Abstract
Despite the wide application of super-resolution (SR) microscopy in biological studies of cells, the technology is rarely used to monitor functional changes in live cells. By combining fast spinning disc-confocal structured illumination microscopy (SD-SIM) with loading of cytosolic fluorescent Ca2+ indicators, we have developed an SR method for visualization of regional Ca2+ dynamics and related cellular organelle morphology and dynamics, termed SR calcium lantern imaging. In COS-7 cells stimulated with ATP, we have identified various calcium macrodomains characterized by different types of Ca2+ release from endoplasmic reticulum (ER) stores. Finally, we demonstrated various roles of mitochondria in mediating calcium signals from different sources; while mitochondria can globally potentiate the Ca2+ entry associated with store release, mitochondria also locally control Ca2+ release from the neighboring ER stores and assist in their refilling processes.
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Acknowledgements
This work was supported by the grants from the National Science and Technology Major Project Program (2016YFA0500400), the National Natural Science Foundation of China (81925022, 91854112, 31327901, 31521062, 31570839, 91750203), and Beijing Natural Science Foundation (L172003, 7182063).
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Zhang, Y., Wang, J., Xing, S. et al. Mitochondria determine the sequential propagation of the calcium macrodomains revealed by the super-resolution calcium lantern imaging. Sci. China Life Sci. 63, 1543–1551 (2020). https://doi.org/10.1007/s11427-019-1659-4
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DOI: https://doi.org/10.1007/s11427-019-1659-4