Phototransduction in vertebrate rods.

Phototransduction in vertebrate rods.
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脊椎动物视杆细胞中的光转导。

DOI:
10.1146/annurev.ne.08.030185.002011
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发表时间:
1985
影响因子:
13.9
通讯作者:
E. A. Schwartz
E. A. Schwartz
中科院分区:
医学1区
文献类型:
--
作者:
E. A. Schwartz

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杆状细胞精心制作了一种特殊的细胞器,将光转化为电信号。它们的外节含有一长叠扁平的囊或盘,被质膜覆盖。视紫红质分子包埋在盘膜中;质膜内有通道,允许Na离子在黑暗中进入。视紫红质对光的吸收引发了一系列穿过细胞质并停止质膜电流的事件。最近的研究揭示了光引发的第一个生物化学步骤,质膜电流的特性,以及关于早期步骤如何与随后的膜通道关闭相联系的诱人信息。雅阁,我把这篇评论分为四个部分:(a)plas-martemalemmal电流的属性,(B)光产生的早期事件,(c)限制光如何控制电流的观察,(d)推测性的综合。Ca和cGMp·都被认为在转导中具有重要作用。在一种方案中,Ca储存在盘内,并通过光释放以扩散穿过细胞质空间并阻断通道(Hagins 1972)。在另一个方案中,cGMP保持通道开放,并且光激活磷酸二酯酶,其降低cGMP浓度(参见Hubbell & Bownds的综述,1979)。这两种观点主导了转导领域。在讨论的每一部分都可以看到他们的影子。
Rods elaborate a special organelle for converting light into an electrical signal. Their outer segment contains a long stack of flattened sacs, or discs, covered by the plasmalemma. Embedded in the disc membrane are rhodopsin mole­ cules; within the plasmalemma are channels that allow the entry of Na ions during darkness. The absorption of light by rhodopsin initiates a series of events that cross the cytoplasm and stop the plasmalemmal current. Recent studies have revealed the first biochemical steps initiated by light, properties of the plasmalemmal current, and tantalizing bits concerning how the early steps are connected to the subsequent closure of membrane channels. Accord­ ingly, I have divided this review into four parts: (a) properties of the plas­ malemmal current, (b) the early events produced by light, (c) observations that place restrictions on how light controls the current, and (d) a speculative synthesis. Both Ca and cGMp· have been suggested to have an important role in transduction. In one scheme, Ca is stored within discs and is released by light to diffuse across the cytoplasmic space and to block channels (Hagins 1972). In another scheme, cGMP keeps channels open and light activates a phospho­ diesterase that reduces cGMP concentration (see review by Hubbell & Bownds 1979). These two ideas dominate the transduction landscape. Their shadow is seen in every part of the discussion.
控制虎钝口螈视网膜孤杆中的发电机电流。
DOI: 10.1113/jphysiol.1984.sp015131
发表时间: 1984
期刊: The Journal of physiology
影响因子: --
作者:
MacLeish,PR;Schwartz,EA;Tachibana,M
通讯作者: Tachibana,M
通过 18O 掺入核苷酸 α-磷酰基确定的视网膜 cGMP 代谢通量增加的幅度与光刺激的强度相对应。
DOI: --
发表时间: 1983
期刊: The Journal of biological chemistry
影响因子: --
作者:
Goldberg,ND;Ames3rd,AA;Gander,JE;Walseth,TF
通讯作者: Walseth,TF
蟾蜍离体视网膜中视杆细胞之间的相互作用。
DOI: 10.1113/jphysiol.1981.sp013704
发表时间: 1981
期刊: The Journal of physiology
影响因子: --
作者:
Griff,ER;Pinto,LH
通讯作者: Pinto,LH