Effect of reserpine on the production of IL-10 and of TGF-β by Tregs. Cells were incubated for 24 hours alone (□) or in the presence of reserpine without (▪) or with (▨) antagonists selective for dopaminergic receptors and ARs. Each column is the mean ± SEM of 3 to 9 separate experiments. *P < .05 and **P < .01 versus control; #P < .05 versus reserpine alone.