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Effect of dietary polyunsaturated fatty acids on the expression of peroxisomal ABC transporters.

Abstract：

:Peroxisomal ABC transporters encoded by the ABCD genes are thought to participate in the import of specific fatty acids in the peroxisomal matrix. ABCD1 deficiency is associated with X-linked adrenoleukodystrophy (X-ALD), the most frequent peroxisomal disorder which is characterized by the accumulation of saturated very-long-chain fatty acids (VLCFA). ABCD2 (the closest homolog of ABCD1) and ABCD3 have been shown to have partial functional redundancy with ABCD1; only when overexpressed, they can compensate for VLCFA accumulation. Other lipids, for instance polyunsaturated fatty acids (PUFA), should be possible candidate substrates for the ABCD2 and ABCD3 gene products, ALDRP and PMP70 respectively. Moreover, PUFA, which are known regulators of gene expression, could therefore represent potent inducers of the ABCD genes. To test this hypothesis, littermates of n-3-deficient rats were subjected to an n-3-deficient diet or equilibrated diets containing ALA (alpha-linolenic acid, 18:3n-3) as unique source of n-3 fatty acids or ALA plus DHA (docosahexaenoic acid, 22:6n-3) at two different doses. We analyzed the expression of peroxisomal ABC transporters and of the peroxisomal acyl-CoA oxidase gene 1 (Acox1) in adrenals, brain and liver. Whatever the diet, we did not observe any difference in gene expression in adrenals and brain. However, the hepatic expression level of Abcd2 and Abcd3 genes was found to be significantly higher in the n-3-deficient rats than in the rats fed the ALA diet or the DHA supplemented diets. This was accompanied by important changes in hepatic fatty acid composition. In summary, the hepatic expression of Abcd2 and Abcd3 but not of Abcd1 and Abcd4 appears to be highly sensitive towards dietary PUFA. This difference could be linked to the substrate specificity of the peroxisomal ABC transporters and a specific involvement of Abcd2 and Abcd3 in PUFA metabolism.

journal_name

Biochimie

journal_title

Biochimie

authors

Leclercq S,Skrzypski J,Courvoisier A,Gondcaille C,Bonnetain F,André A,Chardigny JM,Bellenger S,Bellenger J,Narce M,Savary S

doi

10.1016/j.biochi.2008.05.022

subject

Has Abstract

pub_date

2008-10-01 00:00:00

pages

1602-7

issue

10

eissn

0300-9084

issn

1638-6183

pii

S0300-9084(08)00193-4

journal_volume

90

pub_type

杂志文章

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