Abstract
Mitochondria efficiently buffer Ca2+ influx during excitation, which limits the amplitude of cytosolic Ca2+ rise, and then slowly release Ca2+ back into the cytosol thereby extending the duration of cytosolic Ca2+ response. This mitochondrial Ca2+ cycling helps shape Ca2+ transients and regulates Ca2+-dependent functions in neurons such as excitability, synaptic plasticity, bioenergetics, and survival. Therefore identifying the molecular components of mitochondrial Ca2+ transport in neurons and defining their pharmacological and functional properties presents an important and challenging task for neuroscientists. Fulfilling this task requires a set of tools for simple and reliable measurement of Ca2+ concentration inside and outside mitochondria, i.e., within the mitochondrial matrix and cytosol, respectively. In this chapter we describe instrumentation and techniques for simultaneous measurements of mitoc hondrial and cytosolic Ca2+ concentration in central and peripheral neurons by using synthetic (e.g., Fura-2 ) and genetic (e.g., mito-R-GECO1 ) fluorescent Ca2+ indicators. We include detailed protocols for preparing primary cultures of hippocampal and dorsal root ganglion (DRG) sensory neurons, gene transfer into these cells and the use of fluorescent microscopy and patch clam p for comprehensive characterization of Ca2+ fluxes across the mitochondrial and plasma membranes.
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Acknowledgments
This work was supported by NIH/NINDS grants NS087068 and NS096246. J.E.R. was supported by a predoctoral fellowship through the American Heart Association, Midwest Affiliate Grant 15PRE25310013.
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Rysted, J.E., Lin, Z., Usachev, Y.M. (2017). Techniques for Simultaneous Mitochondrial and Cytosolic Ca2+ Imaging in Neurons. In: Strack, S., Usachev, Y. (eds) Techniques to Investigate Mitochondrial Function in Neurons. Neuromethods, vol 123. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-6890-9_8
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