The evolution of organellar calcium mapping technologies.

Matthew Zajac, Souvik Modi, Yamuna Krishnan

Journal: Cell calcium 2022;108():102658

PMID: 36274564

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Abstract

Intracellular Ca fluxes are dynamically controlled by the co-involvement of multiple organellar pools of stored Ca. Endolysosomes are emerging as physiologically critical, yet underexplored, sources and sinks of intracellular Ca. Delineating the role of organelles in Ca signaling has relied on chemical fluorescent probes and electrophysiological strategies. However, the acidic endolysosomal environment presents unique issues, which preclude the use of traditional chemical reporter strategies to map lumenal Ca. Here, we broadly address the current state of knowledge about organellar Ca pools. We then outline the application of traditional probes, and their sensing paradigms. We then discuss how a new generation of probes overcomes the limitations of traditional Caprobes, emphasizing their ability to offer critical insights into endolysosomal Ca, and its feedback with other organellar pools.

Address: Department of Chemistry, The University of Chicago, Chicago, Illinois, 60637, USA; Neuroscience Institute, The University of Chicago, Chicago, IL, 60637, USA.; Esya Labs, Translation and Innovation Hub, Imperial College White City Campus, 84 Wood Lane, London, W12 0BZ, UK.; Department of Chemistry, The University of Chicago, Chicago, Illinois, 60637, USA; Neuroscience Institute, The University of Chicago, Chicago, IL, 60637, USA; Institute for Biophysical Dynamics, The University of Chicago, Chicago, Illinois, 60637, USA. Electronic address: [email protected].

DOI: 10.1016/j.ceca.2022.102658

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MeSH Terms: Calcium, Lysosomes, Endosomes, Fluorescent Dyes, Signal Transduction, Calcium Signaling