IDH1 regulates phospholipid metabolism in developing astrocytes

NEUROSCIENCE LETTERS

卷:582

Article

Bogdanovic, Elena¹  Sadri, Ali-Reza¹  Catapano, Michael¹  Vance, Jean E.²  Jeschke, Marc G.¹ 

[1] Sunnybrook Hlth Sci Ctr, Sunnybrook Res Inst, Toronto, ON M4N 3M5, Canada

[2] Univ Alberta, Dept Med, Grp Mol & Cell Biol Lipids, Edmonton, AB T6G 2S2, Canada

关键词: Phospholipid;    IDH1;    Embryo;    Astrocyte;    Brain;   

DOI  :  10.1016/j.neulet.2014.09.015

来源: Elsevier

【 摘 要 】

Isocitrate dehydrogenase 1 (IDH1) is an evolutionarily conserved enzyme that catalyzes the interconversion of isocitrate to alpha-ketoglutarate with the concomitant reduction of NADP(+) to NADPH. IDH1 has previously been shown to participate in lipid biosynthesis in various tissues such as the liver and adipose tissue. We examined the potential role of IDH1 in phospholipid metabolism in the brain. Here we show that IDH1 is highly expressed in the brain and astrocytes during embryonic development and the postnatal period and subsequently declines in adulthood. Silencing of IDH1 expression using siRNA in astrocytes isolated from E18.5 mouse cortices led to increased incorporation of [H-3]-palmitate into the phosphatidylcholines (PCs) and decreased the incorporation of [H-3]-palmitate into sphingomyelin and the phosphatidylethanolamines (PEs). In pulse-chase experiments, knock-down of IDH1 expression impaired the turnover of PCs and decreased the synthesis of PEs. The decrease in [H-3]-palmitate incorporation into PEs when IDH1 was knocked-down in astrocytes was not due to impairments within the CDP-ethanolamine pathway or in the rate of decarboxylation of phosphatidylserine (PS). In conclusion, our results reveal a role for IDH1 in the synthesis/turnover of phospholipids in developing astrocytes and highlight the lipid alterations resulting from the loss of wild-type IDH1 activity. (C) 2014 Elsevier Ireland Ltd. All rights reserved.

【 授权许可】

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