12hete

12-HETE ((±)12-HETE) 是 PGE2 的调节因子，具有抗血栓形成和促血栓形成作用，通过蛇毒 IIA 组磷脂酶 A2 诱导诱导 PGE2 释放和 COX-2 表达。12-HETE 还是一种神经调节剂，通过激活 NADPH 氧化酶和随后的生成激活视网膜细胞，诱导糖尿病视网膜病变的内皮功能障碍。

12(S)-HETE 是花生四烯酸的12-脂氧合酶代谢产物，对癌细胞增殖具有促有丝分裂作用，可增强血管紧张素 II 诱导的 BLT2 收缩（白三烯 B4小鼠动脉中 2 型受体）和 TP （血栓素受体） 介导的机制。12(S)-HETE促进动脉内皮细胞中超氧化物和异血栓素样代谢物的产生。

Biosynthesis of 12(R)-HETE in invertebrates is via lipoxygenation of arachidonic acid . In mammals, 12(R)-HETE can be produced by 12(R)-LOs and also by CYP450 oxidation. The activity of 12(R)-HETE in mammals is predominantly proinflammatory. 12(R)-HETE exhibits dose-dependent leukocyte chemotaxis at concentrations as low as 100 nM, and lowers intraocular pressure in rabbits.

12(S)-HETE is a product of arachidonic acid metabolism through the 12-lipoxygenase pathway. It is primarily found in platelets, leukocytes, and to a lesser extent in smooth muscle cells. It enhances tumor cell adhesion to endothelial cells, fibronectin, and the subendothelial matrix. tetranor-12(S)-HETE is the major β-oxidation product resulting from peroxisomal metabolism of 12(S)-HETE in numerous tissues, and Lewis lung carcinoma cells. No biological function has yet been determined for tetranor-12(S)-HETE. Some data indicate it may play a role in controlling the inflammatory response in injured corneas. In some diseases (e.g., Zellweger's Syndrome) peroxisomal abnormalities result in the inability of cells to metabolize 12(S)-HETE, which may be responsible for symptoms of the disease. The tetranor derivative of 12(S)-HETE is available as a research tool for the elucidation of the metabolic fate of its parent compound.

Metabolism of 12(R)-HETE in corneal tissue produces predominantly the compound resulting from the loss of four carbon atoms through β-oxidation from C-1. This metabolite is 8(R)-hydroxy hexadecatrienoic acid (8(R)-HHxTrE) or 2,3,4,5-tetranor 12(R)-HETE.