Changes in intracellular Ca2+ concentration are an important analysis target in the study of intracellular signal transduction related to physiological phenomenon, such as muscle cell contraction. The following are the results of imaging and analysis of the increase of intracellular Ca2+ concentration in A10 cells, using the CellVoyager, by treatment of ionomycin, a Ca2+ ionophore.
Using Ca2+ probe, Fluo4, images were captured using the CellVoyager (Fig. 1a~1c), and temporal changes in intracellular Ca2+ concentration were analyzed with its analysis software. The analysis software allows for the recognition of individual cells, thus enabling data acquisition for temporal changes in individual cells (Fig. 2a). Therefore, it is possible to exclude cells with abnormal reactions and analyze cells with pathognomonic reactions only. In addition, by varying the type and concentration of reagents for each well, variation in reactions can be analyzed (Fig. 2b, 2c).
Fig. 1a:Images taken at 0.2sec intervals, from 2.6sec to 5.4sec after the start of imaging. Ionomycin stimulation was started 3.0sec after the start of imaging (the image in red frame).
Fig. 1b: Time lapse movie
Fig. 2a: Kinetic analysis of Fluo4 bright intensities of individual cells in each well
Fig. 2b: Kinetic analysis of average Fluo4 bright intensities in each well
Fig. 2c: Kinetic analysis of average Fluo4 bright intensities at various ionomycin concentrations
*For all graphs above, the fluorescence intensity at 2.9sec after the start of imaging is converted to zero as a reference.
Experiment procedure / Analysis method
Preparation of reagents
A10 cells were seeded on 96-well plates at the ratio of 10,000 cells/well and cultured for 24 hours, then a CO2 indicator, Fluo4, was added (Final concentration 1μM, reaction time: 20min), to monitor intercellular Ca2+-influx.
Time lapse images were captured using the CellVoyager CV6000 under the following conditions.
Ionomycin was added to the cells using the built-in pipettor.
- Magnification: 20x objective lens
- Exposure time: 100msec
- Imaging interval: 100msec over a period of 20sec
- Ionomycin dripping: 50μM 3sec after the start of imaging
- Ionomycin final concentration: 0~5μM
- Images captured per well: 1 Field(well center)
- Ionomycin treatment conditions:
- Air gap: 30μl
- Aspirate volume: 50μl
- Aspirate speed: 33μl/sec
- Dispense volume: 80μl
- Dispense speed: 22μl/sec
Built-in pipettor setting (Kinetics Module)
Ionomycin was dispensed from each well of the source plate into each well of the assay plate (A10 cells) in one to one correspondence.
The images were analyzed using the analysis software under the following conditions.
- Graphs were created using Spotfire®.
- Binarization: Sigma Threshold Object Diameter  Sigma 
- Binary Transform: Opening Circle Circle Radius 
- Labeling: Divide Each Region Watershed Threshold  Select Region For Area MinArea  MaxArea 
- Logical Operating: Region Operator Region1 [After Labeling] Operator Type [EXPAND] Region2 [Cytoplasm]
Spotfire® is a registered trademark of TIBCO Software Inc.
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