NeuroD2 regulates the development of hippocampal mossy fiber synapses.

NeuroD2 regulates the development of hippocampal mossy fiber synapses.
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DOI:
10.1186/1749-8104-7-9
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发表时间:
2012-02-27
期刊:
影响因子:
3.6
通讯作者:
Ghosh A
Ghosh A
中科院分区:
生物学3区
文献类型:
--
作者:
Wilke SA;Hall BJ;Antonios JK;Denardo LA;Otto S;Yuan B;Chen F;Robbins EM;Tiglio K;Williams ME;Qiu Z;Biederer T;Ghosh A

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神经回路的组装需要遗传决定机制和活动依赖机制的协同作用。钙调节的转录可能连接这些过程,但对突触特异性特性的分化的特定转录因子的影响知之甚少。在这里,我们的特点的影响NeuroD2,钙依赖性转录因子,在调节海马苔藓纤维(MF)突触的结构和功能成熟。使用NeuroD2空小鼠和体内慢病毒介导的基因敲除,我们证明了NeuroD2在接受MF输入的CA3树突棘形成中的关键作用。我们还使用来自CA3神经元的电生理记录,同时刺激MF轴突,以表明NeuroD2调节MF突触的功能特性的分化。最后,我们发现NeuroD2调节PSD95在海马神经元中的表达,并且PSD95在体内的功能丧失再现了在NeuroD2缺失小鼠中观察到的CA3神经元棘缺陷。这些实验将NeuroD2鉴定为调节体内MF突触的结构和功能分化的关键转录因子。
The assembly of neural circuits requires the concerted action of both genetically determined and activity-dependent mechanisms. Calcium-regulated transcription may link these processes, but the influence of specific transcription factors on the differentiation of synapse-specific properties is poorly understood. Here we characterize the influence of NeuroD2, a calcium-dependent transcription factor, in regulating the structural and functional maturation of the hippocampal mossy fiber (MF) synapse. Using NeuroD2 null mice and in vivo lentivirus-mediated gene knockdown, we demonstrate a critical role for NeuroD2 in the formation of CA3 dendritic spines receiving MF inputs. We also use electrophysiological recordings from CA3 neurons while stimulating MF axons to show that NeuroD2 regulates the differentiation of functional properties at the MF synapse. Finally, we find that NeuroD2 regulates PSD95 expression in hippocampal neurons and that PSD95 loss of function in vivo reproduces CA3 neuron spine defects observed in NeuroD2 null mice. These experiments identify NeuroD2 as a key transcription factor that regulates the structural and functional differentiation of MF synapses in vivo.
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