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首页> 外文期刊>Trends in Neurosciences >Intracellular Ca2+ microdomain-triggered exocytosis in neuroendocrine cells.
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Intracellular Ca2+ microdomain-triggered exocytosis in neuroendocrine cells.

机译:神经内分泌细胞中细胞内Ca2 +微区触发的胞吐作用。

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摘要

Colocalization of voltage-gated Ca2+ channels and exocytotic sites at the active zones of nerve terminals underlies 'synchronous' action potential discharge and synaptic vesicle exocytosis, thus allowing fast interneuronal signalling. Such a demand for a rapid release is not expected in neuroendocrine cells whose secretory products act throughout the entire organism. Nevertheless, by using evanescent field imaging of near-membrane Ca2+ concentrations and fluorescently labelled vesicles, Becherer et al. have recently reported exocytosis of individual large dense-core vesicles triggered by Ca2+ microdomains formed around clusters of open L-type Ca2+ channels in chromaffin cells from the adrenal medulla. This finding, besides illustrating the power of new microscopy imaging techniques, directly demonstrates in neuroendocrine cells a functional interaction between Ca2+ channels and secretory vesicles very much reminiscent of that in neurons.
机译:电压门控的Ca2 +通道和神经末梢活性区的胞吐位点的共定位是“同步”动作电位放电和突触小泡胞吐作用的基础,因此可以实现快速的神经内信号传递。在分泌产物作用于整个生物体的神经内分泌细胞中,对这种快速释放的需求是不可预期的。然而,通过使用近膜Ca2 +浓度和荧光标记的囊泡的渐逝场成像,Becherer等人。最近报道了由肾上腺髓质的嗜铬细胞中的开放L型Ca2 +通道簇周围形成的Ca2 +微结构域触发的单个大密集核囊泡的胞吐作用。这一发现,除了说明新的显微成像技术的力量外,还直接在神经内分泌细胞中证明了Ca2 +通道与分泌小泡之间的功能相互作用,非常类似于神经元。

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