Amacrine cells differentially balance zebrafish color circuits in the central and peripheral retina.

Amacrine cells differentially balance zebrafish color circuits in the central and peripheral retina.
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无长突细胞差异性地平衡斑马鱼中央和周边视网膜的颜色回路。

DOI:
10.1016/j.celrep.2023.112055
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发表时间:
2023
期刊:
影响因子:
8.8
通讯作者:
Wang X
Wang X
中科院分区:
生物学1区
文献类型:
--
作者:
Wang X

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脊椎动物的内部视网膜是由光感受器驱动的,光感受器的输出已经经过了预处理;斑马鱼的视网膜外部回路在四种锥状光感受器类型中将“颜色”从“灰度”信息中分离出来。目前还不清楚视网膜内部如何处理传入的光谱信息,同时也结合视锥信号来塑造灰度函数。我们通过成像斑马鱼幼体的无长突细胞(ACS)和双极细胞(BCS)在存在和药物上不存在视网膜内部抑制时的光驱动反应来解决这个问题。我们发现,ACS增强了一些双极细胞中的对抗性,同时抑制了另一些细胞中先前存在的对抗性,因此,根据视网膜区域的不同,颜色对抗单位的数量的净变化基本上为零。为了实现这种“动态平衡”,ACS通过ON通道抵消BCS固有的颜色对抗性。与这些观察结果一致的是,非分层的ACS完全是无色的,而所有有色人种的ACS都在ON亚板分层。
The vertebrate inner retina is driven by photoreceptors whose outputs are already pre-processed; in zebrafish, outer retinal circuits split "color" from "grayscale" information across four cone-photoreceptor types. It remains unclear how the inner retina processes incoming spectral information while also combining cone signals to shape grayscale functions. We address this question by imaging the light-driven responses of amacrine cells (ACs) and bipolar cells (BCs) in larval zebrafish in the presence and pharmacological absence of inner retinal inhibition. We find that ACs enhance opponency in some bipolar cells while at the same time suppressing pre-existing opponency in others, so that, depending on the retinal region, the net change in the number of color-opponent units is essentially zero. To achieve this "dynamic balance," ACs counteract intrinsic color opponency of BCs via the On channel. Consistent with these observations, Off-stratifying ACs are exclusively achromatic, while all color-opponent ACs stratify in the On sublamina.
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