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Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Adrenoleukodystrophy. The chain shortening of erucic acid (22:1(n-9)) and adrenic acid (22:4(n-6)) is deficient in neonatal adrenoleukodystrophy and normal in X-linked adrenoleukodistrophy skin fibroblasts.
Biochimica et Biophysica Acta 1989 March 15
The metabolism of long chain unsaturated fatty acids was studied in cultured fibroblasts from patients with X-linked adrenoleukodystrophy (ALD) and with neonatal ALD. By using [14-14C] erucic acid (22:1(n-9)) as substrate it was shown that the peroxisomal beta-oxidation, measured as chain shortening, was impaired in cells from patients with neonatal ALD. The beta-oxidation of adrenic acid (22:4(n-6)), measured as acid-soluble products, was also reduced in the neonatal ALD cells. The peroxisomal beta-oxidation of [14-14C]erucic acid (22:1(n-9)) and [2-14C]adrenic acid (22:4(n-6)) was normal in cells from X-ALD patients. The beta-oxidation, esterification and chain elongation of [1-14C]arachidonic acid (20:4(n-6)) and [1-14C]eicosapentaenoic acid (20:5(n-3)) was normal in both X-linked ALD and in neonatal ALD. Previous studies suggest that the activation of very long chain fatty acids by a lignoceryl (24:0)-CoA ligase is deficient in X-linked ALD, while the peroxisomal beta-oxidation enzymes are deficient in neonatal ALD. The present results suggest that the peroxisomal very long-chain acyl-CoA ligase is not required for activation of unsaturated C20 and C22 fatty acids and that these fatty acids can be efficiently activated by the long chain acyl-(palmityl)-CoA ligase.
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