Figure 1. Response of ACTOne SSTR5 cell line & parental cell line to SST. ACTOne SSTR5 cells and parental cells (AG-10200-200) were plated overnight in 20 ml culture medium on a BD Biocoat 384 well plate. The next day, cells were dye-loaded with 20 ml/well of 1X Dye-loading solution (ACTOne Membrane Potential Assay Kit). After 2 hours of incubation at room temperature, two readings were obtained prior to and 40 min after the addition of SST. Ratios of the two readings (F/F0) are plotted in the figure. . Dose response curve of SST in ACTOne SSTR5 cell line. EC50 = 2.81 nM in the presence of PDE inhibitor Ro20-1724 and b-adrenoceptor agonist isoproterenol. . Parental cells do not respond to SST.