中国寄生虫学与寄生虫病杂志 ›› 2006, Vol. 24 ›› Issue (6): 4-419.

• 论著 • 上一篇    下一篇

重组屋尘螨2类变应原疫苗免疫治疗小鼠过敏性气道炎症的研究

喻海琼1,2,刘志刚1;于琨瑛3;许卓谦2;丘劲1   

  1. 1 深圳大学过敏反应与免疫学研究所, 深圳 518060; 2 广州医学院, 广州 510182; 3 南昌大学医学院, 南昌 330006
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2006-12-30 发布日期:2006-12-30
  • 通讯作者: 刘志刚

Immunotherapy with Recombinant House Dust Mite Group 2 Allergen Vaccine Inhibits Allergic Airway Inflammation in Mice

YU Hai-qiong1,2;LIU Zhi-gang1;YU Kun-ying3;XU Zuo-qian2;QIU Jing1   

  1. 1 Allergy and Immunology Institute,Shenzhen University,Shenzhen 518060,China; 2 Guangzhou Medical College, Guangzhou 510182,China;3 College of Medicine,Nanchang University,Nanchang 330006,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2006-12-30 Published:2006-12-30
  • Contact: LIU Zhi-gang

摘要: 目的 观察以聚乳酸-羟基乙酸共聚物(PLGA)材料为佐剂制备的重组屋尘螨2类变应原(rDer p 2)纳米微粒疫苗(DEPN)对小鼠过敏性气道炎症的影响,并探讨其免疫治疗机 制。 方法 制备PLGA-rDer p 2纳米粒子并鉴定其特性。40只BALB/c小鼠随机分为5组,A组(对照组)均给予生理盐水(100 μl)。B、C、D和E组腹部皮下注射屋尘螨粗浸液(10 μg)免疫小鼠致敏,然后分别用PBS(100 μl)、2 mg 空白PLGA粒子(empty PLGA,EP)、100 μg rDer p 2、2 mg的DEPN纳米疫苗(载有100 μg rDer p 2)皮下注射进行免疫治疗,连续免疫治疗3 d,1次/d,各组用rDer p 2(50 μg)滴鼻激发,激发后第2天剖杀,收集支气管肺泡灌洗液(BALF)并对细胞进行总计数和分类计数;HE染色和PAS染色(Periodic Acid?鄄Schiff Stain)观察小鼠肺部组织炎症和支气管黏液分泌;用ELISA检测BALF和脾细胞培养上清的细胞因子(IL-4、 IFN-γ)和血清中变应原特异性IgG2a和IgE抗体浓度。 结果 B、C 组肺部呈明显的变态反应性炎症,D、E组变应原诱导的肺部嗜酸粒细胞浸润和黏液分泌比B、C 组显著减轻。BALF中的细胞总数B组比A组明显增多,分类细胞以中性和嗜酸粒细胞为主,超过50%。rDer p 2特异性IgE抗体水平,D组(0.93±0.04)和E组(0.77±0.10)均低于B组(1.14±0.10)(P<0.01);特异性IgG2a抗体水平,D组(1.02±0.01)和E组(1.17±0.46)均高于B组(0.14±0.01)(P<0.01)。在BALF中,D组[(55.60±3.79) pg/ml]和E组[(48.60±4.50) pg/ml]IL-4水平均低于B组[(78.90±6.07) pg/ml](P<0.01);IFN-γ水平E组[(68.50±2.87) pg/ml]显著高于B组[(27.30±3.51) pg/ml] (P<0.01)。脾细胞上清的IL-4水平,D组[(56.3±4.85) pg/ml]和E组[(40.2±4.36) pg/ml]显著低于B组[(81.20±6.84) pg/ml] (P<0.01);IFN-γ水平,E组[(70.20±3.85) pg/ml]显著高于B组[(34.60±2.25) pg/ml] 。 结论 DEPN免疫治疗可抑制小鼠肺部过敏炎症,其机制可能与调节Th1/Th2平衡有关。

关键词: 聚乳酸-羟基乙酸共聚物(PLGA), 屋尘螨, 变应原, 纳米微粒, 过敏性气道炎症, 小鼠

Abstract: Objective To investigate the efficacy and mechanism of subcutaneously given recombinant Der p 2 entrapped PLGA nanoparticles (DEPN) on mouse model with allergic airway inflammation. Methods 40 BALB/c mice were randomly divided into 5 groups, group A (normal control) were treated with saline (100 μl) all the time, groups B, C, D and E were sensitized intraperitoneally with crude dust mite extracts (10 μg) and then subcutaneously treated respectively with PBS (100 μl), 2 mg empty PLGA (EP), 100 μg rDer p 2, and 2 mg DEPN (loaded with 100 μg rDer p 2) for 3 times, once per day, followed by intranasal challenge of 50 μg rDer p 2. One day post challenge, mice were sac-rificed and bronchoalveolar lavage fluid (BALF) was collected. Number of the total cells and eosinophils was deter-mined, and airway inflammation and mucus secretion were analyzed by haematoxylin and eosin (H&E) staining and pe-riodic acid-Schiff (PAS) staining. Level of cytokines in the supernatant of splenocyte culture was assayed by ELISA. Level of rDer p 2 specific IgG2a and IgE in the sera was determined by ELISA. Results The lung histology showed devel-opment of eosinophil infiltration in the airway of mice in groups B and C. The lung inflammation and mucus secretion in groups D and E were significantly alleviated than that of groups B and C. Number of total cells (63.50±5.12) and eosinophils (15.32±3.04) in BALF decreased in group B. Compared with group B, the number of total cells in groups D(55.3±5.20) × 104 /ml and E (41.00±4.91) ×104 /ml greatly decreased (P<0.05), and same with that of eosinophils in groups D (9.56±1.09) ×104 /ml and E (3.22±0.31) ×104 /ml. The rDer p 2 specific IgE and IgG2a antibodies in group B were 1.14±0.105 and 0.14±0.07 respectively. The level of specific IgE was significantly lower (P<0.01) in groups D (0.93±0.04) and E (0.77±0.09), and that of IgG2a in groups D (1.02±0.01) and E (1.17±0.46) were significantly higher (P<0.01) than that in group B. The level of IL-4 and IFN-γ in BALF in group B were (78.90±6.07) pg/ml and (27.30±3.51) pg/ml respectively. IL-4 in groups D and E was (55.6±3.79) pg/ml and (48.6±4.50)pg/ml respectively, significantly lower (P<0.01) than that of group B; while IFN-γ (68.50±2.87) pg/ml in group E was significantly higher than that of group B (P<0.01). IL-4 released from cultured splenocytes in groups D and E was (56.30±4.85) pg/ml and (40.20±4.36) pg/ml respectively, significantly lower than that in group B (81.2±6.84 pg/ml) (P<0.01). The released IFN-γ in group E was (70.20±3.85) pg/ml, significantly higher than in group B (34.60±2.25) pg/ml (P<0.01). Conclusion DEPN can in-hibit airway allergic inflammation, its mechanism may be relevant to a balance of Th1 and Th2.

Key words: Poly(D, L-lactic-co-glycolic)acid(PLGA), House dust mite, Allergen, rticle, Allergic airway inflammation, Mouse