中文摘要：

目的探讨干细胞因子（SCF）对脐静脉内皮细胞（HUVEC）增殖、迁移、管状形成能力的影响，以及对CD133^＋细胞的趋化效应。方法应用MTF及CCK-8增殖分析法检测HUVEC在不同细胞因子[空白试剂、SCF、血管内皮生长因子（VEGF）、抗人SCF、人IgG]条件下增殖能力的差异性；采用细胞划痕法与Matrigel体外三维成型法分别检测内皮细胞的增殖、迁移和管状形成能力；并应用Tran—swell技术检测不同细胞因子诱导的CD133^＋细胞体外趋化效应。结果MTT及CCK-8增殖分析结果显示SCF无HUVEC增殖刺激活性；SCF可显著提升HUVEC迁移能力；SCF呈剂量依赖性增强HUVEC管状形成能力，在适宜浓度SCF（100ng／m1）作用下，HUVEC完整小管形成数量[（30．0±3．4）／10^5HUVEC]显著高于空白试剂组[（5．04-2．6）／10^5HUVEC，P〈0．01]；SCF可高效诱导CD133^＋细胞体外趋化，SCF组[（118．0±6．5）／10^4CD133^＋细胞]Transwell小室跨膜迁移细胞数显著高于空白试剂组[（47．0±4．7）／10^4CD133^＋细胞，P〈0．01]。结论SCF可显著增强HUVEC的迁移及管状形成能力，并有效诱导CD133^＋细胞体外趋化，提示SCF／c—kit信号转导在内皮细胞及其祖细胞的血管新生与血管发生过程中可能发挥重要作用。

英文摘要：

Objective To explore the effects of stem cell factor （SCF） on proliferation, transmigration, capillary tube formation of human umbilical vein endothelial ceils （HUVEC） and on the chemotaxis of CD133^＋ cells. Methods In the presence of blank control, SCF, vascular endothelial growth factor （ VEGF）, anti-human SCF （anti-SCF） or human IgG, the difference in proliferation capacity of HUVEC was analyzed by MTY and CCK-8 methods, and wound scratch assay and three-diamensional in vitro Matrigel assay were used for transmigration and capillary tube formation of HUVEC, respectively. In addition, the chemotaxis of CD133^＋ cells sorted from human umbilical cord blood by flow cytometry was investigated by Transwell migration assay. Results SCF didn＇ t improve the proliferative capacity of HUVEC, but significantly enhanced the transmigration capacity, and increased capillary tube formation in a dose-dependent manner. The number of intact tubules [ （30.0± 3.4）/105 HUYEC ] formed by HUVECs in the presence of the optimal concentration of SCF （ 100 ng/ml） was remarkably higher than that in blank control group [ （5.0 ± 2.6）/105 HUVEC,P 〈 0.011- SCF also significantly induced a ehemotaetie response of CD133 ^＋ cells, the transmembrane migration cell number into Transwell lower chamber was significantly higher in SCF group [ （ 118.0±6.5）/104 CD133 ^＋cells] than in blank control group [ （47.0 ±4.7）/104 CD133 ^＋eells,P 〈 0.01 ]. Conclusions SCF significantly promotes the transmigration and capillary tube formation of HUVEC, and induces a ehemotaetic response of CD133 ^＋cells. SCF/c-kit signaling possibly plays a critical role in regulating angio- genesis of vascular endothelial cells and vaseulogenesis of endothelial progenitor cells.