Major role of dihydropyridine-sensitive Ca2+ channels in Ca(2+)-induced calcitonin secretion.
Major role of dihydropyridine-sensitive Ca2+ channels in Ca(2+)-induced calcitonin secretion.
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二氢吡啶敏感的 Ca2+ 通道在 Ca(2+) 诱导的降钙素分泌中的主要作用。
DOI:
--
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发表时间:
1993
影响因子:
--
通讯作者:
J. Hescheler
中科院分区:
文献类型:
--
作者:
H. Scherübl;T. Kleppisch;A. Zink;F. Raue;D. Krautwurst;J. Hescheler
Endocrine cells are known to possess multiple types of Ca2+ channels. In neurons, omega-conotoxin-sensitive N-type Ca2+ channels have been shown to play a dominant role in neurotransmitter release, but uncertainty remains about the types of Ca2+ channels involved in stimulus-secretion coupling in endocrine cells. We investigated the relative contribution of 1,4-dihydropyridine-sensitive and omega-conotoxin-sensitive Ca2+ channels to Ca(2+)-induced calcitonin release in parafollicular cells of the thyroid (C cells). In whole cell voltage-clamp experiments, both 1,4-dihydropyridine-sensitive and omega-conotoxin-sensitive Ca2+ channel currents were identified. The dihydropyridine isradipine (1 microM) but not omega-conotoxin (1 microM) inhibited the steady-state Ca2+ influx at physiological membrane potentials, the spontaneous electrical activity, and calcitonin secretion (at 2-h incubations). Moreover, suppression of the spontaneous electrical activity by the Na+ channel blocker tetrodotoxin did not affect calcitonin release. We conclude that 1,4-dihydropyridine-sensitive Ca2+ channels play a major role in Ca(2+)-dependent calcitonin release and that calcitonin secretion due to Ca2+ influx proceeds even in the absence of action potentials.
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影响因子:
3.9
作者:
Muff,R;Nemeth,EF;Haller-Brem,S;Fischer,JA
通讯作者:
Fischer,JA
影响因子:
4.8
作者:
Nemeth,EF;Taraskevich,PS;Douglas,WW
通讯作者:
Douglas,WW
DOI:
--
发表时间:
1986
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Fried,RM;TashjianJr,AH
通讯作者:
TashjianJr,AH
影响因子:
4.8
作者:
Ramsdell,JS;TashjianJr,AH
通讯作者:
TashjianJr,AH