leukotriene e4

Leukotriene E4 (LTE4) (LTE4) is produced by the action of dipeptidyl peptidase on LTD4 and is a component of the Slow Reactive Substance of Anaphylaxis (SRS-A).LTE4 is present in plasma and urine and can be used to detect asthma.

Slow isomerization of the C-11 double bond of LTE4 leads to the formation of 11-trans LTE4. 11-trans LTE4 is equipotent to LTE4 in contracting guinea pig ileum.

N-acetyl Leukotriene E4 is an endogenous metabolite of Leukotriene E4, which is excreted mainly through bile, and is one to three orders of magnitude less active than Leukotriene E4, causing constriction of the airways.

Leukotrienes (LTs) are a group of acute inflammatory mediators derived from arachidonic acid in leukocytes. The majority of these metabolites are formed through the 5-lipoxygenase (5-LO) pathway. 14,15-LTE4 is a metabolite of 14,15-LTC4 and 14,15-LTD4, an alternate class of LTs synthesized by a pathway involving the dual actions of 15- and 12-LOs on arachidonic acid via 15-HpETE and 14,15-LTA4 intermediates. These metabolites are classified as eoxins because they are formed mostly by eosinophils. Mast cells and nasal polyps can synthesize 14,15-LTC4 as well, however metabolism to 14,15-LTE4 in these cells and tissue has not been documented. 14,15-LTE4 increases vascular permeability of human endothelial cell monolayers with about 10-fold less potency than LTC4, but approximately 100-fold greater potency than histamine.

Pirodomast is a thromboxane A (TXA2) synthase inhibitor. Pirodomast inhibits leukotriene (LT) D4, C4, E4 formation and thromboxane B2 (TXB2) activity, but is weakly or ineffectively antagonistic to guinea pig bronchospasm induced by histamine, methacholine, serotonin, LTC4, or platelet-activating factor. Pirodomast is a potential antiallergic compound. Pirodomast had only weak relaxant activity on guinea pig trachea in vitro. Pirodomast is a potential antiallergic compound that inhibits the protein hydrolyzing activity of trypsin in vitro, prevents antigen-induced immediate and late asthmatic responses in allergic sheep in vivo, and inhibits antigen-induced airway hyperresponsiveness to histamine and carbachol in allergic sheep.

Cilastatin (MK0791) is a renal dehydropeptidase-I and leukotriene D4 dipeptidase inhibitor. Since the antibiotic, IMIPENEM, is hydrolyzed by dehydropeptidase-I, which resides in the brush border of the renal tubule, cilastatin is administered with imipenem to increase its effectiveness. The drug also inhibits the metabolism of leukotriene D4 to leukotriene E4.

SR 2640 hydrochloride is a competitive antagonist of leukotriene D4 and E4 and can be used in studies about leukotrienes in human asthma.

LY 203647 is a antagonist of leukotriene D4 and E4 receptor.

LY 245769 is an inhibitor of leukotriene E4 (LTE4).

Leukotriene E-4 sulfone is a synthetic leukotriene.

Ritolukast (Wy-48252), an orally active aerosol leukotriene (LTD 4/E 4) receptor antagonist, effectively inhibits bronchoconstriction induced by aerosol LTD 4 in guinea pigs, demonstrating an ID 50 of 0.5mg/kg [1].