Figure 2.
Formoterol upregulates the expression of M3R. (A) Protein expression in airway smooth muscle cells treated with or without 10−5 mmol/l formoterol at the indicated time points were examined by western blot analysis. (B) Protein expression of M3R was determined by densitometry and was normalized to the β-actin control. The data are expressed as the mean ± standard deviation from three independent experiments (*P<0.05, compared with the untreated 0 h group). M3R, muscarinic M3 receptor; Con, control.