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Updated: May 14, 2026

Imaging Local Ca2+ Signals in Cultured Mammalian Cells

Imaging Local Ca²⁺ Signals in Cultured Mammalian Cells

Published on: March 3, 2015

Converting fluorescence data into Ca2+ concentration.

Martin D Bootman¹, Katja Rietdorf, Tony Collins

¹Babraham Institute, Babraham, Cambridge, CB22 3AT, United Kingdom. martin.bootman@babraham.ac.uk

Cold Spring Harbor Protocols

|February 5, 2013

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Fluorescent calcium (Ca2+) reporters indicate concentration changes but are not linear. Calibration is needed to convert fluorescence emission into accurate cellular Ca2+ concentration data for reliable analysis.

Area of Science:

Biochemistry
Cell Biology
Biophysics

Background:

Fluorescent calcium reporters are widely used to detect cellular calcium concentration changes.
Monitoring fluorescence emission provides kinetic and spatial information about calcium signals.
The relationship between fluorescence and calcium concentration is non-linear, following a logistic function.

Purpose of the Study:

To highlight the limitations of using raw fluorescence data for quantitative calcium analysis.
To emphasize the necessity of calibrating fluorescent calcium reporters for accurate measurements.
To guide researchers in obtaining precise cellular calcium concentration data.

Main Methods:

Analysis of the fluorescence emission properties of calcium indicators.

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Last Updated: May 14, 2026

Imaging Local Ca2+ Signals in Cultured Mammalian Cells

Imaging Local Ca²⁺ Signals in Cultured Mammalian Cells

Published on: March 3, 2015

Imaging Ca2+ Dynamics in Cone Photoreceptor Axon Terminals of the Mouse Retina

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Published on: May 6, 2015

Measurement of Calcium Fluctuations Within the Sarcoplasmic Reticulum of Cultured Smooth Muscle Cells Using FRET-based Confocal Imaging

Measurement of Calcium Fluctuations Within the Sarcoplasmic Reticulum of Cultured Smooth Muscle Cells Using FRET-based Confocal Imaging

Published on: June 20, 2016

Understanding the logistic function describing fluorescence-Ca(2+) relationship.

Developing calibration strategies for fluorescence-based calcium measurements.

Main Results:

Fluorescence emission from calcium indicators does not directly correlate linearly with calcium concentration.
Raw fluorescence data is insufficient for generating accurate mean amplitude data.
Calibration enables the conversion of fluorescence output to actual calcium concentrations.

Conclusions:

Raw fluorescence monitoring offers a relative calcium signal but is unsuitable for quantitative amplitude analysis.
Calibration of fluorescent calcium reporters is essential for accurate cellular calcium concentration determination.
Proper calibration allows for the generation of reliable quantitative data from calcium imaging experiments.