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首页> 外文期刊>Neuron >Entrainment of Circadian Rhythms Depends on Firing Rates and Neuropeptide Release of VIP SCN Neurons
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Entrainment of Circadian Rhythms Depends on Firing Rates and Neuropeptide Release of VIP SCN Neurons

机译:昼夜节律的夹带取决于探测SCN神经元的射击率和神经肽释放

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摘要

The mammalian suprachiasmatic nucleus (SCN) functions as a master circadian pacemaker, integrating environmental input to align physiological and behavioral rhythms to local time cues. Approximately 10% of SCN neurons express vasoactive intestinal polypeptide (VIP); however, it is unknown how firing activity of VIP neurons releases VIP to entrain circadian rhythms. To identify physiologically relevant firing patterns, we optically tagged VIP neurons and characterized spontaneous firing over 3?days. VIP neurons had circadian rhythms in firing rate and exhibited two classes of instantaneous firing activity. We next tested whether physiologically relevant firing affected circadian rhythms through VIP release. We found that VIP neuron stimulation with high, but not low, frequencies shifted gene expression rhythmsin?vitrothrough VIP signaling.In?vivo, high-frequency VIP neuron activation rapidly entrained circadian locomotor rhythms. Thus, increases in VIP neuronal firing frequency release VIP and entrain molecular and behavioral circadian rhythms. Video AbstractDisplay Omitted.
机译:哺乳动物的哺乳动物的核心核(SCN)用作主昼夜昼夜昼夜节目起搏器,整合环境输入以将生理和行为节律与当地时间提示一致。大约10%的SCN神经元表达血管活性肠道多肽(VIP);然而,尚不清楚VIP神经元的射击活动如何发布VIP以纳入昼夜节律。为了鉴定生理相关的烧制模式,我们光学标记了VIP神经元并以3个天的自发射击。 VIP神经元在射击率上有昼夜节律,并展示了两类瞬间射击活动。我们接下来通过VIP释放测试了是否会对生理相关的射击影响昼夜节律影响。我们发现VIP神经元刺激高,但不低,频率偏移基因表达节奏?VITROCHROUCH VIP信号。在高频VIP神经元激活快速夹带昼夜活动节奏。因此,VIP神经元烧制频率释放VIP的增加和夹带分子和行为昼夜节律。 Video AbstractDisplay省略。

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