Chapter title |
Quantitative Ratiometric Ca2+ Imaging to Assess Cell Viability
|
---|---|
Chapter number | 14 |
Book title |
Cell Viability Assays
|
Published in |
Methods in molecular biology, January 2017
|
DOI | 10.1007/978-1-4939-6960-9_14 |
Pubmed ID | |
Book ISBNs |
978-1-4939-6959-3, 978-1-4939-6960-9
|
Authors |
Oliver Friedrich, Stewart I. Head, Friedrich, Oliver, Head, Stewart I. |
Editors |
Daniel F. Gilbert, Oliver Friedrich |
Abstract |
Viability of cells is strongly related to their Ca(2+) homeostasis. Ca(2+) signal fluctuations can be on a slow time scale, e.g., in non-excitable cells, but also in the range of tens of milliseconds for excitable cells, such as nerve and muscle. Muscle fibers respond to electrical stimulation with Ca(2+) transients that exceed their resting basal level about 100 times. Fluorescent Ca(2+) dyes have become an indispensable means to monitor Ca(2+) fluctuations in living cells online. Fluorescence intensity of such "environmental dyes" relies on a buffer-ligand interaction which is not only governed by laws of mass action but also by binding and unbinding kinetics that have to be considered for proper Ca(2+) kinetics and amplitude validation. The concept of Ca(2+) dyes including the different approaches using ratiometric and non-ratiometric dyes, the way to correctly choose dyes according to their low-/high-affinity properties and kinetics as well as staining techniques, and in situ calibration are reviewed and explained. We provide detailed protocols to apply ratiometric Fura-2 imaging of resting Ca(2+) and Ca(2+) fluctuations during field-stimulation in single isolated skeletal muscle cells and how to translate fluorescence intensities into absolute Ca(2+) concentrations using appropriate calibration techniques. |
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