MUC5AC and chronic obstructive pulmonary disease: MUC5AC mRNA RQ was 0.35 ± 0.06 in the positive control group treated with dexamethasone following COPD inducement and 0.66 ± 0.14, 1.42 ± 0.08, and 0.36 ± 0.08 pg/mL in the experimental group treated with 100, 200, and 400 mg/kg GGS01, respectively.