Abstract
The use of fluorescent indicators for monitoring calcium (Ca(2+)) signals and for measuring Ca(2+) concentration ([Ca(2+)]) in living cells is described. The following topics are covered in detail: (1) ratiometric and nonratiometric fluorescent indicators and the principles underlying their use, (2) techniques for loading Ca(2+) indicators and Ca(2+) buffers into living cells, (3) calibration of indicator fluorescence intensity measurements to yield values of intracellular [Ca(2+)], (4) analysis of nonratiometric fluorescence intensity data and caveats relating to their interpretation, (5) techniques for manipulating intracellular and extracellular [Ca(2+)], and (6) the use of fluorescent indicators to monitor Ca(2+) signals in mitochondria. The chapter aims to present these fundamental topics in a manner that is practically useful and intuitively accessible. The origins of key mathematical equations used in the article are outlined in two appendices.
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