
Figure 1: Calcitonin-induced concentration-dependent stimulation of intracellular calcium mobilization in CHO-K1/CT/Gα15 cells. The cells were loaded with Calcium-4 (Cat. No. R8142; Molecular Devices) prior to stimulation with CT agonist, calcitonin. The intracellular calcium change was measured by FLIPRTETRA. The relative fluorescent units (RFU) were recorded and normalized to plot against the log of the cumulative doses of calcitonin (mean ± SEM, n = 3). The EC50 of calcitonin on CHO-K1/CT/Gα15 cells was 18.88 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 RFU and starts at Bottom and goes to Top along a sigmoid curve.

Figure 2. Dose dependent stimulation of intracellular cAMP mobilization upon treatment with calcitonin in CHO-K1/CT/Gα15 cells. d2 acceptor fluorophore-labeled cAMP (Cat. No. 62AM4PEC; Revvity) and intracellular cAMP in CHO-K1/CT/Gα15 cells competitively bind with Europium Cryptate-labeled anti-cAMP monoclonal antibody. The FRET signal decreases as the intracellular cAMP concentration rises and was measured by plate reader (Varioskan, Thermo Fisher). The EC50 of calcitonin was 0.27 nM.
CHO-K1/CT/Gα15 Stable Cell Line
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