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首页> 外文期刊>Neuron >Rod vision is controlled by dopamine-dependent sensitization of rod bipolar cells by GABA.
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Rod vision is controlled by dopamine-dependent sensitization of rod bipolar cells by GABA.

机译:杆状视力受GABA对杆状双极细胞的多巴胺依赖性致敏作用控制。

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摘要

Dark and light adaptation of retinal neurons allow our vision to operate over an enormous light intensity range. Here we report a mechanism that controls the light sensitivity and operational range of rod-driven bipolar cells that mediate dim-light vision. Our data indicate that the light responses of these cells are enhanced by sustained chloride currents via GABA(C) receptor channels. This sensitizing GABAergic input is controlled by dopamine D1 receptors, with horizontal cells serving as a plausible source of GABA release. Our findings expand the role of dopamine in vision from its well-established function of suppressing rod-driven signals in bright light to enhancing the same signals under dim illumination. They further reveal a role for GABA in sensitizing the circuitry for dim-light vision, thereby complementing GABA's traditional role in providing dynamic feedforward and feedback inhibition in the retina.
机译:视网膜神经元的暗光适应使我们的视觉在巨大的光强度范围内运作。在这里,我们报告了一种机制,该机制控制介导暗光视觉的杆状双极细胞的光敏感性和操作范围。我们的数据表明,通过GABA(C)受体通道持续产生的氯化物电流增强了这些细胞的光反应。这种致敏的GABA能量输入受多巴胺D1受体控制,水平细胞可以作为GABA释放的合理来源。我们的发现扩展了多巴胺在视觉中的作用,从其完善的抑制强光下的杆驱动信号到增强昏暗照明下相同信号的功能。它们进一步揭示了GABA在使昏暗视觉视觉电路敏感的作用,从而补充了GABA在提供动态前馈和视网膜抑制作用方面的传统作用。

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