Keeping time in the lamina terminalis: Novel oscillator properties of forebrain sensory circumventricular organs

Keeping time in the lamina terminalis: Novel oscillator properties of forebrain sensory circumventricular organs
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在终板中保持时间:前脑感觉室周器官的新颖振荡器特性

DOI:
10.1096/fj.201901111r
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发表时间:
2019
期刊:
The FASEB Journal
影响因子:
--
通讯作者:
Northeast R
Northeast R
中科院分区:
--
文献类型:
--
作者:
Northeast R

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饮酒行为和渗透调节机制表现出明显的日常变化,这是实现内稳态渗透压所必需的。在哺乳动物中,大脑交叉上核团中的主时钟长期以来一直被认为是生理和行为中昼夜节律(24小时)的主要驱动因素。然而,节律性时钟基因在其他大脑部位的表达增加了局部昼夜节律控制神经活动和功能的可能性。穹隆下器(SFO)和终板血管器(OVLT)是中枢控制口渴和水平衡的两个感觉周脑室器官(SCVO),但它们在多大程度上受到内在昼夜节律的控制尚不清楚。利用体外生物发光和体内基因表达的结合,我们首次报道了SFO包含一个出人意料的强大的自主时钟,在核心和非核心时钟基因表达方面具有异常的时空特征。此外,SFO和OVLT中可能的单细胞振荡器具有很强的节律性,需要依赖动作电位的通信来保持同步。我们的结果表明,这些控制口渴的SCVO具有内在的昼夜节律特性,并提高了这些特性有助于日常饮酒行为调节的可能性。
Drinking behavior and osmotic regulatory mechanisms exhibit clear daily variation which is necessary for achieving the homeostatic osmolality. In mammals, the master clock in the brain's suprachiasmatic nuclei has long been held as the main driver of circadian (24 h) rhythms in physiology and behavior. However, rhythmic clock gene expression in other brain sites raises the possibility of local circadian control of neural activity and function. The subfornical organ (SFO) and the organum vasculosum laminae terminalis (OVLT) are two sensory circumventricular organs (sCVOs) that play key roles in the central control of thirst and water homeostasis, but the extent to which they are subject to intrinsic circadian control remains undefined. Using a combination of ex vivo bioluminescence and in vivo gene expression, we report for the first time that the SFO contains an unexpectedly robust autonomous clock with unusual spatiotemporal characteristics in core and noncore clock gene expression. Furthermore, putative single‐cell oscillators in the SFO and OVLT are strongly rhythmic and require action potential‐dependent communication to maintain synchrony. Our results reveal that these thirst‐controlling sCVOs possess intrinsic circadian timekeeping properties and raise the possibility that these contribute to daily regulation of drinking behavior.
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