Fig. 5.

Inhibitory effects of ractopamine or salbutamol on the sulfation of dopamine by SULT1A3. Enzymatic assays using SULT1A3 with 5 µM dopamine as a substrate in the presence of varying concentrations of ractopamine (0.1–1,000 µM) or salbutamol (0.1–4,000 µM) were carried out. Data from three experiments were calculated based on the activity determined in the absence of inhibitor as 100%.