Stimulation by agonists of [35S]GTPγS binding to membranes containing the α2A-adrenergic receptor
| Agonist | n | log EC50 | Stimulation | Slope |
|---|---|---|---|---|
| Emax/basal | ||||
| Guanabenz | 2 | −7.83 ± 0.08 | 2.52 ± 0.08 | −0.67 ± 0.07 |
| UK14304 | 4 | −7.77 ± 0.02 | 5.54 ± 0.25 | −0.66 ± 0.02 |
| p-Aminoclonidine | 3 | −7.64 ± 0.02 | 2.76 ± 0.16 | −0.81 ± 0.04 |
| Clonidine | 2 | −7.52 ± 0.01 | 2.98 ± 0.35 | −0.78 ± 0.03 |
| Epinephrine | 3 | −6.75 ± 0.12 | 5.49 ± 0.23 | −0.62 ± 0.03 |
| Norepinephrine | 6 | −6.19 ± 0.06 | 5.19 ± 0.10 | −0.64 ± 0.02 |
Membranes were incubated at 30°C for 60 min with GDP, [35S]GTPγS, sodium metabisulfite (epinephrine and norepinephrine only), and an increasing concentration of agonist in duplicate. The data from each experiment were fitted with a four-parameter logistic equation, to give the log EC50,E max, and basal and slopes for each dose-response curve. Values are means ± S.E. of n experiments.