Objective: To investigate the effect of bone marrow mononuclear cell transplantation on the expression of miRNA-21 and miRNA-155 in mice with ulcerative colitis(UC). Methods: Healthy and clean KM mice aged 6-8 weeks were randomly divided into transplantation group, model group and normal control group with 15 mice in each group. In the transplantation group and model group, dextran sodium sulfate (DSS) was used to establish the model for 24 h. The mice in the transplantation group were injected with 0.4 ml of 4 ', 6-diaminol-2-phenylindole (DAPI) -labeled P3-BM-MNCs cell suspension (3.2×10(6) cells/ml), and the mice in the model group and the normal control group were injected with 0.4 ml phosphate buffer (PBS).UC disease activity index (DAI) was used to test the general condition of mice; HE staining was used to observe the pathological changes of colon tissue; Real-time quantitative PCR was used to detect the expression of miRNA-21 and miRNA-155 mRNA. Results: DAI scores of normal control group, model group and transplantation group were 0 (0,1), 3.1 (2.8,3.3) and 2.7 (2.4,3.1),respectively. Compared with normal control group, the DAI score of model group and transplantation group was higher (P<0.05), and the DAI score of transplantation group was lower than that of model group (P<0.05). The gross scores of tissue injury in normal control group, model group and transplantation group were 0 (0, 1), 3 (3, 4) and 1 (1, 2), respectively,and the pathological scores of tissue injury were 0 (0, 1), 16 (12, 16) and 6 (6, 8), respectively,compared with the normal control group. The tissue injury score of the model group and the transplantation group was higher (P<0.05), and the tissue injury score of the transplantation group was lower than that of the model group (P<0.05). The expression levels of miRNA-21 mRNA in normal control group, model group and transplantation group were 0.87±0.15, 2.38±0.29 and 1.59±0.32, respectively, and the expression levels of miRNA-155 mRNA were 1.87±0.46, 7.38±1.97 and 3.92±0.84, respectively, compared with the normal control group, the expression of miRNA-21 and miRNA-155 mRNA in the model group and transplantation group was higher (P<0.01), the expression of miRNA-21 and miRNA-155 mRNA in the transplantation group was lower than that of the model group (P<0.05). Conclusion: Bone marrow mononuclear cell transplantation can improve the histopathological and DAI scores of mice with UC, which may be related to the down-regulation of miRNA-21 and miRNA-155 mRNA expression.
目的： 探讨骨髓单个核细胞移植对溃疡性结肠炎(UC)模型小鼠微小RNA（miRNA）-21和miRNA-155表达影响。 方法： 健康清洁级6~8周龄KM小鼠数字随机分为移植组、模型组和正常对照组，每组15只。移植组和模型组用葡聚糖硫酸钠（DSS）方法造模24 h，移植组小鼠经尾静脉注入0.4 ml 4′,6-二脒基-2-苯基吲哚（DAPI）标记的P3-BM-MNCs细胞悬液（3.2×10(6)个/ml）；模型组及正常对照组大鼠注入0.4 ml磷酸盐缓冲液（PBS）。采用UC疾病活动指数（DAI）对小鼠的一般情况进行评分；采用HE染色观察小鼠结肠组织病理变化；采用实时定量PCR检测miRNA-21和miRNA-155信使RNA（mRNA）表达。 结果： 正常对照组、模型组和移植组的DAI评分分别为0(0,1)、3.1(2.8,3.3）和2.7(2.4,3.1)，与正常对照组比较，模型组和移植组小鼠DAI评分较高（P<0.05）；与模型组比较，移植组小鼠DAI评分较低（P<0.05）。正常对照组、模型组和移植组的组织损伤大体评分为0（0，1）、3（3，4）和1（1，2），组织损伤病理评分分别为0（0，1）、16（12，16）和6（6，8），与正常对照组比较，模型组和移植组小鼠组织损伤评分较高（P<0.05）；与模型组比较，移植组小鼠组织损伤评分较低（P<0.05）。正常对照组、模型组和移植组的miRNA-21 mRNA表达水平分别为0.87±0.15、2.38±0.29和1.59±0.32，miRNA-155 mRNA表达水平分别为1.87±0.46、7.38±1.97和3.92±0.84，与正常对照组比较，模型组和移植组小鼠miRNA-21和miRNA-155 mRNA表达较高（P<0.01）；与模型组比较，移植组小鼠miRNA-21和miRNA-155 mRNA表达较低（P<0.05）。 结论： 骨髓单个核细胞移植可改善UC模型小鼠组织病理学评分和DAI评分，其机制可能与下调miRNA-21和miRNA-155 mRNA表达相关。.
Keywords: MicroRNA-155; MicroRNA-21; Mononuclear cell; Ulcerative colitis.