
Figure 1. Histamine-induced concentration-dependent stimulation of intracellular calcium mobilization in HEK293/H1 cells. The cells were loaded with Calcium-4 (Cat. No. R8141; Molecular Devices) prior to being stimulated with agonist Histamine. The intracellular calcium change was normalized and measured by FLIPR. The relative fluorescent units (RFU) were normalized and plotted against the log of the cumulative doses of Histamine (Mean ± SEM, n = 3). The EC50 of Histamine on this cell was 0.65 nM.
Notes:
EC50 value is calculated with four parameter logistic equation:
Y=Bottom + (Top-Bottom) / (1+10^((LogEC50-X)*Hill Slope))
X is the logarithm of concentration. Y is the response
Y is % stimulation of RFU and starts at Bottom and goes to Top with a sigmoid shape.
HEK293/H1 Stable Cell Line
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