Synchronized Ca2+ signaling by intercellular propagation of Ca2+ action potentials in NRK fibroblasts.

Synchronized Ca2+ signaling by intercellular propagation of Ca2+ action potentials in NRK fibroblasts.
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NRK 成纤维细胞中 Ca2 动作电位的细胞间传播同步 Ca2 信号传导。

DOI:
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发表时间:
1997
期刊:
American Journal of Physiology - Cell Physiology
影响因子:
--
通讯作者:
A. Theuvenet
A. Theuvenet
中科院分区:
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文献类型:
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作者:
A. D. D. De Roos;Peter H G M Willems;Everardus J.J. van Zoelen;A. Theuvenet

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通过肌醇三磷酸的扩散Ca2+波的细胞间传播已被证明是不可兴奋细胞交流的一般机制。在这里,我们发现正常大鼠肾(NRK)成纤维细胞的单层表现像典型的可兴奋组织。在这些细胞的融合单层中,Ca2+动作电位可以通过缓激肽或细胞外K+浓度升高处理的单层局部去极化产生。这些电张力传播的动作电位以全或无的方式以约6.1 mm/s的速度在细胞间长距离传播,并且可以被l型Ca2+通道阻滞剂阻断。动作电位是由超过阈值的去极化产生的l型Ca2+通道约为-15 mV。这些局部诱导的繁殖Ca2+动作电位的结果是在大量细胞中几乎同步的,短暂的细胞内Ca2+浓度增加。这些数据表明,电偶联成纤维细胞可以形成可兴奋的合胞体,并阐明了细胞间Ca2+信号传导的新机制,该机制可能协调对局部刺激的同步多细胞反应。
The intercellular propagation of Ca2+waves by diffusion of inositol trisphosphate has been shown to be a general mechanism by which nonexcitable cells communicate. Here, we show that monolayers of normal rat kidney (NRK) fibroblasts behave like a typical excitable tissue. In confluent monolayers of these cells, Ca2+ action potentials can be generated by local depolarization of the monolayer on treatment with either bradykinin or an elevation of the extracellular K+ concentration. These electrotonically propagating action potentials travel intercellularly over long distances in an all-or-none fashion at a speed of ∼6.1 mm/s and can be blocked by L-type Ca2+ channel blockers. The action potentials are generated by depolarizations beyond the threshold value for L-type Ca2+ channels of about -15 mV. The result of these locally induced, propagating Ca2+ action potentials is an almost synchronous, transient increase in the intracellular Ca2+ concentration in large numbers of cells. These data show that electrically coupled fibroblasts can form an excitable syncytium, and they elucidate a novel mechanism of intercellular Ca2+ signaling in these cells that may coordinate synchronized multicellular responses to local stimuli.
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