Recruitment of the intracellular Ca2+ by ultrashort electric stimuli: the impact of pulse duration.

Recruitment of the intracellular Ca2+ by ultrashort electric stimuli: the impact of pulse duration.
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DOI:
10.1016/j.ceca.2013.05.008
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发表时间:
2013-09
期刊:
影响因子:
4
通讯作者:
Pakhomov AG
Pakhomov AG
中科院分区:
生物学2区
文献类型:
--
作者:
Semenov I;Xiao S;Pakhomova ON;Pakhomov AG

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纳秒持续时间的电刺激的区别在于透化细胞内膜和从细胞内储存募集Ca 2+的能力。我们使用Fura-2的比率Ca 2+成像在非兴奋细胞(CHO)中定量这种效应。在无钙培养基中,10-,60-,和300-ns的刺激诱发的Ca 2+瞬时动员的Ca 2+从内质网。与2 mM的外部Ca 2+,瞬态包括额外的和细胞内的组件。细胞内Ca ~(2+)的募集随刺激时间的缩短而增加。在200-300 nM的阈值下,瞬态被钙诱导的钙释放放大。我们得出结论,纳秒刺激模仿钙信号,同时绕过通常的受体和通道介导的级联反应。细胞内Ca 2+的募集可以通过刺激的持续时间来控制。
Nanosecond-duration electric stimuli are distinguished by the ability to permeabilize intracellular membranes and recruit Ca2+ from intracellular stores. We quantified this effect in non-excitable cells (CHO) using ratiometric Ca2+ imaging with Fura-2. In a Ca2+-free medium, 10-, 60-, and 300-ns stimuli evoked Ca2+ transients by mobilization of Ca2+ from the endoplasmic reticulum. With 2 mM external Ca2+, the transients included both extra- and intracellular components. The recruitment of intracellular Ca2+ increased as the stimulus duration decreased. At the threshold of 200–300 nM, the transients were amplified by calcium-induced calcium release. We conclude that nanosecond stimuli mimic Ca2+ signaling while bypassing the usual receptor- and channels-mediated cascades. The recruitment of the intracellular Ca2+ can be controlled by the duration of the stimulus.
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