Linking neural activity and molecular oscillations in the SCN.

Linking neural activity and molecular oscillations in the SCN.
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连接SCN中的神经活动和分子振荡。

DOI:
10.1038/nrn3086
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发表时间:
2011-09-02
影响因子:
34.7
通讯作者:
Colwell, Christopher S.
Colwell, Christopher S.
中科院分区:
医学1区
文献类型:
--
作者:
Colwell, Christopher S.

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视交叉上核 (SCN) 中的神经元作为中央计时回路的一部分发挥作用,驱动我们的行为和基础生理机能的日常变化。 SCN神经元群体的一个标志性特征是,它们在夜间大多处于电沉默状态,在黎明时开始激发动作电位,然后全天继续以缓慢而稳定的速度产生动作电位。电流组是造成这种日常节律的原因,最有力的证据表明持续的 Na+ 电流、L 型 Ca2+ 电流、超极化激活电流 (IH)、大电导 Ca2+ 激活的 K+ (BK) 电流和快速延迟整流 (FDR) K+ 电流。这些电活动节律对于昼夜节律计时系统的功能至关重要,包括时钟基因的表达,并随着衰老和疾病而下降。本文回顾了我们目前对驱动 SCN 节律性放电模式的离子和分子机制的理解。
Neurons in the suprachiasmatic nucleus (SCN) function as part of a central timing circuit that drives daily changes in our behaviour and underlying physiology. A hallmark feature of SCN neuronal populations is that they are mostly electrically silent during the night, start to fire action potentials near dawn and then continue to generate action potentials with a slow and steady pace all day long. Sets of currents are responsible for this daily rhythm, with the strongest evidence for persistent Na+ currents, L-type Ca2+ currents, hyperpolarization-activated currents (IH), large-conductance Ca2+ activated K+ (BK) currents and fast delayed rectifier (FDR) K+ currents. These rhythms in electrical activity are crucial for the function of the circadian timing system, including the expression of clock genes, and decline with ageing and disease. This article reviews our current understanding of the ionic and molecular mechanisms that drive the rhythmic firing patterns in the SCN.
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