Calcium Green-5N AM | CAS 216699-33-1

Calcium Green-5N AM is a cell-permeant acetoxymethyl (AM) ester fluorescent indicator designed for monitoring intracellular calcium dynamics. Upon intracellular esterase cleavage, it generates the corresponding calcium-binding fluorophore, enabling fluorescence-based readout of Ca2+ fluctuations in live-cell imaging and calcium signaling assays. Its green emission profile and ratiometric-friendly behavior in common excitation channels make it widely used in mechanistic studies of stimulus-response signaling and calcium-dependent processes.

1. Live-Cell Calcium Imaging

Calcium Green-5N AM is frequently used by cell biology and neuroscience researchers to visualize stimulus-evoked Ca2+ transients in cultured cells using fluorescence microscopy. After AM uptake and intracellular de-esterification, the Ca2+-bound form produces a strong fluorescence increase that can be tracked over time to quantify onset kinetics, peak amplitude, and recovery phases. This workflow is commonly paired with widefield fluorescence, spinning-disk confocal, or high-content imaging platforms to map spatial patterns of calcium signaling across cell populations.

2. Flow Cytometry Calcium Assays

Calcium Green-5N AM supports fluorescence-based quantification of intracellular calcium levels in suspension cells, including primary cell preparations and engineered cell lines used in signaling research. Researchers typically load cells with the AM dye, allow de-esterification, and then stimulate or perturb calcium handling before measuring fluorescence intensity by flow cytometry. This approach is used to compare calcium response distributions across experimental conditions, enabling population-level readouts of Ca2+ mobilization and calcium-dependent phenotypes in assay development and screening workflows.

3. Calcium-Dependent Bioassay Development

Calcium Green-5N AM is commonly incorporated into plate-based fluorescence assays for monitoring Ca2+ flux in response to receptor agonists, channel modulators, or intracellular signaling perturbations. In these formats, the dye provides a direct optical signal that tracks calcium mobilization in real time, supporting assay optimization for throughput-compatible workflows. Bioassay developers use the green emission readout to establish robust experimental timing windows, evaluate response curves, and support comparative studies of calcium signaling pathways in cell-based test systems.

4. Neuronal Signaling Studies

Calcium Green-5N AM is widely used in electrophysiology-adjacent and imaging-based studies to monitor Ca2+ activity associated with neuronal stimulation, synaptic signaling, or network activity in neuronal cultures. Researchers leverage its ability to report intracellular calcium changes with temporal resolution suitable for dynamic signaling experiments, often combining it with controlled stimulation paradigms and time-lapse imaging. This makes the dye a practical tool for correlating calcium transients with experimental manipulations that affect neuronal excitability and calcium-dependent downstream responses.