首页> 中文期刊> 《中国病理生理杂志》 >H.polygyrus感染对T细胞介导的炎症性肠病的影响及其作用机制研究

H.polygyrus感染对T细胞介导的炎症性肠病的影响及其作用机制研究

         

摘要

目的:研究多形螺旋线虫(H.polygyrus)感染对CD4+辅助性T细胞介导的小鼠炎症性肠病(IBD)的影响及其作用机制.方法:用卵清蛋白(OVA)特异性的CD4+辅助性T细胞转入重度联合免疫缺陷(SCID)小鼠中制作IBD模型.将IBD小鼠感染H.polygyrus,14 d后处死小鼠,观察结肠的组织学变化,用ELISA法和流式细胞术检测肠系膜淋巴结中干扰素-γ(IFN-γ)和白细胞介素-4(IL-4)的表达.另外,对感染H.polygyrus的IBD小鼠注射IL-4单克隆抗体以阻断IL-4的分泌,9 d后处死小鼠,观察相同的指标.结果:与无感染组相比,感染H.polygyrus的IBD小鼠结肠病损明显加重,肠系膜淋巴结中IL-4水平明显增高,IFN-γ水平明显降低(均P<0.05).在IL-4阻断实验中,与无IL-4阻断组相比,IL-4阻断组结肠病损明显减轻,IL-4水平明显降低,IFN-γ水平明显增高(均P<0.05).结论:H.polygyrus感染在CD4+ T细胞介导的IBD模型早期加重了炎症反应,其作用可能是通过诱导Th2细胞因子的分泌、抑制Th1细胞因子的分泌来实现的,提示用蠕虫治疗IBD时需谨慎.%AIM: To investigate the effect and mechanism of Heligmosomoides polygyrus ( H.polygyrus ) infection in mouse inflammatory bowel disease ( IBD ) mediated by CD4 + helper T - cells.METHODS: Ovalbumin ( OVA ) -specific CD4+ helper T - cells were transferred into SCID ( severe combined immunodeficiency ) mice to establish an IBD model.The IBD mice were infected by H.polygyrus and sacrificed 14 days later.The histological changes of the colon were observed, and the expression of interferon - gamma ( IFN - γ ) and interleukin - 4 ( IL - 4 ) in mesenteric lymph nodes was detected by ELISA and flow cytometry.Additionally, IL - 4 monoclonal antibody was intraperitoneally injected into the H.polygyrus - infected IBD mice to block the secretion of IL - 4.The IL - 4 - blocking IBD mice were sacrificed 9 days later and the above indexes were also determined.RESULTS: Compared with the non - infection group, the H.polygyrus - infected IBD mice had more severe colonic lesions, higher level of IL - 4 and lower level of IFN - γ in mesenteric lymph nodes ( all P < 0.05 ).Compared with the non - blocking group, the H.polygyrus - infected IBD mice with IL - 4 blockage had less colonic lesions, lower IL -4 level and higher IFN - γ level ( all P <0.05 ).CONCLUSION: H.polygyrus infection in CD4+ T - cell - mediated IBD model promotes inflammation in the early stage probably by inducing the secretion of Th2 cytokine and inhibiting the secretion of Th1 cytokine.The finding suggests that using worms for treatment of IBD needs to be cautious.

著录项

  • 来源
    《中国病理生理杂志》 |2011年第4期|711-717|共7页
  • 作者单位

    中山大学附属第六医院结直肠外科,广东,广州,510655;

    哈佛大学医学院麻省总医院黏膜免疫实验室,美国马萨诸塞州,查尔斯镇,02129;

    广州医学院附属广州市第一人民医院,广东,广州,510180;

    中山大学附属第六医院结直肠外科,广东,广州,510655;

    中山大学附属第六医院结直肠外科,广东,广州,510655;

    中山大学附属第六医院结直肠外科,广东,广州,510655;

    中山大学附属第六医院结直肠外科,广东,广州,510655;

    中山大学附属第六医院结直肠外科,广东,广州,510655;

    中山大学附属第六医院结直肠外科,广东,广州,510655;

    哈佛大学医学院麻省总医院黏膜免疫实验室,美国马萨诸塞州,查尔斯镇,02129;

    哈佛大学医学院麻省总医院黏膜免疫实验室,美国马萨诸塞州,查尔斯镇,02129;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 病理生理学;
  • 关键词

    炎性肠疾病; 多形螺旋线虫; T淋巴细胞,辅助性;

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