Are dihydropyridine binding sites voltage sensitive calcium channels?
Are dihydropyridine binding sites voltage sensitive calcium channels?
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二氢吡啶结合位点是电压敏感的钙通道吗?
DOI:
10.1016/0024-3205(84)90543-5
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发表时间:
1984
期刊:
影响因子:
6.1
通讯作者:
Freedman,SB
中科院分区:
文献类型:
--
作者:
Miller,RJ;Freedman,SB
It is widely accepted that Ca+ 2 is an extremely importan~ intracellular i,== intracellular messenger. Normally, th~.... Ca+ L concentration is extremely low (~ i0-~ M). The extracellular calcium concentration is about four orders of magnitude higher (reviewed in i). This large concentration difference is the result of several processes. These include the ability~ f several intracellular organelles and proteins to sequester Ca+ L, the presence of various pumps that remove Ca+ 2 from the cell interior against its electrochemical gradient~ and the low permeability of the cell plasma membrane to Ca+~. One way in which the intracellular Ca+ L concentration can be rapidly increased is by opening selective permeability pathways for calcium in the cell membrane. A major way of regulating such calcium channels is by altering the membrane potential (2, 3). Thus, in many cells, membrane depolarization causes the opening÷~ n of calcium channels which allow the r~ pid entry of Ca dow its electrochemical gradient. This Ca+~ can now initiate various processes. I~ neurones, some endocrine cells, smooth and cardiac muscle, Ca+ L entry can contribute significantly to the cell action potential(2). Calcium entry in such cells is an essential link in the processes of stimulus/secretion and stimulus/contraction coupling. Moreover, the calcium current itself and the various effects of Ca+ L on the ionic permeability of the cell membrane is important in the regulation of cell excitability (2-5).In the last decade, a group of drugs of diverse chemical structure has been developed which have the property of being able to block voltage dependent calcium channels (VSCC), at least in some tissues (1, 6). These observations have proved to have great therapeutic importance and these drugs are already widely used for the treatment of angina and hypertension. Interestingly, the VSCC in different tissues do not necessarily have the same sensitivity to channel blockers (1, 6). This again has therapeutic implications. For example, the drugs can be used to treat hypertension and coronary vasospasm without suppressing neurotransmission or inhibiting cardiac function. The molecular implications of these observations will be discussed in this article.
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DOI:
--
发表时间:
1983
期刊:
Journal of Physiology
影响因子:
--
作者:
Y. Ohizumi;T. Yasumoto
通讯作者:
T. Yasumoto
DOI:
--
发表时间:
1983
期刊:
The Journal of pharmacology and experimental therapeutics
影响因子:
--
作者:
Hojvat,SA;Musch,MW;Miller,RJ
通讯作者:
Miller,RJ
影响因子:
6.1
作者:
Alan S. Fairhurst;Stanley A. Thayer;Jack E. Colker;David A. Beatty
通讯作者:
David A. Beatty
DOI:
--
发表时间:
1982
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Hartshorne,RP;Messner,DJ;Coppersmith,JC;Catterall,WA
通讯作者:
Catterall,WA
影响因子:
5.5
作者:
FAIN, GL;GERSCHENFELD, HM;QUANDT, FN
通讯作者:
QUANDT, FN