
Figure 1: NECA-induced concentration-dependent stimulation of intracellular calcium mobilization in CHO-K1/ADORA2B/Gα15 cells. The cells were loaded with Calcium-4 (Cat. No. R8142; Molecular Devices) prior to stimulation with ADORA2B agonist, NECA. 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 NECA (mean ± SEM, n = 3). The EC50 of NECA on CHO-K1/ADORA2B/Gα15 cells was 0.24 μM.
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 along a sigmoid curve.

Figure 2. Dose dependent stimulation of intracellular cAMP accumulation upon treatment with NECA in CHO-K1/ADORA2B/Gα15 cells. d2 acceptor fluorophore -labeled cAMP (Cat. No. 62AM4PEC; Revvity) and intracellular cAMP in CHO-K1/ADORA2B/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 (Pherastar, BMG). The EC50 of NECA on CHO-K1/ADORA2B/Gα15 cells was 15.58 nM.
CHO-K1/ADORA2B/Gα15 Stable Cell Line
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