Effects of ELOVL4 gene overexpress on the synthesis efficiency of n3 and n6 very long chain polyunsaturated fatty acids
10.3980/j.issn.1672-5123.2014.08.05
- VernacularTitle:ELOVL4基因过表达对 n3和 n6超长链多不饱和脂肪酸生物合成效率的影响
- Author:
Man, YU
;
Wei, LIN
;
Bo, CHEN
;
Zheng-Zheng, WU
- Publication Type:Journal Article
- Keywords:
eicosapentaenoic acid;
arachidonic acid;
ELOVL4 gene;
Stargardt’s disease;
very long chain polyunsaturated fatty acid
- From:
International Eye Science
2014;(8):1386-1390
- CountryChina
- Language:Chinese
-
Abstract:
AIM:To compare the synthesis efficiency of n3 and n6 very long chain polyunsaturated fatty acid ( VLC-PUFA ) by overexpressing ELOVL4 protein, providing guidance for treating Stargardt-like macular dystrophy (STGD3).
METHODS:To establish recombinant adenovirus with the ELOVL4 protein and green fluorescent protein, transferred into cultured PC12 cells. The cells were divided into 3 groups: PC12, PC12 + Ad- GFP and PC12 + Ad-ELOVL4, former two groups serve as controls. ELOVL4 gene expression was quantified by qRT-PCRs. ELOVL4 protein was analyzed by Western - Blot ( WB ) . The transduced cells were treated with both EPA and AA (1:1). After 48h of incubation, cells were collected, total lipids extracted and fatty acid methyl esters prepared and analyzed by gas chromatography-mass spectrometry ( GC-MS) .
RESULTS:When supplemented together, 20:5n3 (EPA) and 20:4n6 ( AA) were efficiently taken up at almost the same amounts in the PC12 cells regardless of ELOVL4 expression. The ELOVL4-expressing cells elongated both EPA and AA to a series of n3 and n6 VLC-PUFAs. From 20:5n3/EPA, 34:5n3 and 36:5n3 account for 0. 71% and 1.6%, respectively. From 20:4n6/DHA, 34:4n6 and 36:4n6 were only 0. 46% and 0. 61%, respectively. The total relative mol% of n3 VLC-PUFAs synthesized from EPA was almost two times that of n6 VLC-PUFAs synthesized from AA.
CONCLUSION: ELOVL4 protein preferentially elongates n3 PUFA to VLC - PUFAs over n6 PUFA. Dietary supplementation of appropriate n3/n6 PUFAs may provide STGD3 patients with some therapeutic benefits.
