Imaging intraorganellar Ca2+ at subcellular resolution using CEPIA.

Imaging intraorganellar Ca2+ at subcellular resolution using CEPIA.
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使用CEPIA在亚细胞分辨率下成像仪内CA2+。

DOI:
10.1038/ncomms5153
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发表时间:
2014-06-13
影响因子:
16.6
通讯作者:
Iino, Masamitsu
Iino, Masamitsu
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Suzuki, Junji;Kanemaru, Kazunori;Ishii, Kuniaki;Ohkura, Masamichi;Okubo, Yohei;Iino, Masamitsu

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内质网(ER)和线粒体在其管腔内积累Ca 2+以调节许多细胞功能。然而,确定胞内钙离子的动力学已被证明是困难的。在这里,我们描述了一个家庭的遗传编码的钙离子指示剂,钙测量细胞器截留蛋白质指示剂(CEPIA),可用于细胞器内钙离子成像。发射绿色、红色或蓝色/绿色荧光的CEPIA被工程化以在细胞器内Ca 2+浓度下结合Ca 2+。它们可以靶向不同的细胞器,并可以与其他荧光分子标记物一起使用,扩大了可以同时分析的细胞功能范围。CEPIA的时空分辨率使得有可能在同时测量ER和胞质Ca 2+的同时解决Ca 2+输入到单个线粒体中。我们已经使用这些成像能力来揭示个体线粒体中的差异Ca 2+处理。CEPIA成像是一个有用的新工具,以进一步了解细胞器的功能。 细胞内钙传感器的使用提供了关于细胞中钙信号传导的动力学的重要信息。在这里,Suzuki等人开发了细胞器靶向传感器,以同时测量ER和线粒体中的钙浓度,并揭示了线粒体中钙流量的新见解。
The endoplasmic reticulum (ER) and mitochondria accumulate Ca2+ within their lumens to regulate numerous cell functions. However, determining the dynamics of intraorganellar Ca2+ has proven to be difficult. Here we describe a family of genetically encoded Ca2+ indicators, named calcium-measuring organelle-entrapped protein indicators (CEPIA), which can be utilized for intraorganellar Ca2+ imaging. CEPIA, which emit green, red or blue/green fluorescence, are engineered to bind Ca2+ at intraorganellar Ca2+ concentrations. They can be targeted to different organelles and may be used alongside other fluorescent molecular markers, expanding the range of cell functions that can be simultaneously analysed. The spatiotemporal resolution of CEPIA makes it possible to resolve Ca2+ import into individual mitochondria while simultaneously measuring ER and cytosolic Ca2+. We have used these imaging capabilities to reveal differential Ca2+ handling in individual mitochondria. CEPIA imaging is a useful new tool to further the understanding of organellar functions. The use of intracellular calcium sensors provides important information about the dynamics of calcium signalling in cells. Here Suzuki et al. develop organelle-targeted sensors to simultaneously measure calcium concentrations in ER and mitochondria, and uncover novel insights into calcium flux in mitochondria.
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