A Series of Suppressive Signals within the Drosophila Circadian Neural Circuit Generates Sequential Daily Outputs.

A Series of Suppressive Signals within the Drosophila Circadian Neural Circuit Generates Sequential Daily Outputs.
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DOI:
10.1016/j.neuron.2017.05.007
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发表时间:
2017-06-21
期刊:
影响因子:
16.2
通讯作者:
Taghert PH
Taghert PH
中科院分区:
医学1区
文献类型:
--
作者:
Liang X;Holy TE;Taghert PH

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我们利用活体全脑成像技术研究了果蝇的昼夜节律神经回路。五组主要的起搏器神经元显示同步的分子时钟,但每一组都显示出每日钙激活的不同阶段。光和晨间神经肽(S-LNV)共同使晚间相延迟约12h,单用PDF使DN3相延迟约17h,从S-LNV和LND起搏器释放的神经肽sNPF在DN1组引起晚间钙激活。该电路还具有PDF的负反馈功能,截断S-LNV钙波,终止PDF的释放。PDF和sNPF均通过细胞自主作用抑制持续时间较长的靶起搏器基础钙离子水平。因此,光和神经肽在回路的不同中枢动态作用,产生多个抑制事件,从而产生适当的昼夜起搏器神经元活动的节奏和序列。
We studied the Drosophila circadian neural circuit using whole brain imaging in vivo. Five major groups of pacemaker neurons display synchronized molecular clocks, yet each exhibits a distinct phase of daily Ca2+ activation. Light and neuropeptide PDF from morning cells (s-LNv) together delay the phase of the evening (LNd) group by ~12 h; PDF alone delays the phase of the DN3 group, by ~17 h. Neuropeptide sNPF, released from s-LNv and LNd pacemakers, produces latenight Ca2+ activation in the DN1 group. The circuit also features negative feedback by PDF to truncate the s-LNv Ca2+ wave and terminate PDF release. Both PDF and sNPF suppress basal Ca2+ levels in target pacemakers with long durations by cell autonomous actions. Thus, light and neuropeptides act dynamically at distinct hubs of the circuit to produce multiple suppressive events that create the proper tempo and sequence of circadian pacemaker neuronal activities.
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