12-Keto-tetrahydro-leukotriene B4
IUPAC 名称
(5S)-5-hydroxy-12-oxoicosa-6,8-dienoic acid
描述
12-keto-tetrahydro-Leukotriene B4 is an inactivated enzymatic metabolite of leukotriene B4(LTB4), product of the human liver enzyme leukotriene B4 (LTB4) 12-hydroxydehydrogenase, also found in the porcine kidney and other mammals. LTB4 is the major metabolite in neutrophil polymorphonuclear leukocytes. Leukotrienes are metabolites of arachidonic acid derived from the action of 5-LO (5-lipoxygenase). The immediate product of 5-LO is LTA4 (leukotriene A4), which is enzymatically converted into either LTB4 (leukotriene B4) by LTA4 hydrolase or LTC4 (leukotriene C4) by LTC4 synthase. The regulation of leukotriene production occurs at various levels, including expression of 5-LO, translocation of 5-LO to the perinuclear region and phosphorylation to either enhance or inhibit the activity of 5-LO. Biologically active LTB4 is metabolized by w-oxidation carried out by specific cytochrome P450s (CYP4F) followed by beta-oxidation from the w-carboxy position and after CoA ester formation. (PMID: 17623009, 8394361, 9667737)
Leukotrienes are eicosanoids. The eicosanoids consist of the prostaglandins (PGs), thromboxanes (TXs), leukotrienes (LTs) and lipoxins (LXs). The PGs and TXs are collectively identified as prostanoids. Prostaglandins were originally shown to be synthesized in the prostate gland, thromboxanes from platelets (thrombocytes) and leukotrienes from leukocytes, hence the derivation of their names. All mammalian cells except erythrocytes synthesize eicosanoids. These molecules are extremely potent, able to cause profound physiological effects at very dilute concentrations. All eicosanoids function locally at the site of synthesis, through receptor-mediated G-protein linked signaling pathways. [HMDB]
异构
[H][C@](O)(CCCC(O)=O)C=CC=CCCC(=O)CCCCCCCC
InChI标识符
InChI=1S/C20H34O4/c1-2-3-4-5-6-9-13-18(21)14-10-7-8-11-15-19(22)16-12-17-20(23)24/h7-8,11,15,19,22H,2-6,9-10,12-14,16-17H2,1H3,(H,23,24)/t19-/m1/s1
键
RRTYEHFGQWNQKK-LJQANCHMSA-N