摘要
背景:极小胚胎样干细胞是近年来发现的一种具有类似胚胎干细胞生物学特性的非造血干细胞,但对其体外培养扩增的方法报道极少。有研究推测,人胚胎成纤维细胞能为人骨髓极小胚胎样干细胞体外培养扩增提供良好的微环境。目的:从人胚胎躯干中分离、培养人胚胎成纤维细胞,制备人胚胎成纤维细胞饲养层用于人骨髓极小胚胎样干细胞的培养。方法:利用胰酶消化法从孕5-9周龄人胚胎躯干中分离培养人胚胎成纤维细胞。制作饲养层,使用不同浓度丝裂霉素C处理后,用于培养分选后的人骨髓极小胚胎样干细胞,以细胞形态、生长曲线作为胚胎成纤维细胞和饲养层的评价指标。结果与结论:从人胚胎中成功分离培养出人胚胎成纤维细胞,该细胞可传代24代以上,且经过传代及冻存复苏后生物学特性无改变。丝裂酶素C低于12 mg/L时,人胚胎成纤维细胞增殖不能完全抑制;高于14 mg/L,人胚胎成纤维细胞可能死亡。12 mg/L丝裂霉素C作用3 h后能较好地抑制人胚胎成纤维细胞的增殖,并且保持其活力约2周,可以在很长一段时间内用作人骨髓极小胚胎样干细胞的饲养层。
BACKGROUND：Very smal embryonic-like stem cells are a kind of non-hemopoietic stem cells, which have similar biological characteristics to embryonic stem cells. But the method of its culture and in vitro proliferation is rarely reported. Studies have speculated that human embryonic fibroblasts can provide a good microenvironment for in vitro culture and proliferation of very smal embryonic-like stem cells.
OBJECTIVE：To isolate and cultivate human embryonic fibroblasts derived from human embryonic trunks and to establish a feeder layer culture system of human embryonic fibroblasts for culturing very smal embryonic-like stem cells derived from human bone marrow.
METHODS：The human embryonic fibroblasts were isolated from the subcutaneous connective tissue of human embryos at pregnant 5-9 weeks using trypsin digestion method. Different concentrations of mitomycin C were used to pretreat feeder layers, which were used for cultivating very smal embryonic-like stem cells derived from human bone marrow. The effects of human embryonic fibroblasts and feeder layers were assessed by cel morphology and growth curves.
RESULTS AND CONCLUSION：The human embryonic fibroblasts were successful y isolated and cultivated from human embryos, and they could be passaged beyond the 24th generation. The biologic characteristics of the cells had no changes after passage and cryopreservation. The optimal concentration of mytomcin C to inhibit proliferation of human embryonic fibroblasts was l2 mg/L for 3 hours. The human embryonic fibroblasts derived from human embryos are successful y isolated and cultivated and to produce feeder layers for very smal embryonic-like stem cells derived from human bone marrow.
出处
《中国组织工程研究》
CAS
CSCD
2013年第40期7096-7101,共6页
Chinese Journal of Tissue Engineering Research
基金
国家自然科学基金资助项目(81170104)~~
