HSP70/CD80嵌合DNA疫苗对哮喘小鼠气道炎症和气道高反应性的作用

目的 研究HSP70/CD80嵌合DNA质粒对哮喘小鼠气道炎症和气道高反应性的作用,为安全可靠的新型免疫调节性疫苗奠定基础.方法 将40只雌性健康BALB/c小鼠随机分为4组:对照组、哮喘组、pcDNA3.1载体组、HSP70/CD80嵌合DNA疫苗组,每组10只.用HSP70/CD80嵌合疫苗免疫小鼠后,建立鸡卵清蛋白致敏的小鼠哮喘模型,观察其气道阻力变化,支气管肺泡灌洗液中IL-13、IFN-γ含量的变化.取肺组织进行病理组织学分析,观察肺内炎症情况.结果 HSP70/CD80嵌合DNA疫苗免疫小鼠后,能有效减轻气道炎症(P＜0.05),降低气道阻力(P＜0.05),肺泡灌洗液中IFNl的分泌增加(P＜0.05),IL-13降低.结论 HSP70/CD80嵌合DNA疫苗可促进免疫反应向Th1偏移并增加IFN-γ的生成,减轻气道炎症,降低气道阻力,这为过敏性哮喘新型免疫调节性疫苗的机制及应用研究提供了实验资料.

The effects of HSP70/CD80 DNA vaccine on airway inflammation and hyperresponsiveness of asthmatic mice

Objective To investigate the effect of HSP70/CD80 DNA vaccine on the airway inflammation and hyperresponsiveness of asthmatic mice. Methods Forty female healthy BALB/c mice were randomly divided into 4 groups; saline group, asthma group, pcDNA3. 1 plasmid control group, and prevention group with HSP70/CD80 DNA vaccine, with 10 mice in each group. The mice were immunized by intramuscular( i. m. ) injection with HSP70/CD80 DNA vaccine before sensitization and challenge with ovalbumin. Then, the murine model of allergic asthma was made with injection of ovalbumin intraperitoneal ( i. p. ) , and inhalation of ovalbumin. Before mice were sanctified, their airway hyperresponsiveness( AHR) was measured. After mice were sanctified, bronchoalveolar lavage fluid( BALF) was obtained and cytokine IL-13 and IFN-γ were measured. And the lung histology and histochemistry were examined. Results Compared with mice in asthma and pcDNA3. 1 group, mice in vaccine group showed significantly reduced airway inflammation (P＜0. 05) and AHR (P＜0. 05). IFN-γ content in BALF were increased in mice from vaccine group compared with the asthma group and the pcDNA3. 1 group ( P ＜0. 05) , and IL-13 content in BALF were decreased. Conclusion HSF70/CD80 DNA vaccine can reduce airway inflammation and hyperresponsiveness in asthmatic mouse and this chimerical plasmid could be a candidate vaccine to prevent asthma.