一种新的培养人胚胎干细胞的包被基质

Development of a new coating substrate for human embryonic stem cell culture

目的：开发一种新的培养人胚胎干细胞（ hESCs）的包被基质，使hESCs的培养更加简便。方法用甲醇固定的小鼠胚胎成纤维细胞（ MEF）作为包被基质，人胚胎干细胞系X-01在该基质上生长，每隔5～6 d传代一次，培养10代后，对人胚胎干细胞特性进行检测，包括细胞形态、碱性磷酸酶染色、相关多能性基因的表达和分化能力。结果 hESCs在新的基质上生长良好，经10次传代后仍能保持典型的hESCs克隆形态。碱性磷酸酶染色阳性，免疫荧光染色 Oct4、SSEA4、Tra-1-60为阳性，体外分化可形成拟胚体。结论此种固定的基质可以大量制备，长期保存，并可以长期维持hESCs的未分化状态，为人胚胎干细胞的体外扩增探索出了一个新的途径。

Objective To reduce the animal component contamination for human embryonic stem cells （ hESCs ） and to simplify hESCs culture process , we develop a new coating substrate which can support the hESCs growth without dif -ferentiation, and is easy to store and use. Methods Mouse embryonic fibroblasts（MEF）were fixed on the surface of plate by methanol.hESCs were cultured on this new substrate and were passaged every 5 to 6 days.After 10 passages, we checked the cell morphology , alkaline phosphatase expression , embryonic specific markers and the differentiation ability in vitro.Results After 10 passages , the hESCs grew well on this new substrate and maintained the typical hESCs morpholo -gy.Alkaline phosphatase staining was positive .Immunofluorescence staining showed that the expressions of Oct 4, SSEA4, Tra-1-60 were positive .The cells formed embryoid body in vitro .Conclusions This methanol-fixed MEF substrate can support the growth of undifferentiated hESCs .The coating material can be produced in large scale and stored for a long time.It provides a new and relatively easy way to amplify hESCs .