Adaptation to background light enables contrast coding at rod bipolar cell synapses.

Adaptation to background light enables contrast coding at rod bipolar cell synapses.
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DOI:
10.1016/j.neuron.2013.10.054
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发表时间:
2014-01-22
期刊:
影响因子:
16.2
通讯作者:
Singer JH
Singer JH
中科院分区:
医学1区
文献类型:
--
作者:
Ke JB;Wang YV;Borghuis BG;Cembrowski MS;Riecke H;Kath WL;Demb JB;Singer JH

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杆状感光器在6个对数单位的光强度范围内对视觉有贡献。视杆视觉的大动态范围被认为取决于连接视杆和神经节细胞的两条平行通路之间的光强度依赖的切换:视杆→视杆双极(RB)细胞通路在昏暗背景下工作,以及视杆→视锥→视锥双极细胞通路在较亮背景下操作。我们通过记录神经节和AII无长突细胞的Rb介导的光反应和记录小鼠视网膜AII无长突细胞的Rb介导的突触电流来评估这种传统的视杆视觉模型。与传统模型相反,我们发现Rb通路在足以激活杆→锥体通路的背景下发挥作用。随着背景光强度的增加,RB的作用从编码单个光子的吸收转变为编码平均亮度附近的对比度调制。这种转变可以用Rb突触传递的内在动力学来解释。
Rod photoreceptors contribute to vision over a ~6 log-unit range of light intensities. The wide dynamic range of rod vision is thought to depend upon light intensity-dependent switching between two parallel pathways linking rods to ganglion cells: a rod→rod bipolar (RB) cell pathway that operates at dim backgrounds and a rod→cone→cone bipolar cell pathway that operates at brighter backgrounds. We evaluated this conventional model of rod vision by recording rod-mediated light responses from ganglion and AII amacrine cells and by recording RB-mediated synaptic currents from AII amacrine cells in mouse retina. Contrary to the conventional model, we found that the RB pathway functioned at backgrounds sufficient to activate the rod→cone pathway. As background light intensity increased, the RB’s role changed from encoding the absorption of single photons to encoding contrast modulations around mean luminance. This transition is explained by the intrinsic dynamics of transmission from RB synapses.
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