Survival of adult neurons lacking cholesterol synthesis in vivo.

Survival of adult neurons lacking cholesterol synthesis in vivo.
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DOI:
10.1186/1471-2202-8-1
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发表时间:
2007-01-02
期刊:
影响因子:
2.4
通讯作者:
Nave KA
Nave KA
中科院分区:
医学4区
文献类型:
--
作者:
Fünfschilling U;Saher G;Xiao L;Möbius W;Nave KA

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胆固醇是所有哺乳动物质膜的重要组成部分,在大脑中高度富集。无论是在发育过程中,还是在成人中,脑胆固醇都来自局部胆固醇合成,而不是从循环中摄取。然而,神经元和神经胶质细胞对脑总胆固醇代谢的贡献尚不清楚。在小鼠中使用条件基因失活,我们破坏了角鲨烯合酶基因(fdft1),这是关键的胆固醇合成,在小脑颗粒细胞和一些小脑前核。突变小鼠没有表现出神经元变性的组织学迹象,显示超微结构正常的突触,并表现出正常的运动协调。这表明这些成年神经元不需要细胞自主胆固醇合成来生存或发挥功能。我们的结论是,至少有一些成年神经元不再需要内源性胆固醇的合成,并可以完全满足他们的胆固醇需要从他们周围的摄取。胶质细胞是中枢神经系统中胆固醇的可能来源。
Cholesterol, an essential component of all mammalian plasma membranes, is highly enriched in the brain. Both during development and in the adult, brain cholesterol is derived from local cholesterol synthesis and not taken up from the circulation. However, the contribution of neurons and glial cells to total brain cholesterol metabolism is unknown. Using conditional gene inactivation in the mouse, we disrupted the squalene synthase gene (fdft1), which is critical for cholesterol synthesis, in cerebellar granule cells and some precerebellar nuclei. Mutant mice showed no histological signs of neuronal degeneration, displayed ultrastructurally normal synapses, and exhibited normal motor coordination. This revealed that these adult neurons do not require cell-autonomous cholesterol synthesis for survival or function. We conclude that at least some adult neurons no longer require endogenous cholesterol synthesis and can fully meet their cholesterol needs by uptake from their surrounding. Glia are a likely source of cholesterol in the central nervous system.
DOI: 10.1186/1471-2202-8-1
发表时间: 2007-01-02
期刊: BMC neuroscience
影响因子: 2.4
作者:
Fünfschilling U;Saher G;Xiao L;Möbius W;Nave KA
通讯作者: Nave KA
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