生物谷Bioon.com 讯 中国台湾一家科研机构研究团队利用胎儿脐带血管里的人类脐静脉内皮细胞,并加入 2个非致癌性基因,成功将内皮细胞转变成万能干细胞,且免除有致癌风险基因,研究成果和国际干细胞研究同步。
台湾卫生研究院细胞及系统医学研究所副研究员颜伶汝今天表示,2006年和2007年日本和美国分别宣布发现将普通皮肤细胞转化为干细胞的方法,这种干细胞功能与胚胎干细胞相差不多,因此被称为万能干细胞,简称iPS细胞。
不过,颜伶汝说,以日本的研究来说,必须加入 4个基因,才能把皮肤的纤维母细胞诱导成与胚胎干细胞类似的干细胞;但是,在4个基因中,包括c-MYC及KLF4却有让细胞癌化的能力,因此运用在临床上仍有疑虑。
为了避免加入致癌性基因、又可以成功发展出万能干细胞,颜伶汝说,“国卫院”团队利用胎儿脐带血管里的人体脐静脉内皮细胞HUVEC,只需要利用2个非致癌性基因OCT4及SOX2,就可以把HUVEC内皮细胞转变成万能干细胞,也不会让细胞癌化。
她说,因为HUVEC内皮细胞取自新生儿脐带,具有取得容易的优点,且能够成功避免有致癌疑虑的基因,这项研究也是台湾在这项领域第一个杰出的成就,并且能和国际的干细胞研究同步。
她说,这个万能干细胞也增加临床应用的机会,像是可能发展出神经细胞、肝脏细胞等,甚至运用在药物测试。
生物谷推荐原文出处:
Arteriosclerosis, Thrombosis, and Vascular Biology doi: 10.1161/ATVBAHA.110.206540
Endogenous KLF4 Expression in Human Fetal Endothelial Cells Allows for Reprogramming to Pluripotency With Just OCT3/4 and SOX2
Pai-Jiun Ho ; Men-Luh Yen ; Jhong-De Lin ; Lan-Sun Chen ; Hsin-I Hu ; Chun-Kai Yeh ; Chiu-Ying Peng ; Chen-Yu Lin ; Shaw-Fang Yet ; and B. Linju Yen *
The introduction of 4 transcription factors―c-MYC, OCT3/4, SOX2, and KLF4―can reprogram somatic cells back to pluripotency. However, some of the factors used are oncogenic, making therapeutic application unfeasible. Although the use of adult stem cells expressing high endogenous levels of some of these factors allows for reprogramming with fewer exogenous genes, such cells are rare and may have accumulated genetic mutations. Our goal was to reprogram human somatic cells without oncogenic factors. We found that high endogenous expression of KLF4 in human umbilical vein endothelial cells (HUVECs) allows for generation of induced pluripotent stem cells (iPSCs) with just 2 nononcogenic factors, OCT3/4 and SOX2. HUVECs were infected with lentivirus containing OCT4 and SOX2 for generation of iPSCs. These 2-factor HUVEC iPSCs were morphologically similar to embryonic stem cells, express endogenous pluripotency markers postreprogramming, and can differentiate toward lineages of all 3 germ layers both in vitro and in vivo. iPSCs can be generated from HUVECs with only 2 nononcogenic factors. The use of fetal cells for reprogramming without oncogenic factors may provide an efficient in vitro model for human iPSC research, as well as a novel source for possible therapeutic use.