Phototransduction in vertebrate rods.
Phototransduction in vertebrate rods.
复制标题
脊椎动物视杆细胞中的光转导。
DOI:
10.1146/annurev.ne.08.030185.002011
复制
发表时间:
1985
影响因子:
13.9
通讯作者:
E. A. Schwartz
中科院分区:
文献类型:
--
作者:
E. A. Schwartz
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.
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
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
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