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arXiv 2401.04400q-bio.NC
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内层视网膜网络如何塑造神经节细胞感受野:一项计算研究

How does the inner retinal network shape the ganglion cells receptive field : a computational study

Evgenia Kartsaki, Gerrit Hilgen, Evelyne Sernagor, Bruno Cessac

AI总结:

本研究构建内层视网膜连接模型,推导出考虑无长突细胞抑制的RGC时空响应解析公式,揭示双极与无长突细胞相互作用强度及特征时间尺度对RGC响应的综合影响,并通过重现DREADDs药物遗传学实验结果验证模型,为视网膜动力学提供新见解。

摘要:

我们考虑了一个基本的内层视网膜连接模型,其中双极细胞和无长突细胞相互连接,且这两种细胞类型均投射至神经节细胞,调节其向大脑视觉区域的响应输出。我们推导出了一个关于视网膜神经节细胞对刺激的时空响应的解析公式,并考虑了无长突细胞抑制的作用。该分析揭示了网络的两个重要功能参数:(i) 双极细胞与无长突细胞之间相互作用的强度,以及 (ii) 这些响应的特征时间尺度。这两个参数对 RGC 对光响应的时空特征具有深远的综合影响。模型的准确性通过忠实重现药物遗传学实验结果得到了证实,这些结果是通过刺激表达在神经节细胞和无长突细胞亚类上的兴奋性 DREADDs(Designer Receptors Exclusively Activated by Designer Drugs,仅由设计药物激活的设计受体)获得的,从而以一种复杂、纠缠的方式改变了内层视网膜网络对视觉刺激的活动。我们的数学模型使我们能够以实验上不可行的方式探索和破译这些复杂效应,并为视网膜动力学提供了新见解。

英文摘要:

We consider a model of basic inner retinal connectivity where bipolar and amacrine cells interconnect, and both cell types project onto ganglion cells, modulating their response output to the brain visual areas. We derive an analytical formula for the spatio-temporal response of retinal ganglion cells to stimuli taking into account the effects of amacrine cells inhibition. This analysis reveals two important functional parameters of the network: (i) the intensity of the interactions between bipolar and amacrine cells, and, (ii) the characteristic time scale of these responses. Both parameters have a profound combined impact on the spatiotemporal features of RGC responses to light. %We show that, depending on these parameters value, retinal ganglion cells can change their spatio-temporal response (e.g. from monophasic to biphasic). The validity of the model is confirmed by faithfully reproducing pharmacogenetic experimental results obtained by stimulating excitatory DREADDs (Designer Receptors Exclusively Activated by Designer Drugs) expressed on ganglion cells and amacrine cells subclasses, thereby modifying the inner retinal network activity to visual stimuli in a complex, entangled manner. Our mathematical model allows us to explore and decipher these complex effects in a manner that would not be feasible experimentally and provides novel insights in retinal dynamics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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