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
中科院分区:
文献类型:
--
作者:
Csordás G;Várnai P;Golenár T;Roy S;Purkins G;Schneider TG;Balla T;Hajnóczky G
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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DOI:
10.1073/pnas.032423699
发表时间:
2002-02-19
影响因子:
11.1
作者:
Pacher, P;Thomas, AP;Hajóczky, G
通讯作者:
Hajóczky, G
影响因子:
11.4
作者:
Csordás, G;Thomas, AP;Hajnóczky, G
通讯作者:
Hajnóczky, G
影响因子:
4.8
作者:
Csordás, G;Hajnóczky, G
通讯作者:
Hajnóczky, G
影响因子:
11.4
作者:
Pacher, P;Hajnóczky, G
通讯作者:
Hajnóczky, G
影响因子:
6
作者:
Mannella, CA;Buttle, K;Marko, M
通讯作者:
Marko, M