Methods 24 health males of Wistar rats were randomly divided into three groups (group A: normal control group, group B: COPD model group, group C: group pretreated with prednisone), of which each got 8 rats for this study project.

• 方法Wistar大鼠24只随机分为:正常对照组(A组)、单纯熏烟组(B组)和熏烟+泼尼松组(C组),每组各8只。