临床医学中国组织工程研究与临床康复 第 12 卷 第 3 期 2008–01–15 出版Journal of Clinical Rehabilitative Tissue Engineering Research January 15, 2008 Vol.12, No.3小鼠胚胎及人包皮成纤维细胞按比例制成混合饲养层上的人胚胎干细胞 生长状态★李 斌1,2，彭秋平2，卢伟英1,2，徐 雯1,2，金应霞2，黄元华1,2Growth state of human embryonic stem cells on mixed feeder layers with mouse embryonic fibroblasts and human foreskin fibroblasts at different ratiosLi Bin1,2, Peng Qiu-ping2, Lu Wei-ying1,2, Xu Wen1,2, Jin Ying-xia1, Huang Yuan-hua1,21AbstractAIM: The key of the human embryonic stem cell culture is to guarantee the totipotency and inhibit spontaneous differentiation. There are the problems in the traditional methods that human embryonic stem cells were cultured on the mouse embryonic fibroblasts or human foreskin fibroblasts as feeder layer. We aimed to solve the problems, observe growth state of human embryonic stem cells when it was cultured on the mixed feeder layers of different proportion. METHODS：Experiments were completed in Reproductive Medical Center of Hainan Medical College from April 2006 to July 2007. ①The foreskin was from the boy who was circumcised, provided by Department of Urinary Surgery of Hospital Affiliated to Hainan Medical College. Child guardian signed an informed consent of the treatment and experiment and the experiment was approved by the hospital medical ethics committee. Human embryonic stem cell line (HN-1) was isolated from human blastocysts and identified. Eleven clean fetal mice of 12.5-14.5 d were collected and the disposal of animal conformed to the animal ethics standards during the experiments. ②The fetal mice whose heads, limbs and internal organs were removed were repeatedly digested by the trypsin to obtain cells, then cells were cultured. Parts of the original cells were cryopreserved after confluence. It was the mouse embryonic fibroblast feeder layer that cells which were treated for 2.0-3.0 h with mitomycin C were cultured in the center plate coated by gelatin at 1×108 L-1. Isolation, culture and preparation of feeder layer of human foreskin fibroblast were the same as above. Mixed feeder layer was that cells which were mixed according to 1∶0，3∶1，1∶1，1∶3，0∶1 were cultured in the center plate coated by gelatin at 1×108 L-1. ③Growth states of human embryonic stem cells were observed in three different feeder layers and undifferentiated phenotypes were detected, including expression of alkaline phosphatase, and presence of OCT-4, Tert and cell marker (OCT-4). Without feeder layer, human embryonic stem cell differentiation was observed in vitro. RESULTS：①Comparison of human embryonic stem cell growth state on different feeder layers: Colonies of human embryonic stem cells on the mouse embryonic fibroblast feeder layer and human foreskin fibroblast feeder layer was both flat and thin, but those on the mixed cells feeder layer were full and thick. The clonal morphology of the mixed feeder layer, overall, was significantly better than others. ②Comparison of human embryonic stem cell growth state on the mixed feeder layers prepared by different ratios: When mouse embryonic fibroblasts and human foreskin fibroblasts were mixed at a ratio of 1∶1 human embryonic stem cells accumulated significantly and cloning edge was clear, obvious and full. No significant changes were found at 1∶3. It was significantly better than others. ③Detection of human embryonic stem cell undifferented phenotypes on mixed feeder layer: Expression of alkaline phosphatase and OCT-4 antigen were strongly positive. Specific bands of OCT-4 and telomerase mRNA appeared respectively on 200-300 bp and 300-400 bp. ④Differentiation experiment in vitro: Human embryonic stem cells on mixed feeder layer was able to form embryoid bodies and differentiate into a variety of cells. CONCLUSION： ①Comparison with conventional feeder layers prepared by mouse embryonic fibroblasts or human foreskin fibroblasts, the mixed cells feeder layer may be better suitable for human embryonic stem cell culture in vitro and obtain better human embryonic stem cell clonal morphology. ②The feeder layer mixed at a ratio of 1∶1 can get better effect. Li B, Peng QP, Lu WY, Xu W, Jin YX, Huang YH.Growth state of human embryonic stem cells on mixed feeder layers with mouse embryonic fibroblasts and human foreskin fibroblasts at different ratios.Zhongguo Zuzhi Gongcheng Yanjiu yu Linchuang Kangfu 2008;12 (3):424-428(China) [/zglckf/ejournal/upfiles/08-3/3k-424(ps).pdf] 摘要目的：人胚胎干细胞传代培养的关键是抑制其自发分化、保证细胞的全能性。