Imaging interorganelle contacts and local calcium dynamics at the ER-mitochondrial interface.

Imaging interorganelle contacts and local calcium dynamics at the ER-mitochondrial interface.
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DOI:
10.1016/j.molcel.2010.06.029
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发表时间:
2010-07-09
期刊:
影响因子:
16
通讯作者:
Hajnóczky G
Hajnóczky G
中科院分区:
生物学1区
文献类型:
--
作者:
Csordás G;Várnai P;Golenár T;Roy S;Purkins G;Schneider TG;Balla T;Hajnóczky G

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内质网-线粒体连接提供了一个局部钙信号结构域,该结构域对能量生产与需求匹配以及细胞凋亡的控制都是至关重要的。在这里,我们可视化内质网-线粒体接触部位,并使用药物诱导的荧光细胞器间连接物监测局部的[Ca~(2+)]变化([Ca~(2+)]ER-MT)。我们发现所有的线粒体都与内质网有接触,但质膜-线粒体的接触较少,因为在RBL-2H3和H9c2细胞中都有ER堆叠的交错排列。单个线粒体显示内质网接触的离散斑块,并在内质网-线粒体钙离子转移中表现出异质性。Pericam标记的连接子显示IP3诱导的[Ca~(2+)]ER-mT信号超过9μM,并承受缓冲的胞浆[Ca~(2+)]升高。改变连接子长度以改变可用于钙离子转移机制的空间对[钙]ER-MT信号具有双相效应。这些研究为内质网和线粒体之间存在高钙微域提供了直接证据,并提出了有效转移钙离子的最佳间隙宽度。
The ER-mitochondrial junction provides a local calcium signaling domain that is critical for both matching energy production with demand and the control of apoptosis. Here, we visualize ER-mitochondrial contact sites and monitor the localized [Ca2+] changes ([Ca2+]ER-mt) using drug-inducible fluorescent interorganelle linkers. We show that all mitochondria have contacts with the ER but plasma membrane-mitochondrial contacts are less frequent because of interleaving ER stacks in both RBL-2H3 and H9c2 cells. Single mitochondria display discrete patches of ER contacts and show heterogeneity in the ER-mitochondrial Ca2+ transfer. Pericam-tagged linkers revealed IP3-induced [Ca2+]ER-mt signals that exceeded 9μM and endured buffering bulk cytoplasmic [Ca2+] increases. Altering linker length to modify the space available for the Ca2+ transfer machinery had a biphasic effect on [Ca2+]ER-mt signals. These studies provide direct evidence for the existence of high Ca2+ microdomains between the ER and mitochondria, and suggest an optimal gap width for efficient Ca2+ transfer.
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影响因子: 11.1
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