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. 1990 Apr;85(4):1173–1181. doi: 10.1172/JCI114550

Hydroxyeicosatetraenoic acid metabolism in cultured human skin fibroblasts. Evidence for peroxisomal beta-oxidation.

J A Gordon 1, P H Figard 1, A A Spector 1
PMCID: PMC296549  PMID: 2318972

Abstract

To determine whether the peroxisome is responsible for hydroxyeicosatetraenoic acid (HETE) oxidation, 12- and 15-HETE oxidation was measured in normal and peroxisomal deficient skin fibroblasts from patients with Zellweger's (cerebrohepatorenal) syndrome. When incubated for 1 h with normal fibroblasts, reverse phase HPLC indicated that 24% of the 12-HETE radioactivity was converted to one major polar metabolite. Chemical derivatization followed by reverse phase HPLC and TLC indicated that this metabolite is 8-hydroxyhexadecatrienoic acid [16:3(8-OH)]. Similarly, 33% of the added 15-HETE was also converted to a more polar metabolite. Neither 12- nor 15-HETE were converted to any metabolites by the peroxisomal deficient (Zellweger) cells. No defect in HETE oxidation was found in other human fibroblast cell lines with diverse metabolic abnormalities. Zellweger fibroblasts accumulated increased amounts of 12-HETE, compared with normal fibroblasts. As in the normal cells, most of the 12-HETE incorporated into Zellweger fibroblasts was present in the choline and ethanolamine phosphoglycerides. Protein synthesis, lysosomal acid lipase activity, and mitochondrial butyrate oxidation were not impaired in the Zellweger fibroblasts. Since the Zellweger cells do not convert 12- and 15-HETE to oxidative metabolites, peroxisomes appear to be the cellular organelle responsible for HETE oxidation.

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Selected References

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