【摘要】 目的:观察MRL/lpr狼疮鼠骨髓的血液生成情况及骨髓微环境中骨髓间充质干细胞(bone marrow masenchymal stem cell,BMMSC)表面的粘附分子N-钙粘附蛋白(N-cadherin)的表达水平。方法:采集MRL/lpr狼疮鼠外周血进行血细胞计数;流式细胞术检测和分析狼疮鼠骨髓各系血细胞的比例;甲基纤维素半固体集落形成试验(CFU)检测狼疮鼠骨髓中CFU-pre-B、BFU-E、CFU-GM数目。分离培养狼疮鼠的BMMSC,Western blot检测其N-cadherin的表达。最后,分别用BMP/Smad通路的激动剂BMP-2和抑制剂Noggin处理BMMSC,尔后观察狼疮鼠BMMSC的N-cadherin的表达变化。结果:与C57BL/6小鼠比较,狼疮鼠的血红蛋白、红细胞计数和血细胞比容显著降低(P<0.01;n=7);狼疮鼠骨髓中B220+细胞比例和CFU-pre-B数目均明显下降(P<0.05;n=5)。狼疮鼠BMMSC的粘附分子N-cadherin的表达水平明显高于对照组(P<0.05;n=3)。BMP-2处理狼疮鼠BMMSC后N-cadherin的水平下降,而在Noggin处理后N-cadherin表达则上调(P<0.05;n=3)。结论:MRL/lpr狼疮小鼠骨髓中B淋巴细胞生成障碍。此外,小鼠骨髓微环境中BMMSC表面的粘附分子N-cadherin水平升高,其可能参与了MRL/lpr狼疮小鼠的骨髓血液生成异常。更多还原

【Abstract】 Objective: To investigate the hematological changes in MRL/lpr lupus mice and detect N-cadherin expression in their bone marrow mesenchymal stem cell(BMMSC). Methods: Peripheral blood cell count was analyzed.The ratio of each lineage in bone marrow was analyzed by flow cytometry. Bone marrow CFU-pre-B, BFU-E and CFUGM were detected by colony formation assay. Expression of N-cadherin in BMMSC was analyzed by Western blot before and after treatment with the BMP/Smad pathway aganist BMP-2 and inhibitor Noggin. Results: Hemoglobin, red blood cell count and hematocrit decreased in lupus mice, compared with C57 BL/6 mice. The ratio of B220+ lymphocyte and the number of CFU-pre-B in bone marrow of lupus mice decreased. Expression of N-cadherin in BMMSC of lupus mice was higher than that in the control group. Expression of N-cadherin decreased in BMP-2-treated BMMSC and increased after Noggin treatment. Conclusion: Hematological changes in lupus mice include anemia and impairment of bone marrow B cell production. The expression of N-cadherin in BMMSC of lupus mice increases which maybe involved in abnormal hemogenesis in MRI/Ipr lupus mice.更多还原