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Physiological Characteristics of Photoreceptors in the Lamprey, Lethenteron japonicum

机译：Lamprepy，Lethenteron japonicum的感光体的生理特征

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摘要

Lampreys are among the most basal vertebrates, and similar to jawed vertebrates, they have two types of photoreceptors: long photoreceptors (LP; putative cones) and short photoreceptors (SP; putative rods). It is intriguing to examine the physiological properties of vision in these animals. Although there is an accumulating body of histological and biochemical studies of photoreceptors of the lamprey Lethenteron japonicum, many physiological characteristics of this species have not been described. In the present study, single-cell recordings of photoreceptors in the upstream migrant lamprey were performed to investigate the physiological properties of SP and LP of the lamprey Lethenteron japonicum. It was found that the sensitivity in LP at 560 nm was 2000 photons mu m(-2), whereas that in SP at 520 nm was 67 photons mu m(-2), which is approximately a 30-fold difference. Moreover, the response kinetics of LP was remarkably faster than those of SP, which is consistent with previous studies of other Northern hemisphere lampreys. Unexpectedly, the amplitude of single-photon response in the lamprey SP was approximately 0.12 pA, less than 1% of the circulating current. The small amplitude in lamprey SP may degrade the ability to detect single photons of this species. The spectral sensitivity analysis revealed that approximately 30% of all the chromophores are composed of A2 retinal, which may account for the relatively low amplitude of single-photon response in SP.
机译：Lampreys是最基本的脊椎动物之一，并且类似于Jawed脊椎动物，它们具有两种类型的光感受器：长感光体（LP;推定锥体）和短感受器（SP;推定杆）。诱使这些动物中视觉的生理特性有趣。虽然存在对Lamprepteroneron japonicum的光感受器的组织学和生物化学研究的积累体，但尚未描述这种物种的许多生理特性。在本研究中，进行上游移民菌落中的光感受器的单细胞记录，以研究LamprepteLeron japonicum的Sp和Lp的生理特性。结果发现，560nm的LP中的敏感性是2000光子mu m（-2），而在520nm处的Sp中为67光子mu m（-2），其差异约为30倍。此外，LP的响应动力学比SP的响应动力学显着，这与以往的其他北半球Lampreys的研究一致。出乎意料地，Lamprepy SP中的单光子响应的幅度约为0.12Pa，小于循环电流的1％。 Lamprepy Sp中的小幅度可能降低检测该物种的单个光子的能力。光谱灵敏度分析显示，所有发色团的大约30％由A2视网膜组成，这可能考虑SP中的单光子响应的相对低幅度。

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