Figure 5. Functional effect of aptamers on β2AR–mediated Gαs and AC activation.
β2AR-dependent stimulation of AC activity and accumulation of cAMP was measured in HEK-293 membrane homogenates stably expressing β2AR (expression level: ~2.5 pmoles/mg) in the presence of 100 nM of isoproterenol (ISO) or combination of 100 nM ISO with aptamer (A1, A2, A13, A16 or control aptamer). Data represents the means ± s.e.m. of at least four independent experiments. Asterisks in the bar graphs denote significant differences (*P < 0.05; **P < 0.01) by one-way ANOVA (with Tukey’s multiple comparisons test) from results for AC activity performed with control aptamer.