【摘要】 本研究检测人胚胎主动脉-性腺-中肾(AGM)区基质细胞表达的造血生长因子,为探讨AGM区基质细胞在胚胎造血发生中的作用及其造血支持作用提供基础资料。采用RT-PCR方法在mRNA水平分析IL-6、SCF、Flt3-L、OSM、IL-3、TPO、M-CSF、LIF等因子在人AGM区基质细胞(hAGMS1-S5)的表达情况,应用ELISA法测定IL-6、SCF、Flt3-L在hAGMS1-S5细胞培养上清液中的分泌水平,并将脐血CD34+细胞与hAGMS1-S5饲养层细胞共培养14天后行造血细胞集落培养以进一步检测人AGM区基质细胞的造血支持作用。结果表明:hAGMS1-S5均表达IL-6、SCF、Flt3-L、OSM等造血生长因子mRNA,不表达IL-3、TPO、M-CSF、LIF等因子mRNA。在hAGMS1-S5细胞培养上清液中可测得分泌的SCF、Flt3-L、IL-6等因子,hAGMS1-S5组间比较各因子水平无显著性差异(P>0.05)。集落培养结果表明,hAGMS1-S5对CFU-GM、BFU-E、CFU-Mix均有不同程度的扩增作用,hAGMS1-S5的造血支持作用组间比较亦显示有显著性差异(P<0.05),其中hAGMS3、S4优于S1、S2及S5。结论:人AGM区基质细胞表达SCF、Flt3-L、IL-6、OSM等多种造血生长因子,这可能与AGM区基质细胞支持造血细胞原始发生和体外维持造血干细胞功能相关。更多还原

【Abstract】 his study was aimed to investigate the hematopoietic growth factors expressed in human aorta-gonad-mesonephros (AGM)-derived stromal cells in vitro in order to provide the basic data for elucidating the role of AGM -derived-stromal cells in embryo-hematopoiesis and its hematopoietic suppoitive effect. RT-PCR was used to analyze the expression of IL-6, SCF, Flt3-L, oncostatin M(OSM), IL-3, TPO, M-CSF and LIF in human aorta-gonad- mesonephros-derived stromal cells (hAGMS1-S5) at mRNA level. IL-6, SCF and Flt3-L levels were detected in the supernatant of hAGMS1-S5 stromal cells by ELISA assay. Umbilical cord blood CD34~+ cells were cocultured with hAGMS1-S5 feeder cells , and hematopoietic cells were collected at day 14 for colony analysis in methylcellulose semisolid medium. The results showed that human aorta-gonad-mesonephros-derived stromal cells S1-S5 expressed IL-6, SCF, Flt3-L and OSM mRNA, but did not express IL-3, TPO, M-CSF and LIF mRNA. In the supernatant of hAGMS1-S5 cells, IL-6, SCF and Flt3-L could be detected by ELISA assay at different levels, while there was no significant difference between groups of hAGMS1-S5 (P>0.05). When cocultured with umbilical cord blood CD34~+cells, hAGMS1-S5 could support the expansion of CFU-GM, BFU-E, and CFU-Mix. The supportive effects of hAGM S1-S5 were significantly different (P<0.05), hAGM S3 and S4 were better than hAGM S1, S2, and S5. It is concluded that detection of hematopoietic growth factors expressed in human aorta-gonad-mesonephros-derived stromal cells provided a solid foundation to elucidate the mechanism of hematopoiesis and the hematopoietic supportive effect of these stromal cells.更多还原