中文摘要：

背景：Treg细胞对炎症性肠病（IBD）具有免疫保护作用，淋巴细胞功能相关抗原-1（LFA．1）参与了IBD时Treg细胞的分化和迁移。目的：探讨LFA-1调节Treg细胞对IBD疗效的影响。方法：将LFA-1基因缺失小鼠和相同遗传背景野生型小鼠各20只分别随机分为炎症组和治疗组。小鼠饮用2．5％DSS溶液诱导结肠炎模型，治疗组小鼠通过尾静脉回输体外诱导的Treg细胞。观察小鼠一般情况和结肠组织学表现，流式细胞术检测外周血、脾脏、肠系膜淋巴结中Treg细胞比例，ELISA法检测血清TGF-p1、IL-10、IL-17A、IFN-1水平，实时PCR检测结肠组织TGF-p1、IL-10mRNA表达。结果：LFA-1缺失治疗组结肠组织学评分与野生型治疗组无明显差异。LFA-1缺失治疗组肠系膜淋巴结Treg细胞比例显著高于相应炎症组（P〈0。05）；IJFA-1缺失治疗组外周血、脾脏、肠系膜淋巴结Treg细胞比例显著低于野生型治疗组（P〈0．05）。与相应炎症组相比，野生型和LFA-1缺失治疗组血清TGF—B1、IL-10以及结肠组织TGF—p1mRNA表达显著升高（P〈0．05），IL-17A、IFN-1以及IL-10mRNA表达显著降低（P〈0．05）。野生型治疗组血清TGF-p1、IL-10以及TGF·B1、IL-10 mRNA表达显著高于LFA一1缺失治疗组（P〈0．05），1L-17A、IFN-Y显著降低（P〈0．05）。结论：LFA-1参与了Treg细胞功能的调控，能促进Treg细胞分泌抗炎因子TGF—Bl、IL-10等。Treg细胞治疗LFA-1缺失结肠炎小鼠的疗效低于野生型小鼠，可能与Treg细胞功能和细胞因子的分泌受到抑制相关。

英文摘要：

Background： Treg cells play an immunoprotective role in inflammatory bowel disease （IBD）. Lymphocyte function- associated antigen-1 （ LFA-1 ） is involved in the differentiation and migration of Treg cells in IBD. Aims： To investigate the efficacy of LFA-1 on IBD by regulating Treg cells. Methods ： Twenty LFA-1 gene knockout （ LFA-1 -/- ） mice and 20 wild type mice with same genetic background were randomly divided into colitis group and treatment group, respectively. Colitis model was induced by drinking 2.5% DSS solution. Mice in treatment group were injected with Treg cells induced in vitro through the tail vein. General condition and colon histology were examined. Percentages of Treg cells in peripheral blood, spleen and mesenteric lymph node were detected by flow cytometry. Serum levels of TGF-β1, IL-10, IL-17A and IFN-y were measured by ELISA. mRNA expressions of TGF-i31 and IL-IO in colon tissue were detected by real time PCR. Results： No significant difference in colon histological score was found between LFA-1 -/- treatment group and wild type treatment group. Percentage of Treg cells in mesenteric lymph node in LFA-1 -/- treatment group was significantly higher than that in LFA-1-/- colitis group （P 〈 0.05 ）. Percentages of Treg cells in peripheral blood, spleen and mesenteric lymph node in LFA-1 -/- treatment group were significantly lower than those in wild type treatment group （ P 〈 0.05 ）. Compared with corresponding colitis group, serum levels of TGF-β1, IL-10 and colon tissue TGF-β1 mRNA expression in wild type treatment group and LFA-1 -/- treatment group were significantly increased （P 〈 0.05）, levels of IL-17A, IFN- and expression of IL-10 mRNA were significantly decreased （P 〈 0.05 ）. Serum levels of TGF-β1, IL-10 and expressions of TGF-β1, IL-10 mRNA in wild type treatment group were significantly increased when compared with LFA-1 x - treatment group （ P 〈 0.05 ）, levels of IL-17A and IFN-γ were significantly decreased （ P 〈 0.05 ?