PDF receptor expression reveals direct interactions between circadian oscillators in Drosophila.

PDF receptor expression reveals direct interactions between circadian oscillators in Drosophila.
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DOI:
10.1002/cne.22311
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发表时间:
2010-06-01
期刊:
The Journal of comparative neurology
影响因子:
--
通讯作者:
Taghert PH
Taghert PH
中科院分区:
其他
文献类型:
--
作者:
Im SH;Taghert PH

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日常行为节律由昼夜节律起搏的神经元电路控制。在果蝇体内,150个起搏器参与了这个网络,最近的观察表明,这个网络可分为M和E振荡器,这两个振荡器通常相互作用和同步。16个振荡器神经元(小的和大的LNV)表达一种称为色素分散因子(PDF)的神经肽,其信号通常被等同于M振荡器的输出。鉴于PDF信号在行为和分子节律的许多方面的重要性,准确地确定通过PDF受体(PDFR)发生信号的地点和方式现在是该领域的一个中心问题。在这里,我们表明GAL4介导的利用UAS-PDFR转基因对pdfr表型的拯救不足以提供完全的行为拯救。相反,我们描述了一个~70kB的PDF受体(Pdfr)转基因,它确实挽救了整个pdfr昼夜节律行为表型。转基因在心脏起搏器和少数非心脏起搏器中广泛表达,但也存在异质性。我们的结果支持一个重要的假设:小的LNV细胞直接靶向其他关键起搏神经元细胞的子集。此外,转基因的表达证实了PDF通过自分泌反馈信号返回到表达PDF的细胞。最后,结果提出了一个意想不到的PDF受体位置:大的LNV细胞似乎以位于眼底的一群非神经细胞为目标。
Daily rhythms of behavior are controlled by a circuit of circadian pacemaking neurons. In Drosophila, 150 pacemakers participate in this network, and recent observations suggest the network is divisible into M and E oscillators which normally interact and synchronize. Sixteen oscillator neurons (the small and large LNvs) express a neuropeptide called pigment dispersing factor (PDF) whose signaling is often equated with M oscillator output. Given the significance of PDF signaling to numerous aspects of behavioral and molecular rhythms, determining precisely where and how signaling via the PDF receptor (PDFR) occurs is now a central question in the field. Here we show that GAL4-mediated rescue of pdfr phenotypes using a UAS-PDFR transgene is insufficient to provide complete behavioral rescue. In contrast, we describe a ~70 kB PDF receptor (pdfr) transgene which does rescue the entire pdfr circadian behavioral phenotype. The transgene is widely but heterogeneously expressed among pacemakers, and also among a limited number of non-pacemakers. Our results support an important hypothesis: the small LNv cells directly target a subset of the other crucial pacemaker neurons cells. Furthermore, expression of the transgene confirms an autocrine feedback signaling by PDF back to PDF-expressing cells. Finally, the results present an unexpected PDF receptor site: the large LNv cells appear to target a population of non-neuronal cells that resides at the base of the eye.
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