Summary
The in vitro metabolism of leukotriene B4 is initiated by ω-hydroxylation. This reaction is followed by oxidation of the ω-hydroxyl group to a carboxyl group. In vivo extensive β-oxidation occurs and the main excreted products after administration of leukotriene B4 are water and carbon dioxide.
Experiments performed in vitro and in vivo have demonstrated that a major pathway of metabolism of the glutathione containing leukotrienes involves modifications of the tripeptide substituent. The metabolic alterations are initiated by enzymatic elimination of the N-terminal y-glutamyl residue, catalyzed by the enzyme γ-glutamyl transferase. This reaction is followed by hydrolysis of the remaining peptide bond resulting in elimination of the C-terminal glycine residue. The enzyme catalyzing the latter reaction is a membrane bound dipeptidase which occurs in kidney and other tissues. The product formed by these reactions, leukotriene E4, has been tentatively identified as a urinary metabolite in man following intravenous administration of leukotriene C4. In rats, the two major fecal metabolities of leukotriene C44 were characterized as being N-acetyl leukotriene E4 and N-acetyl 11-trans leukotriene E4. These compounds are formed in reactions between leukotriene E4 or 11-trans leukotriene E4 and acetyl coenzyme A. The reactions are catalyzed by a membrane bound enzyme present in liver, kidney and other tissues.
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Hammarström, S., Örning, L. & Bernström, K. Metabolism of leukotrienes. Mol Cell Biochem 69, 7–16 (1985). https://doi.org/10.1007/BF00225922
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DOI: https://doi.org/10.1007/BF00225922