rhG-CSF对小鼠骨髓间充质干细胞的动员作用

为了研究rhG-CSF体内应用对小鼠骨髓间充质干细胞（MSC）的动员作用,将30只小鼠随机分为2组：rhG-CSF组和对照组,分别给予皮下注射rhG-CSF80μg/（kg.d）和等量生理盐水,连续5天,在最后1次注射后分别于6,12和168小时取小鼠骨髓和外周血,以1×10^6单个核细胞（MNC）接种于12孔培养板14天,对形成的成纤维细胞集落（CFU-F）进行计数,用胰蛋白酶消化后应用流式细胞术测定表面抗原并进行成脂,成骨诱导。结果表明：rhG-CSF组骨髓形成的CFU-F数均较对照组明显增加（p〈0.01）。6小时取材较12小时,168小时取材形成的CFU-F数目多（p〈0.01）,12小时与168小时CFU-F差异无统计学意义。流式细胞术检测骨髓CFU-F显示CD34^-、CD133^-、CD90^＋、CD105^＋,骨髓CFU-F具有成脂、成骨分化的能力。rhG-CSF组6小时取材外周血具有类似骨髓的CFU-F,出现的频率为（0.50±0.11）×10^-6,与对照组比较差异有显著性（p〈0.05）。结论：rhG-CSF可使小鼠骨髓间充质干细胞增殖加速,但时间短暂,其高峰在rhG-CSF应用5天后的6小时内。rhG-CSF对小鼠间充质干细胞也有动员能力,但作用较弱。

Effects of rhG-CSF on Mobilization of Mouse Mesenchymal Stem Cells

To evaluate the effects of rhG-CSF on mobilization of mesenchymal stem cells (MSCs) of mouse bone marrow at different time point, thirty mice were randomly divided into rhG-CSF treatment group and control group. The mice were subcutaneously injected with rhG-CSF in a dose of 80 microg/kg or saline for 5 days. The bone marrow and peripheral blood were obtained at time points of 6, 12, 168 hours after final injection of rhG-CSF or saline. Bone marrow mononuclear cells (BMMNCs) were seeded at density of 1 x 10(6) MNCs onto 12-well plate for culture expansion in DMEM supplemented with 10% FBS, and the number of colony forming unit - fibroblast (CFU-F) was counted after 14 days. The cells were collected by trypsinization and the surface antigens CD34, CD133, CD90 and CD105 were analyzed by flow cytometry. The multi-differentiation of MSCs were done in the culture condition of induced-adipocyte and osteocyte. Peripheral blood MNCs examination was same as the bone marrow. The results indicated that the number of CFU-F of bone marrow in rhG-CSF group was more than that in control group (p < 0.01), the number of CFU-F in rhG-CSF group at 6 hours was more than that at 12 hours and 168 hours, respectively (p < 0.01). There was no obvious difference between CFU-F at 12 hours and at 168 hours (p > 0.05). MSCs were positive for CD90, CD105 and negative for CD34 and CD133. MSCs were found to differentiate into adipocyte and osteocyte in vitro. The CFU-F of PBMNCs obtained and cultured in vitro in the same culture conditions could be observed after the rhG-CSF injection at 6 hours, but cloning efficiency was (0.50 +/- 0.11) x 10(-6) MNCs and showed statistical difference as compared with control. It is concluded that rhG-CSF to mobilize hemopoietic stem cells can be used to induce mouse MSCs in vivo expansion, which showed the peak value within 6 hours after final injection of rhG-CSF. rhG-CSF have the mini-mobilization effect on murine MSCs derived from bone marrow.