CpG寡脱氧核苷酸促进小鼠清除体内结核分枝杆菌的机制  

A study on the mechanisms of mycobacterial clearance induced by CpG-oligodeoxynucleotides in mice

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作  者:任涛[1] 梁永杰[1] 蔡映云[2] 李传友[3] 梅建 袁正宏[4] 陶梦非[1] 田苗[3] 赵冰[3] 

机构地区:[1]同济大学附属东方医院呼吸科,上海200120 [2]复旦大学呼吸疾病研究所 [3]北京市结核病胸部肿瘤研究所 [4]复旦大学医学分子病毒学教育部重点实验室 [5]上海市疾病预防与控制中心

出  处:《中华结核和呼吸杂志》2008年第1期46-50,共5页Chinese Journal of Tuberculosis and Respiratory Diseases

摘  要:目的探讨CpG寡脱氧核苷酸(CpG-ODN)增强小鼠体内结核分枝杆菌清除能力的可能机制。方法将雌性BALB/c小鼠随机分为免疫组36只和对照组24只,并分别腹腔注射CpG-ODN30μg(溶于200Ixl生理盐水)和200山生理盐水。2周后每只小鼠经尾静脉注射结核分枝杆菌H37Rv1×10^6CFU。感染后3周和4周每组分别处死12只小鼠,免疫组小鼠饲养至感染后6周处死。肺和脾组织进行菌落计数,观察肺和脾组织的病理学变化。用实时定量聚合酶链反应方法检测肺和脾组织γ-干扰素、白细胞介素(IL)-4、IL-10、IL-12、IL-18和诱导型-氧化氮合酶(iNOS)mRNA表达的相对含量。组间比较采用t检验。结果感染后3周,免疫组小鼠的肺和脾组织经培养后无结核分枝杆菌生长。感染后4周,免疫组小鼠的肺和脾组织培养后有结核分枝杆菌生长,但明显少于对照组;肺组织中IL-18、γ-干扰素和iNOS的mRNA表达的相对含量分别为(3.6±0.5、0.32±0.14和23.2±4.7),均明显高于对照组的(1.6±1.1、0.20±0.10和16.24±5.1),IL-12p40mRNA表达的相对含量(5.7±0.6)明显低于对照组(14.5±1.9),IL-4和IL-10mRNA表达的相对含量(0.30±0.09和0.28±0.05)与对照组(0.26±0.05和0.29±0.08)无明显差别;脾组织中IL.18、γ-干扰素和iNOSmRNA表达的相对含量(5.5±1.3、0.52±0.07和9.14-1.8)明显高于对照组(0.8±0.4、0.21±0.06和6.0±1.4),IL-12p40、IL4和IL-10mRNA表达的相对含量(2.1±0.3、0.23±0.10和0.10±0.04)明显低于对照组(5.14±0.4、1.21±0.26和0.57±0.13)。与感染后4周比较,免疫组小鼠感染后6周,肺组织γ-干扰素mRNA表达的相对含量(0.95±0.27)明显增高,IL-18、IL-4和IL-10mRNA表达的相对含量(3.514±0.86、0.45±0.35和0.24±0.21)无明显变化,IL-12p40和iNOSmRNA表达的相对含量(1.72±1.41和1.1±0.5)明显降低;脾组织IL-12p40和IL-18mRNA表达的相对含量(0.08±0.Objective To investigate the possible mechanisms of mycobacterial clearance induced by CpG-oligodeoxynucleotides (CpG-ODN)in mice. Methods Eight-week-old female BALB/c mice were treated with intraperitoneal CpG-ODN (30 μg), while the control mice with normal saline. After 2 weeks, the control mice and the CpG-treated mice were infected with Mycobacterium tuberculosis ( 1 × 10^6 colonyforming units, H37 Rv strain) through the tail vein. At 3 weeks,4 weeks and 6 weeks after mycobacterial infection, the lung and the spleen tissues were examined for histopathological changes. Real time-PCR was performed to measure the messenger RNA (mRNA) of interleukin (IL)-12, IL-18, interferon (IFN)-γ, IL- 4,IL-10 and inducible nitric oxide synthase (iNOS) in the tissues. The homogenates of lungs and spleens were cultured, and the colonies were counted after a 4 weeks incubation period at 37℃. Results At 3 weeks and 4 weeks of mycobacterial infection, CpG-ODN-pretreated mice showed less mycobacterial burden in the lungs and the spleens than that in the control mice [ (0 ±0) vs 106 CFU/g vs (32 ± 11 ) × 10^6 CFU/g, (0 ±0) × 106 CFU/g vs (10 ±) × 10^6 CFU/g; (26 ±) × 10^6 CFU/g vs (56 ±) × 106 CFU/g, (4 ±) × 10^6 CFU/g vs (27 ±8) × 10^6 CFU/g]. At 4 weeks of mycobacterial infection, CpG-ODN-pretreated mice displayed increased levels of IL-18 mRNA, IFN-18 mRNA, iNOS mRNA [ (3.6 ±. 5, 1.6 ±1.1, 0. 32 ±0. 14) vs (0. 20 ± 10, 23.17 ±. 72, 16. 18 ±.09) ], and decreased level of IL-12p40 mRNA (5. 66 ±0. 64 vs 14.54 ±1.89) , but there was no difference in the levels of IL-4 mRNA and IL-10 mRNA in the lungs between CpG-ODN-pretreated mice and the control mice [ ( 0. 30 ± 0. 09 vs 0. 26 ±0. 05 ), ( 0. 28 ±0. 05 vs 0. 29 ±0. 08 ) ]. CpG-ODN-pretreated mice displayed increased levels of IL-18 mRNA, IFN-18 mRNA, iNOS mRNA [ (5. 54 ±1.29 vs 0. 79 ±. 36), (0. 52 ±0. 07 vs 0. 21 ±0.06), (9. 07 ±1.81 vs 5.97 ±1.44) ], an

关 键 词:分枝杆菌 结核 寡脱氧核糖核苷酸类 TOLL样受体9 

分 类 号:R686[医药卫生—骨科学]

 

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