode:1982Sci...215.1380M. doi:10.1126/science.6278589. ISSN 0036-8075. PMID 6278589.
^ Nicolls, Mark R.; Voelkel, Norbert F.; Peters-Golden, Marc; Rajadas, Jayakumar; Fridlib, Marina; Inayathullah, Mohammed; Zamanian, Roham T.; Rabinovitch, Marlene; Farkas, Laszlo (2013-08-28). "Blocking Macrophage Leukotriene B4 Prevents Endothelial Injury and Reverses Pulmonary Hypertension". Science Translational Medicine. 5 (200): 200ra117. doi:10.1126/scitranslmed.3006674. ISSN 1946-6234. PMC 4016764. PMID 23986401.
^ ^a ^b Serhan, C.N.; Rouzer, C.A.; Lindgren, J.A.; Dahlen, S.E.; Samuelsson, B. (1987-09-04). "Leukotrienes and lipoxins: structures, biosynthesis, and biological effects". Science. 237 (4819): 1171–1176. Bibcode:1987Sci...237.1171S. doi:10.1126/science.2820055. ISSN 0036-8075. PMID 2820055.
^ Nicolls, Mark R.; Dixon, J. Brandon; Kitajewski, Jan; Peters-Golden, Marc; Voelkel, Norbert F.; Dhillon, Gundeep S.; Zamanian, Roham T.; Feroze, Abdullah H.; Nepiyushchikh, Zhanna (2017-05-10). "Leukotriene B4 antagonism ameliorates experimental lymphedema". Science Translational Medicine. 9 (389): eaal3920. doi:10.1126/scitranslmed.aal3920. ISSN 1946-6234. PMID 28490670.
^ O'Connor, J. Patrick; Lysz, Thomas (September 2008). "Celecoxib, NSAIDs and the skeleton". Drugs of Today. 44 (9): 693–709. doi:10.1358/dot.2008.44.9.1251573. ISSN 1699-3993. PMID 19137124.