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Any of several lipid compounds that contain 20 carbon atoms, are related to prostaglandins, and mediate the inflammatory response.

[leuko(cyte) + triene, a compound containing three double bonds (tri- + -ene).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biochemistry) one of a class of products of metabolic conversion of arachidonic acid; the active constituents of slow-reacting substance, responsible for bronchial constriction, contraction of smooth muscle, and inflammatory processes
[C20: from leukocyte, in which they were discovered + triene from the conjugated triene unit that they contain]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


or leu•co•tri•ene

(ˌlu kəˈtraɪ in)

a lipid, C20H30O3, produced by white blood cells in an immune response to antigens, that contributes to allergic asthma and inflammatory reactions.
[1975–80; leuko- + triene (see tri-, -ene)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Akari is a biopharmaceutical company focused on developing inhibitors of acute and chronic inflammation, specifically for the treatment of rare and orphan diseases, in particular those where the complement (C5) or leukotriene (LTB4) systems, or both complement and leukotrienes together, play a primary role in disease progression.
Leukotrienes activate by binding to G protein-coupled receptors present on the surfaces of airway cells.
When activated, mast cells release many inflammatory mediators as histamine, proteases, prostaglandins, leukotrienes and cytokines (3).
Specifically, the scientists looked at the relationship between tau proteins and molecules known as leukotrienes, which can cause damage to nerve cells as brain diseases develop.
The researchers landed on their breakthrough after discovering that inflammatory molecules known as leukotrienes are deregulated in Alzheimer's disease and related dementias.
Unlike NSAIDS, which block only prostaglandins, glucocorticoids not only inhibit prostaglandins but also thromboxanes and leukotrienes.14 Prednisolone inhibits phospholipase A2 and decrease leukotriene and prostaglandin synthesis, reducing chemotaxis of polymorphonuclear leukocytes.
In 1979 substances called leukotrienes were discovered to be the principal cause of the symptoms of allergic and inflammatory conditions.
Inflammation itself arises from myriad etiologic pathways, with multiple inflammatory mediators potentially involved, including histamines, cytokines, eicosanoids (for example, prostaglandins, thromboxanes, and leukotrienes), complement cascade components, kinins, fibrinopeptide enzymes, nuclear factor-kappa B, and free radicals.
AZD9898 could enable us to offer a new personalised treatment for patients whose condition is driven by the dysregulation of leukotrienes, said Marcus Schindler, Vice President of AstraZeneca's Respiratory, Inflammation and Autoimmunity Innovative Medicines Unit.
The leukotrienes (LTs) are lipid mediators belonging to a large family of molecules named eicosanoids--from the Greek word "eicosa" meaning 20--as they are generated from the arachidonic acid (AA), a carbon-20 polyunsaturated fatty acid, through the 5-lipoxygenase (5-LO) pathway [1,2].
The products of this "uncontrolled arachidonic acid cascade" include prostaglandins, thromboxanes and leukotrienes. Levels of prostaglandin, and leukotriene [B.sub.4] and [C.sub.4] are increased in the hippocampus of epileptic patients and in the cerebrospinal fluid of children with febrile seizures (6,7).
Derivatization of aldehydes [n-aliphatic aldehydes (C6-C12), malondialdehyde (MDA), 4-hydroxynonenal (4-HNE), and 4-hydroxyhexenal (4-HHE)] and compounds with a carboxyl group in the structure [8-isoprostane (8-iso-[PGF.sub.2[alpha]]), cysteinyl leukotrienes C, D, and E (Cys-LTs), and leukotriene [B.sub.4] (LTB4)] was carried out using derivatization with Girard's reagent T (GirT) in the presence of N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide.