摘要
感知外界环境并做出响应是生物体的基本特征,而感光是多数生物最重要的感知觉之一.生命体为此特化出了复杂的感光机制,不仅用于形成图像视觉,也帮助生物根据光环境调节相应的生理功能,如瞳孔光反射和生物节律的光授时.这些感光功能统称为非成像视觉功能,主要由一类新近发现的自感光视网膜神经节细胞所介导.自感光视网膜神经节细胞有别于传统的视锥视杆细胞,自发现以来,逐渐积累的研究证实了这类神经元投射到丰富的皮层下结构,并参与包括睡眠节律和情绪调节等多种生理功能.本文旨在回顾有关自感光视网膜神经节细胞光信号转导与皮层下环路的重要发现和最新进展,并针对领域的趋势和待解决问题进行展望.
Perception of light not only results in image vision,but also modulates a number of biological functions that do not involve image formation,such as pupil light reflex and photoentrainment of circadian rhythm.Such non-image-forming vision is primarily mediated by a subset of retinal ganglion cells,termed as intrinsically photosensitive retinal ganglion cells(ipRGCs),which express the photopigment melanopsin thereby exhibiting intrinsic photosensitivity.Since the groundbreaking discovery of ipRGCs approximately two decades ago,ample evidence suggests that ipRGCs project to various subcortical nuclei,and probably participate in a wider range of physiological processes than initially known.This article reviews important laboratory and clinical evidence and recent progress regarding phototransduction of ipRGCs and brain circuitry in non-image vision.
引文
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