PDGF mediates derivation of human embryonic germ cells

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• 作者：Yang Li^a ; ^b ; Wan Xing Hong^c ; Baojin Lan^d ; Xiaoyan Xu^b ; Yinan Liu^a ; Lin Kong^b ; Yaxuan Li^b ; Shixin Zhou^a ; Ying Liu^e ; Ruopeng Feng^f ; Sibo Jiang^a ; Qihua He^g ; Jichun Tan^b ; ^{tjczjh@163.com" class="auth_mail}
• 关键词：PDGF ; Human embryonic germ cells ; Derivation
• 刊名：Differentiation
• 出版年：November-December, 2013
• 年：2013
• 卷：86
• 期：4-5
• 页码：141-148
• 全文大小：2692 K

文摘

Human embryonic germ cells (hEGCs) are a valuable and underutilized source of pluripotent stem cells. Unlike embryonic stem cells, which have been extensively studied, little is known about the factors that regulate hEGC derivation and maintenance. This study demonstrates for the first time a central role for selective activation of PDGFR signaling in the derivation and maintenance of pluripotency in hEGCs. In the study, hEGCs were found to express PDGF receptor 伪 at high levels compared to human embryonic stem cells (hESCs). PDGF significantly improved formation of alkaline phosphatase (AP) positive hEGC colonies. We subsequently determined that PDGF activates the phosphatidylinositol-3-kinase (PI3K) pathway as phosphorylation of AKT was up-regulated in response to PDGF. Furthermore, inhibition of PI3K signaling using small molecular inhibitor LY294002 led to significantly decreased AP positive hEGC colony formation whereas inhibition of MAPK pathway using U0126 had a negligible effect. We established a primary mechanism for PDGF mediated derivation and maintenance of hEGCs by demonstrating that OCT4 was upregulated and PTEN was suppressed in a dose dependent manner in response to PDGF.