Suprachiasmatic nucleus: cell autonomy and network properties.

Suprachiasmatic nucleus: cell autonomy and network properties.
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DOI:
10.1146/annurev-physiol-021909-135919
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发表时间:
2010
影响因子:
18.2
通讯作者:
Kay SA
Kay SA
中科院分区:
医学1区
文献类型:
--
作者:
Welsh DK;Takahashi JS;Kay SA

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视交叉上核(SCN)是哺乳动物的主要昼夜节律起搏器。分散培养的单个SCN神经元可以产生时钟基因表达和神经元放电的独立昼夜振荡。然而,SCN节律性取决于足够的膜去极化和细胞内钙和cAMP的水平。在完整的SCN中,细胞振荡被来自其他细胞的节律性突触输入同步和加强,导致SCN电路组织指定的不同相位和振幅的可重复的地形模式。SCN网络同步其组成的细胞振荡器,加强它们的振荡,通过改变它们的相位分布来响应光输入,增加它们对遗传扰动的鲁棒性,并提高它们的精度。因此,尽管单个SCN神经元可以是细胞自主的昼夜节律振荡器,但神经元网络特性对于SCN的正常功能是不可或缺的。
The suprachiasmatic nucleus (SCN) is the primary circadian pacemaker in mammals. Individual SCN neurons in dispersed culture can generate independent circadian oscillations of clock gene expression and neuronal firing. However, SCN rhythmicity depends on sufficient membrane depolarization and levels of intracellular calcium and cAMP. In the intact SCN, cellular oscillations are synchronized and reinforced by rhythmic synaptic input from other cells, resulting in a reproducible topographic pattern of distinct phases and amplitudes specified by SCN circuit organization. The SCN network synchronizes its component cellular oscillators, reinforces their oscillations, responds to light input by altering their phase distribution, increases their robustness to genetic perturbations, and enhances their precision. Thus, even though individual SCN neurons can be cell-autonomous circadian oscillators, neuronal network properties are integral to normal function of the SCN.
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