C57BL/6小鼠来源的胚胎干细胞建系及体外定向造血分化的研究

Investigation of In Vitro Hematopoietic Differentiation of Embryonic Stem Cell Line Established from C57BL/6 Mice

哺乳动物的胚胎造血表现为时间和空间的连续变化。既往研究表明 ,12 9小鼠来源的胚胎干细胞系(embryonicstemcells,ES细胞 )的体外分化能在一定程度上模拟胚胎造血。为研究C5 7BL 6小鼠来源的ES细胞系体外定向造血细胞分化的特点 ,分离C5 7BL 6小鼠 3.5天囊胚的内细胞团建立ES细胞系并采用常规方法鉴定 ,应用体外二步分化法形成拟胚体并进行集落培养 ,细胞化学染色和RT PCR鉴定造血前体细胞。结果表明 :所建ES细胞系MES 1符合建系标准 ,其体外分化后可在不同阶段的拟胚体中发现多种造血前体细胞的有序出现 ,包括原始红系前体细胞 ,永久红系前体细胞 ,混合集落形成细胞和粒单系集落形成细胞。RT PCR分析显示 ,拟胚体表达多种造血特异性的转录因子和造血标记。结论 :自C5 7BL 6小鼠建立的ES细胞系MES

Embryonic hematopoiesis in mammals is characterized by successive temporal and spatial changes. Previous investigations indicate that in vitro differentiation of embryonic stem cells (ES cells) derived from 129 mice can mimic embryonic hematopoiesis to some extent. To investigate the in vitro hematopoietic differentiation capacity of ES cells derived from C57BL/6 mice, the authors initially established the murine ES cell line with standard identification methods employed. Next, two step culture system was utilized for embryoid bodies formation and the appearance of different hematopoietic precursors was confirmed by CFC assay, cellular chemical staining as well as RT PCR. The results demonstrated that the ES cell line MES 1 fulfilled the criteria of ES cell line and its progeny after in vitro differentiation included primitive and definitive erythrocyte precursors, mixed colony forming cells and granulocyte/macrophage colony forming cells. RT PCR analysis revealed the molecular consistence of transcription factors and hematopoietic markers with cellular event. In conclusion, MES 1 established from C57BL/6 mice was able to differentiate in vitro to a variety of hematopoietic precursors, thus could partly recapitulate embryonic hematopoiesis.