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Imaging intraorganellar Ca2+ at subcellular resolution using CEPIA

Author

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  • Junji Suzuki

    (Graduate School of Medicine, The University of Tokyo)

  • Kazunori Kanemaru

    (Graduate School of Medicine, The University of Tokyo)

  • Kuniaki Ishii

    (School of Medicine, Yamagata University)

  • Masamichi Ohkura

    (Brain Science Institute, Saitama University)

  • Yohei Okubo

    (Graduate School of Medicine, The University of Tokyo)

  • Masamitsu Iino

    (Graduate School of Medicine, The University of Tokyo)

Abstract

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.

Suggested Citation

  • Junji Suzuki & Kazunori Kanemaru & Kuniaki Ishii & Masamichi Ohkura & Yohei Okubo & Masamitsu Iino, 2014. "Imaging intraorganellar Ca2+ at subcellular resolution using CEPIA," Nature Communications, Nature, vol. 5(1), pages 1-13, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5153
    DOI: 10.1038/ncomms5153
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    1. Iqbal Dulloo & Peace Atakpa-Adaji & Yi-Chun Yeh & Clémence Levet & Sonia Muliyil & Fangfang Lu & Colin W. Taylor & Matthew Freeman, 2022. "iRhom pseudoproteases regulate ER stress-induced cell death through IP3 receptors and BCL-2," Nature Communications, Nature, vol. 13(1), pages 1-18, December.
    2. Su Jin Ham & Heesuk Yoo & Daihn Woo & Da Hyun Lee & Kyu-Sang Park & Jongkyeong Chung, 2023. "PINK1 and Parkin regulate IP3R-mediated ER calcium release," Nature Communications, Nature, vol. 14(1), pages 1-18, December.
    3. Ariel A. Valiente-Gabioud & Inés Garteizgogeascoa Suñer & Agata Idziak & Arne Fabritius & Jérome Basquin & Julie Angibaud & U. Valentin Nägerl & Sumeet Pal Singh & Oliver Griesbeck, 2023. "Fluorescent sensors for imaging of interstitial calcium," Nature Communications, Nature, vol. 14(1), pages 1-15, December.
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    7. Roman Nikolaienko & Elisa Bovo & Daniel Kahn & Ryan Gracia & Thomas Jamrozik & Aleksey V. Zima, 2023. "Cysteines 1078 and 2991 cross-linking plays a critical role in redox regulation of cardiac ryanodine receptor (RyR)," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    8. Takuya Kobayashi & Akihisa Tsutsumi & Nagomi Kurebayashi & Kei Saito & Masami Kodama & Takashi Sakurai & Masahide Kikkawa & Takashi Murayama & Haruo Ogawa, 2022. "Molecular basis for gating of cardiac ryanodine receptor explains the mechanisms for gain- and loss-of function mutations," Nature Communications, Nature, vol. 13(1), pages 1-15, December.
    9. Kihyoun Park & Hyejin Lim & Jinyoung Kim & Yeseong Hwang & Yu Seol Lee & Soo Han Bae & Hyeongseok Kim & Hail Kim & Shin-Wook Kang & Joo Young Kim & Myung-Shik Lee, 2022. "Lysosomal Ca2+-mediated TFEB activation modulates mitophagy and functional adaptation of pancreatic β-cells to metabolic stress," Nature Communications, Nature, vol. 13(1), pages 1-17, December.

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