中国寄生虫学与寄生虫病杂志 ›› 2014, Vol. 32 ›› Issue (4): 5-268-273.

• 论著 • 上一篇    下一篇

粉尘螨变应原Der f 1 mRNA对小鼠特异性免疫治疗的实验研究

姜玉新1 *,尹康2,靳文杰2,吴露依2,李朝品3   

  1. 皖南医学院,1 基础医学院生理学教研室;2 临床医学院;3 基础医学院医学寄生虫学教研室,芜湖241002
  • 出版日期:2014-08-30 发布日期:2014-10-31

Experimental Study on the Der f 1 mRNA Molecules Derived from Dermatophagoides farinae for Specific Immunotherapy on Murine Model of Asthma

JIANG Yu-xin1 *,YIN Kang2,JIN Wen-jie2,WU Lu-yi2,LI Chao-pin3   

  1. Wannan Medical College,1 Department of Physiology,2 School of Clinical Medicine,3 Department of Medical Parasitology,Wuhu 241002,China
  • Online:2014-08-30 Published:2014-10-31

摘要:

  目的  探讨粉尘螨变应原Der f 1 mRNA疫苗对哮喘小鼠的特异性免疫治疗效果。 方法 50只BALB/c小鼠随机分为5组(10只/组),分别为PBS组、Der f 1 变应原致敏组、Der f 1 变应原免疫治疗组、β-actin mRNA免疫治疗组和Der f 1 mRNA免疫治疗组。分别于第0、第7和第14天,PBS组小鼠腹腔注射PBS,其余4组小鼠则腹腔注射10 μg Der f 1进行致敏,建立小鼠哮喘模型。自第21天起,除PBS组小鼠雾化吸入PBS,其他4组小鼠均雾化吸入100 μg/ml Der f 1 变应原,30 min/次,1次/d,连续7 d,观察并记录小鼠哮喘发作情况。5组小鼠于最后1次雾化吸入致敏2周后,背部皮下分别注射100 μl PBS、1 μg Der f 1 (维持致敏)、10 μg Der f 1 (免疫治疗)、2 μg β-actin mRNA和2 μg Der f 1 mRNA,1次/周,连续3周。最后1次皮下注射后2周处死小鼠。收集各组小鼠的支气管肺泡灌洗液(BALF),ELISA法检测γ干扰素(IFN-γ)和白介素13(IL-13)水平,并计数嗜酸粒细胞(EOS);收集各组小鼠脾组织,分离脾细胞,除PBS组外,其他4组均加入10 μg/ml Der f 1培养72 h,ELISA法检测脾细胞培养上清液中IFN-γ和IL-13水平;取各组小鼠眼球血,ELISA法检测血清中总IgE以及变应原特异性IgE(sIgE)、IgG1(sIgG1)和IgG2a(sIgG2a)抗体水平。HE染色观察各组小鼠肺组织切片。 结果  除PBS组外,其他4组小鼠雾化吸入致敏后,均出现急性哮喘发作症状。小鼠BALF中,Der f 1 mRNA 免疫治疗组和Der f 1 免疫治疗组的IFN-γ水平分别为(897.56±105.73)和(864.48±70.62)pg/ml,均明显高于Der f 1 变应原致敏组[(209.05±52.28)pg/ml]和β-actin mRNA免疫治疗组[(219.47±64.72)pg/ml](P<0.01);两者IL-13水平分别为(241.64±31.41)和(321.94±41.07)pg/ml,则明显低于Der f 1 变应原致敏组[(520.62±43.77)pg/ml]和β-actin mRNA免疫治疗组[(507.22±42.26)pg/ml](P<0.01);两者EOS数量分别为(1.33±0.44)×105和(1.48±0.39)×105个/ml,均明显低于Der f 1 变应原致敏组[(3.54±0.52)×105个/ml]和β-actin mRNA免疫治疗组[(2.98±0.53)×105个/ml](P<0.01)。脾细胞培养上清的ELISA检测结果显示,Der f 1 mRNA免疫治疗组和Der f 1 免疫治疗组的IFN-γ水平分别为(420.91±69.92)和(334.92±43.72)pg/ml,明显高于Der f 1 变应原致敏组[(123.75±15.48)pg/ml]和β-actin mRNA免疫治疗组[(128.84±59.00)pg/ml](P<0.01);两者IL-13水平[(268.51±40.42)和[(285.26±62.21)pg/ml]则显著低于Der f 1 变应原致敏组[(613.89±51.54)pg/ml]和β-actin mRNA免疫治疗组[(524.05±39.12)pg/ml](P<0.01)。血清中抗体水平的ELISA检测结果显示,Der f 1 mRNA免疫治疗组的总IgE、sIgE和sIgG1抗体水平分别为(33.72±9.78)、(22.76±8.09)和(17.87±7.59)ng/ml,均显著低于Der f 1 变应原致敏组[(94.34±11.66)、(65.67±9.47)和(75.18±9.52)ng/ml]和β-actin mRNA免疫治疗组[(86.48±10.26)、(62.36±8.35)和(69.51±8.98)ng/ml](P<0.01);其sIgG2a抗体水平为(7.74±0.88)ng/ml,则明显高于Der f 1 变应原致敏组[(2.81±1.17)ng/ml]和β-actin mRNA免疫治疗组[(1.06±0.11)ng/ml](P<0.01)。肺组织切片HE染色镜检结果显示,与Der f 1 变应原致敏组相比,Der f 1 mRNA免疫治疗组小鼠的气道上皮和肺泡上皮细胞结构基本完整,炎症细胞浸润明显减少。 结论 Der f 1 mRNA疫苗可有效纠正Th1/Th2失衡。

关键词: 粉尘螨, 变应原, mRNA疫苗, 特异性免疫治疗

Abstract:

Objective To investigate the effect of Der f 1 mRNA molecules for specific immunotherapy on murine model of asthma. Methods Fifty BALB/c mice were randomly divided into 5 groups: PBS group, Der f 1 sensitization group, Der f 1 specific immunotherapy(SIT) group, β-actin mRNA SIT group, and Der f 1 mRNA SIT group. On days 0, 7 and 14, mice in PBS group received PBS injection; mice in the other groups were intraperitoneally injected with 10 μg Der f 1. At day 21, the mice in the 4 experimental groups were challenged with a 30-min inhaled dose of Der f 1(100 μg/ml) for 7 successive days. Two weeks after the final sensitization, the mice in the above five groups were immunized by intradermal injection with PBS, 1 μg Der f 1, 10 μg Der f 1, 2 μg β-actin mRNA, and 2 μg Der f 1 mRNA, respectively for 3 times at one-week intervals. Two weeks after the last intradermal injection, all mice were sacrificed and bronchoalveolar lavage fluid (BALF) was collected. ELISA was performed to detect the levels of IFN-γ and IL-13 in BALF, the number of eosinophils in the BALF was recorded. Splenocytes were prepared, and cultured with Der f 1 allergen (10 μg/ml) for 72 h. Splenocytes of PBS group was cultured without Der f 1 allergen. The levels of IFN-γ and IL-13 in splenocyte culture supernatant were measured by ELISA, as well as serum antibody levels of total IgE, allergen-specific IgE (sIgE), sIgG1, and sIgG2a. Lung sections were stained in hematoxylin and eosin, and observed under the microsope. Results Except for PBS group, mice in the other 4 group showed symptoms of acute asthma attack. Compared with Der f 1 sensitization group [(897.56±105.73) pg/ml] and β-actin mRNA SIT group [(219.47±64.72) pg/ml], the level of IFN-γ in BALF from Der f 1 mRNA SIT group [(897.56±105.73) pg/ml] and Der f 1 SIT group [(864.48±70.62)pg/ml] significantly increased(P<0.01). However, the level of IL-13 in BALF from Der f 1 mRNA SIT group [(241.64±31.41) pg/ml] and Der f 1 SIT group [(321.94±41.07)pg/ml] was significantly lower than that of Der f 1 sensitization group [(520.62±43.77) pg/ml] and β-actin mRNA SIT group [(507.22±42.26) pg/ml](P<0.01). The number of eosinophils in Der f 1 mRNA SIT group [(1.33±0.44)×105/ml] and Der f 1 SIT group [(1.48±0.39)×105/ml] was also lower than that of Der f 1 sensitization group [(3.54±0.52)×105/ml] and β-actin mRNA SIT group [(2.98±0.53)×105/ml](P<0.01). The levels of IFN-γ and IL-13 in splenocyte culture supernatant showed that IFN-γ level in Der f 1 mRNA SIT group [(420.91±69.92) pg/ml] and Der f 1 SIT group [(334.92±43.72) pg/ml] was significantly higher than that of Der f 1 sensitization group[(123.75±15.48) pg/ml] and β-actin mRNA SIT group[(128.84±59.00) pg/ml] (P<0.01). However, IL-13 level of Der f 1 mRNA SIT group [(268.51±40.42) pg/ml] and Der f 1 SIT group [(285.26±62.21)pg/ml] was significantly lower than that of Der f 1 sensitization group [(613.89±51.54) pg/ml] and β-actin mRNA SIT group [(524.05±39.12) pg/ml](P<0.01). Compared with Der f 1 sensitization group [total IgE: (94.34±11.66) ng/ml, sIgE: (65.67±9.47) ng/ml, sIgG1: (75.18±9.52) ng/ml, sIgG2a: (2.81±1.17) ng/ml] and β-actin mRNA SIT group[total IgE: (86.48±10.26) ng/ml, sIgE: (62.36±8.35) ng/ml, sIgG1: (69.51±8.98) ng/ml, IgG2a: (1.06±0.11) ng/ml], the serum antibody levels of total IgE [(33.72±9.78) ng/ml], sIgE [(22.76±8.09) ng/ml], sIgG1 [(17.87±7.59) ng/ml] of Der f 1 mRNA SIT group decreased significantly(P<0.01), whereas the level of IgG2a [(7.74±0.88) ng/ml] increased(P<0.01). Compared with Der f 1 sensitization group, the asthmatic symptoms were relieved after immunization with Der f 1 mRNA for specific immunotherapy, including intact structure of respiratory and alveolar epithelial cells, decreased inflammatory cell infiltration, and similar to those in Der f 1 SIT group. However, the breakage and detachment of bronchial epithelial cells occurred in β-actin mRNA SIT group. Conclusion Der f 1 mRNA vaccine can correct Th1 and Th2 imbalance.

Key words:

Dermatophagoides farinaemso-ascii-font-family: Calibri, mso-ascii-theme-font: minor-latin, mso-fareast-font-family: 宋体, mso-fareast-theme-font: minor-fareast, mso-hansi-font-family: Calibri, mso-hansi-theme-font: minor-latin">;Allergenmso-ascii-font-family: Calibri, mso-ascii-theme-font: minor-latin, mso-fareast-font-family: 宋体, mso-fareast-theme-font: minor-fareast, mso-hansi-font-family: Calibri, mso-hansi-theme-font: minor-latin">;mRNA vaccinemso-ascii-font-family: Calibri, mso-ascii-theme-font: minor-latin, mso-fareast-font-family: 宋体, mso-fareast-theme-font: minor-fareast, mso-hansi-font-family: Calibri, mso-hansi-theme-font: minor-latin">;Specific immunotherapy