Conversion of arachidonic acid to tetradecadienoic acid by peroxisomal oxidation
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Add time:07/30/2019 Source:sciencedirect.com
Human skin fibroblasts convert [5,6,8,9,11,12,14,15-3H]arachidonic acid to two radiolabeled polar metabolites that accumulate in the culture medium. Previous studies identified the most abundant of these products as 4,7,10-hexadecatrienoic acid (16:3). We have now identified the second metabolite as 5,8-tetradecadienoic acid (14:2). Fibroblasts deficient in mitochondrial long-chain acyl coenzyme A dehydrogenase produce increased amounts of 14:2 from arachidonic acid. By contrast, Zellweger fibroblasts which are deficient in peroxisomal β-oxidation do not convert arachidonic acid to either 14:2 or 16:3. These results demonstrate that 14:2 can be synthesized from arachidonic acid, that this oxidative process occurs in the peroxisomes, and that the pathway does not function in Zellweger's syndrome and similar diseases where there is a genetic deficiency in peroxisomal β-oxidation.
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