Calcium signaling via voltage-dependent L-type Ca2+ channels

Calcium signaling via voltage-dependent L-type Ca2+ channels
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通过电压依赖性 L 型 Ca2 通道发出钙信号

DOI:
10.1002/sita.200400035
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发表时间:
2004
期刊:
Signal Transduction
影响因子:
--
通讯作者:
H. Ichijo
H. Ichijo
中科院分区:
--
文献类型:
--
作者:
I. Naguro;S. Adachi;H. Ichijo

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在可兴奋细胞如肌肉和神经元中,电压依赖的l型Ca2+通道是响应细胞膜去极化的Ca2+从细胞外空间内流的最重要途径之一。Ca2+离子通过该通道作为Ca2+信号调节快速(毫秒级时间尺度,如肌肉收缩)和长期(数天或数周时间尺度,如基因表达)细胞反应。许多重要的信号分子通过Ca2+信号被激活,如Ca2+依赖性蛋白酶(calpain)、钙/钙调素依赖性激酶(CaMKs)、磷酸酶(calcineurin)和丝裂原活化蛋白激酶(MAPKs)。它们受时间和空间限制的Ca2+信号激活,因此在原生组织中受到严格调控。多种Ca2+通道参与了细胞内Ca2+浓度的升高。它们不仅仅是Ca2+内流的途径,也是决定应该激活哪个特定信号级联的机制。最近,Ca2+通过l型Ca2+通道内流激活特定信号级联的分子机制已经被阐明。在这篇综述中,我们描述了通过l型Ca2+通道的Ca2+信号的作用,特别是在心肌细胞和神经元中,重点是通过l型Ca2+通道机制激活特定Ca2+信号的机制。
In excitable cells such as muscles and neurons, the voltage-dependent L-type Ca2+ channel is one of the most important pathways for Ca2+ influx from extracellular space in response to the cell membrane depolarization. Ca2+ ion through this channel works as a Ca2+ signal that regulates fast (on time scale of milliseconds; e.g. muscle contraction) and long-term (on a time scale of days or weeks; e.g. gene expression) cellular responses. Many important signal molecules are activated via Ca2+ signal, such as Ca2+-dependent protease (calpain), calcium/calmodulin dependent kinases (CaMKs), phosphatase (calcineurin), and mitogen-activated protein kinases (MAPKs). They are activated by temporally and spatially restricted Ca2+ signals, thus strictly regulated in native tissues. Many kinds of Ca2+ channels are involved in the rise of the intracellular Ca2+ concentration. They are not mere routes of Ca2+ influx but also machineries that decide which specific signal cascade should be activated. Recently, the molecular mechanisms by which Ca2+ influx through L-type Ca2+ channels can activate specific signal cascades have been clarified. In this review, we describe the role of Ca2+ signaling via L-type Ca2+ channels particularly in cardiac myocytes and neurons with emphasis on the mechanisms underlying the activation of the specific Ca2+ signals by the L-type Ca2+ channel machinery.
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