Elevated Cytosolic Cl- Concentrations in Dendritic Knobs of Mouse Vomeronasal Sensory Neurons.

Elevated Cytosolic Cl- Concentrations in Dendritic Knobs of Mouse Vomeronasal Sensory Neurons.
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小鼠犁鼻感觉神经元树突状突起中胞质 Cl 浓度升高

DOI:
10.1093/chemse/bjw077
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发表时间:
2016
期刊:
影响因子:
3.5
通讯作者:
Spehr M
Spehr M
中科院分区:
心理学4区
文献类型:
--
作者:
Untiet V;Moeller LM;Ibarra-Soria X;Sánchez-Andrade G;Stricker M;Neuhaus EM;Logan DW;Gensch T;Spehr M

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在啮齿动物中,犁鼻系统控制着社会和性行为。然而,犁鼻器官中感觉信号的几个机械方面仍然不清楚。在这里,我们研究了最近提出的犁鼻信号转导组件-钙激活的CL−电流的生物物理基础。由于这种电流的生理作用是Cl-−平衡电位的直接函数,因此我们测定了犁鼻神经元树突结节内的Cl-−浓度。在完整的犁鼻神经上皮顶端表面的一种对氯−敏感的染料的荧光寿命成像显示,树突结中胞浆中的氯−水平增加,犁鼻支持细胞中的氯−浓度显著降低,犁鼻神经元中沿树突尖基轴方向有明显的氯−梯度。综上所述,我们的研究结果为通过开放钙激活的Cl-−通道,在犁鼻神经元微绒毛中放大感觉信号提供了生物物理基础。
In rodents, the vomeronasal system controls social and sexual behavior. However, several mechanistic aspects of sensory signaling in the vomeronasal organ remain unclear. Here, we investigate the biophysical basis of a recently proposed vomeronasal signal transduction component—a Ca2+-activated Cl−current. As the physiological role of such a current is a direct function of the Cl−equilibrium potential, we determined the intracellular Cl−concentration in dendritic knobs of vomeronasal neurons. Quantitative fluorescence lifetime imaging of a Cl−-sensitive dye at the apical surface of the intact vomeronasal neuroepithelium revealed increased cytosolic Cl−levels in dendritic knobs, a substantially lower Cl−concentration in vomeronasal sustentacular cells, and an apparent Cl−gradient in vomeronasal neurons along their dendritic apicobasal axis. Together, our data provide a biophysical basis for sensory signal amplification in vomeronasal neuron microvilli by opening Ca2+-activated Cl−channels.
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