12-Keto-leukotriene B4

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12-Keto-leukotriene B4
2D structure for 12-Keto-leukotriene B4
Chemical Name	(5S,6Z,8E,10E,14Z)-5-hydroxy-12-oxoicosa-6,8,10,14-tetraenoic acid
Chemical Formula	C₂₀H₃₀O₄
CAS Number	136696-10-1
Chemical Information	HMDB04234
Biochemical Taxonomy	Leukotrienes
Functional Taxonomy	Not Available
Nutritional Taxonomy	Not Available
Metabolic Pathways	Not Available
Biofluid Location	Not Available
Tissue Location	Not Available
Normal Biofluid Concentrations	Not Available
Normal Tissue Concentrations	Not Available
Diseases / Conditions Related to Nutrition	Not Available
Other (Monogenic Disorders)	Not Available
Abnormal Biofluid Concentrations	Not Available
Abnormal Tissue Concentrations	Not Available
Physiological Processes	Not Available

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Introduction

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12-Keto-leukotriene B4 is formed when leukotriene B4 (LTB4) is metabolized by beta-oxidation. 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: 8632343, 9667737)