Brain phenotype of transgenic mice overexpressing cystathionine β-synthase.

Brain phenotype of transgenic mice overexpressing cystathionine β-synthase.
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DOI:
10.1371/journal.pone.0029056
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
London J
London J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Régnier V;Billard JM;Gupta S;Potier B;Woerner S;Paly E;Ledru A;David S;Luilier S;Bizot JC;Vacano G;Kraus JP;Patterson D;Kruger WD;Delabar JM;London J

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胱硫醚β-合酶 (CBS) 基因位于人类染色体 21q22.3 上,是在唐氏综合症 (DS) 认知谱中发挥作用的良好候选基因:它在唐氏综合症 (DS) 个体的大脑中过度表达,并编码含硫氨基酸 (SAA) 代谢的关键酶,这是对多种大脑生理过程很重要的途径。在这里,我们研究了转基因小鼠系 (60.4P102D1) 中 CBS 过度表达的神经后果,该转基因小鼠系在其内源性调控区域的控制下表达人类 CBS 基因。这些小鼠不同大脑区域的总 CBS 蛋白增加了约 2 倍,小脑和海马中的 CBS 活性增加了约 1.3 倍。没有观察到SAA代谢的重大紊乱,并且转基因小鼠在转棒测试和被动回避测试中表现出正常行为。然而,我们发现 60.4P102D1 系促进了海马突触可塑性。我们证明 CBS 过度表达对海马神经元网络具有功能影响。这些结果为 CBS 基因的功能提供了新的线索,并提出了一个有趣的可能性,即 CBS 过度表达可能对 DS 的某些认知功能产生有利影响。
The cystathionine β-synthase (CBS) gene, located on human chromosome 21q22.3, is a good candidate for playing a role in the Down Syndrome (DS) cognitive profile: it is overexpressed in the brain of individuals with DS, and it encodes a key enzyme of sulfur-containing amino acid (SAA) metabolism, a pathway important for several brain physiological processes. Here, we have studied the neural consequences of CBS overexpression in a transgenic mouse line (60.4P102D1) expressing the human CBS gene under the control of its endogenous regulatory regions. These mice displayed a ∼2-fold increase in total CBS proteins in different brain areas and a ∼1.3-fold increase in CBS activity in the cerebellum and the hippocampus. No major disturbance of SAA metabolism was observed, and the transgenic mice showed normal behavior in the rotarod and passive avoidance tests. However, we found that hippocampal synaptic plasticity is facilitated in the 60.4P102D1 line. We demonstrate that CBS overexpression has functional consequences on hippocampal neuronal networks. These results shed new light on the function of the CBS gene, and raise the interesting possibility that CBS overexpression might have an advantageous effect on some cognitive functions in DS.
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