leukotriene e4

Leukotriene E4 (LTE4)（LTE4）通过 二肽酶对LTD4 上的作用生成，是过敏性休克慢反应物质（SRS-A）的成分之一。LTE4 存在于血浆和尿液中，可用于检测哮喘。

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.

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（N-乙酰白三烯 E4）是Leukotriene E4的内源性代谢物，主要通过胆汁排泄，其活性比Leukotriene E4低1~3个数量级，能引起气管的收缩。

Leukotriene E-4 sulfone is a synthetic leukotriene.

Pirodomast 是血栓素 A（TXA2）合成酶抑制剂。Pirodomast 能抑制白三烯（LT）D4、C4、E4 的形成和血栓素 B2（TXB2）的活性，但对组胺、甲氧胆碱、血清素、LTC4 或血小板活化因子诱导的豚鼠支气管痉挛的拮抗作用较弱或无效。Pirodomast 在体外对豚鼠气管只有微弱的松弛活性。Pirodomast 是一种潜在的抗过敏化合物，在体外可抑制胰蛋白酶的蛋白水解活性，在体内可阻止抗原诱发过敏绵羊的即时和晚期哮喘反应，抑制抗原诱导的过敏绵羊对组胺和卡巴胆碱的气道高反应性。

Cilastatin (MK0791) 是一种可逆的竞争性的肾脏脱氢肽酶 I 抑制剂，IC50为 0.1 μM。它抑制细菌金属叶内酰胺酶CphA 的IC50为 178 μM，可用作抗菌辅助剂。

SR 2640 hydrochloride 是白三烯 D4 和 E4 的竞争性拮抗剂，可用于研究人类哮喘中的白三烯。

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

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

Ritolukast (Wy-48252) 是一种口服活性的气溶胶白三烯 (LTD4 E4) 受体拮抗剂，可用于抑制气溶胶 LTD4 引起的豚鼠支气管收缩，ID50 为 0.5 mg kg。