
Figure 1. NECA-induced concentration-dependent stimulation of intracellular calcium mobilization in CHO-K1/ADORA1/Gα15 cells. The cells were loaded with Calcium-4 (Cat. No. R8142; Molecular Devices) prior to stimulation with ADORA1 agonist, NECA (Cat. No. HY-103173, MCE). The intracellular calcium change was measured by FLIPRTETRA. The relative fluorescent units (RFU) were recorded and plotted against the log of the cumulative doses of NECA (mean ± SEM, n = 3). The EC50 of NECA on CHO-K1/ADORA1/Gα15 cells was 0.12 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 ?RFU and starts at Bottom and goes to Top along a sigmoid curve.

Figure 2. Dose dependent increase of intracellular cAMP accumulation upon treatment with CGS-15943 in CHO-K1/ADORA1/Gα15 cells. d2 acceptor fluorophore-labeled cAMP (Cat. No. 62AM4PEC; Revvity) and intracellular cAMP in CHO-K1/ADORA1/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 CGS-15943 on CHO-K1/ADORA1/Gα15 cells was 67.83 nM.
CHO-K1/ADORA1/Gα15 Stable Cell Line
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