
Figure 1. Somatostatin-14-induced concentration-dependent stimulation of intracellular calcium mobilization in CHO-K1/SST5/Gα15 cells. The cells were loaded with Calcium-4 (Cat. No. R8142; Molecular Devices) prior to stimulation with SST5 agonist, somatostatin-14. 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 somatostatin-14 (mean ± SEM, n = 3). The EC50 of somatostatin-14 on CHO-K1/SST5/Gα15 cells was 0.35 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 IP-One accumulation upon treatment with somatostatin-14 in CHO-K1/SST5/Gα15 cells. d2 acceptor fluorophore-labeled IP-One (Cat. No. 62IPAPEB; Revvity) and intracellular IP-One in CHO-K1/SST5/Gα15 cells competitively bind with Europium Cryptate-labeled anti-IP-One antibody. The FRET signal decreases as the intracellular IP-One concentration rises and was measured by plate reader (Pherastar, BMG). The EC50 of somatostatin-14 on CHO-K1/SST5/Gα15 cells was 0.19 μM.
CHO-K1/SST5/Gα15 Stable Cell Line
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