Methods Forty mice were divided into 4 groups, chronic asthma group (AG), control group (CG), early treatment group (EG), late treatment group (LG).

• 方法40只小鼠随机均分为对照组、早期布地奈德治疗组(早期组)、延迟布地奈德治疗组(晚期组)和哮喘组4组。