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人類胚胎干細胞經(jīng)表觀修飾后生物學特性可與小鼠胚胎干細胞相似
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Human embryonic stem cells with biological and epigenetic characteristics similar to those of mouse ESCs 人類胚胎干細胞經(jīng)表觀修飾后生物學特性可與小鼠胚胎干細胞相似 Rudolf Jaenisch 2010 PNAS Abstract:Human and mouse embryonic stem cells (ESCs) are derived fromblastocyst-stage embryos but have very different biological properies, and molecular analyses suggest that the pluripotent state ofhuman ESCs isolated so far corresponds to that of mousederivedepiblast stem cells (EpiSCs). Here we rewire the identity of conventional human ESCs into a more immature state that extensivelyshares defining features with pluripotent mouse ESCs. This wasachieved by ectopic induction of Oct4, Klf4, and Klf2 factorscombined with LIF and inhibitors of glycogen synthase kinase 3β(GSK3β) and mitogen-activated protein kinase (ERK1/2) pathway.Forskolin, a protein kinase Apathway agonist which can induceKlf4 and Klf2 expression, transiently substitutes for the requirementfor ectopic transgene expression. In contrast to conventional humanESCs, these epigenetically convertedcellshavegrowthproperties, anX-chromosome activation state (XaXa), a gene expression profile,and a signaling pathway dependence that are highly similar to thoseof mouse ESCs. Finally, the same growth conditions allow the deri-vation of human induced pluripotent stem (iPS) cells with similarproperties as mouse iPS cells. The generation of validated “naïve”human ESCs will allow the molecular dissection of a previously undefined pluripotent state in humans and may open up new oppor-tunities for patient-specific, disease-relevant research. 摘要:•人類和小鼠的胚胎干細胞(h/mESCs)來源于胚泡時期胚胎,研究顯示,二者的細胞分化潛能并不相同。相關分析表明,人類ESCs的分化潛能僅與小鼠外胚層干細胞(EpiSCs)相似。本研究通過向hESCs中導入Oct4, Klf4和Klf2 因子,LIF、GSK3β抑制因子及ERK1/2。為了誘導Klf4和Klf2的表達,我們將其誘導劑毛猴素也一同轉染入hESCs。與傳統(tǒng)的hESCs相比,這種經(jīng)過后天修飾的細胞具有生長潛能,具有X染色體激活區(qū);利用基因芯片技術分析該種細胞的基因表達,發(fā)現(xiàn)與mESCs中基因表達相似。最后,相同的培養(yǎng)條件能同時誘導出人類誘導式多能性干細胞(hiPS)和miPS。這種更具分化潛能的“原始”細胞,有利于我們深入了解人類干細胞的更多的分化潛能,并將其應用與疾病的基礎研究與治療。 ********** [ Last edited by silicare on 2011-5-23 at 17:50 ] |
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