Dynamic interactions mediated by nonredundant signaling mechanisms couple circadian clock neurons.

Dynamic interactions mediated by nonredundant signaling mechanisms couple circadian clock neurons.
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DOI:
10.1016/j.neuron.2013.08.022
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发表时间:
2013-11-20
期刊:
影响因子:
16.2
通讯作者:
Davidson AJ
Davidson AJ
中科院分区:
医学1区
文献类型:
--
作者:
Evans JA;Leise TL;Castanon-Cervantes O;Davidson AJ

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视交叉上核(SCN)神经元之间的相互作用需要强大的昼夜节律夹带到本地时间。为了研究这些偶联机制,我们开发了一种新型功能偶联测定法,该测定法独特地捕获了SCN神经元相互作用的动态过程。作为一个群体,SCN神经元通常显示出具有相似峰值时间的同步节律,但在体内暴露于长日照后将相隔6- 12小时达到峰值。一旦从这些条件中移除,SCN神经元通过由血管活性肠多肽(VIP)和GABAA信号传导介导的相位依赖性偶联过程来活化。值得注意的是,当SCN网络处于反相配置时,GABAA信号传导有助于耦合,但在稳态条件下反对同步。此外,VIP与GABAA信令一起作用以在反相配置中耦合网络,但是通过抵消GABAA信令的动作来促进稳态条件下的同步。因此,SCN神经元通过受网络状态影响的非冗余耦合机制进行交互。
Interactions among suprachiasmatic nucleus (SCN) neurons are required for robust circadian rhythms entrained to local time. To investigate these coupling mechanisms, we developed a novel functional coupling assay that uniquely captures the dynamic process by which SCN neurons interact. As a population, SCN neurons typically display synchronized rhythms with similar peak times, but will peak 6–12h apart after in vivo exposure to long days. Once removed from these conditions, SCN neurons resynchronize through a phase-dependent coupling process mediated by both vasoactive intestinal polypeptide (VIP) and GABAA signaling. Notably, GABAA signaling contributes to coupling when the SCN network in an anti-phase configuration, but opposes synchrony under steady-state conditions. Further, VIP acts together with GABAA signaling to couple the network in an anti-phase configuration, but promotes synchrony under steady-state conditions by counteracting the actions of GABAA signaling. Thus, SCN neurons interact through non-redundant coupling mechanisms influenced by the state of the network.
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