Expression of TRPV1 protein in rat ASMC of each group. Representative images of immunofluorescent labeling for TRPV1 in rat ASMC of control group (A), chronic asthma group (B) and SMI group (C). The positive staining of TRPV1 was red fluorescence in membrane and cytoplasm.Nuclei were dyed with blue. Bar = 10 μm. D. Summarized data of TRPV1 protein expression in ASMC of each group. The mean fluorescence intensity of control group was set to 1.0. The mean fluorescence intensity of the other two groups was normalized to control group. **P < 0.01 vs. the control group. # #P < 0.01 vs. the asthma group.