CD4^＋CD25^＋调节性T细胞对哮喘大鼠气道炎症的影响

目的观察CD4^＋CD25^＋调节性T细胞（CD4^＋CD25^＋Treg）对哮喘大鼠气道炎症的影响。方法将卵白蛋白（OVA）免疫耐受大鼠CD4^＋CD25^＋Treg细胞过继转移给哮喘大鼠，然后观察支气管肺泡灌洗液（BALF）中细胞计数及分类，ELISA检测BALF中IL-4、IL-5和IFN-1及血清OVA特异性IgE含量，HE染色观察肺组织的病理改变。结果与哮喘组比较，过继转移CD4^＋CD25^＋Treg细胞后哮喘大鼠BALF中细胞总数、中性粒细胞和淋巴细胞百分率降低（P〈0．05），嗜酸性粒细胞（Eos）百分率明显降低（P〈0．01）；BALF中IL4和IL-5含量明显降低，IFN-1含量明显升高，血清OVA特异性IgE含量明显降低（P〈0．05）；气道炎症明显减轻。结论过继转移OVA免疫耐受大鼠CD4^＋CD25^＋Treg细胞可以明显抑制哮喘的慢性气道炎症。

The effects of CD4~+ CD25~+ regulatory T cells on the airway inflammation of asthmatic rats

Objective To observe the effects of CD4~+ CD25~+ regulatory T cells ( CD4~+ CD25~+ Treg) on the airway inflammation of asthmatic rats. Methods CD4~+ CD25~+ Treg of OVA- immune tolerance rats were transferred to asthmatic rats. Then bronchoalveolar lavage fluid (BALF) was collected, and cytology study was conducted. The IL-4, IL-5, IFN-γ and OVA-specific serum IgE level in BALF were determined by ELISA. The lung tissue was obtained, and histologieal analysis was done through H. E. Results Total cells number, the percentage of lymphocytes and neutrophils in BALF, the IL-4 and IL-5 BALF levels and the OVA-specific serum IgE level of adoptive transfer group were decreased ( P < 0.05 ) , and the percentage of eosinophils ( Eos) was significantly lower than that of asthma group ( P < 0.01) , while its BALF IFN-γ level was higher than that of asthma group( P <0. 05). Compared with that of asthma group, peribronchiole inflammatory of treated group was alleviated. Conclusion CD4 ~+ CD25~+ Treg of OVA- immune tolerance rats transferred to asthmatic rats can significantly alleviate the airway inflammation of asthmatic rats.