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Calcium imaging using fluorescence lifetimes and long-wavelength probes

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Abstract

We describe imaging of calcium concentrations using the long-wavelength Ca2+ indicators, Calcium Green, Orange, and Crimson. The lifetimes of these probes were measured using the frequency-domain method and were found to increase from 50% to severalfold in response to calcium. The two-dimensional images of the calcium concentration were obtained using a new apparatus for fluorescence lifetime imaging (FLIM). We also describe procedures to correct for the position-dependent frequency response of the gain-modulated image intensifier used in the FLIM apparatus. Importantly, the FLIM method does not require the probe to display shifts in the excitation or emission spectra. Using the FLIM method, calcium imaging is possible using probes which display changes in lifetime in response to calcium. Consequently, calcium imaging is possible with excitation wavelengths ranging from 488 to as long as 620 nm, where autofluorescence and/or photochemical damage is minimal. These probes are also suitable for calcium measurements of single cells using lifetime-based flow cytometry.

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Lakowicz, J.R., Szmacinski, H. & Johnson, M.L. Calcium imaging using fluorescence lifetimes and long-wavelength probes. J Fluoresc 2, 47–62 (1992). https://doi.org/10.1007/BF00866388

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  • DOI: https://doi.org/10.1007/BF00866388

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