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本帖最后由 hyde 于 2011-1-21 21:53 编辑 " ^& o# s# Y" s1 g) y, n# E% f3 j6 y
4 z7 ^* K* y5 s% t: hPig Epiblast Stem Cells Depend on Activin/Nodal Signaling for Pluripotency and Self-Renewal4 X/ T# w. I/ Y* q4 c% r
pEpiSC通过Activin/Nodal Signaling信号途径来维持多能性和自我更新能力
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2 F4 m8 z9 a I# |) _$ PRamiro Alberio , Nicola Croxall , and Cinzia Allegrucci 4 I( I+ T$ Z p/ A, O9 l
( _ D9 y: m* @! t* |0 ~1.说明:原文来源自http://www.liebertonline.com/doi/abs/10.1089/scd.2010.0012
6 M) |6 [7 }, c' J6 q: T. T由干细胞之家新闻小组成员Hyde翻译(转帖请注明)1 v' \$ X6 o; }, ?) ?+ E
2.翻译内容
& U4 m! I5 F" Z: Y C$ [mEpiSC和hESC通过Activin/Nodal signaling信号途径来维持细胞的多能性和自我更新能力。我们想要通过研究获知该信号系统在pEpiSC中的作用。我们取10.5-12天的猪胚来建立pEpiSC细胞系。从获得的胚胎中分离出epiblast。其中使用小鼠灭火成纤维细胞(MF)做为饲养细胞,并在培养基中补充bFGF。获得的pEpiSC表达多能性核心标准因子,如 OCT4 (或POU5F1 )、NANOG 、SOX2 和 NODAL。但是监测不到 REX1 和AP(碱性磷酸酶)活性。为了研究 leukemia inhibitory factor (LIF)/JAK/STAT3 pathway信号途径对pEpiSC多能性和自我更新能力的影响,我们在培养基中分别加入特异性的抑制剂JAK I inhibitor 420099和LIF的抗体。pEpiSC的多能性在多次传代培养(>3)后都未出现明显的变化。相反,在培养基中加入针对 Activin/Nodal pathway的抑制剂Alk-5 inhibitor B431542,pEpiSC出现向神经细胞分化的现象。 pEpiSC 是具有多能性的,它们可以自发分化为内胚层、外胚层、中胚层组织。在诱导条件下如BMP-4,还可以分化为滋养层细胞和生殖系细胞前体。我们的研究发现猪的 epiblasts 能够表达多能性的核心标准因子,同时 pEpiSC 的自我更新能力与Activin/Nodal signaling信号途径相关。这项研究也进一步证明了通过Activin/Nodal signal信号途径来保持多能性在不同的哺乳生物之间具有一定的保守性。
1 J/ Z. a Y$ e# u9 O& A3.原文! w H& `. w. l; ^! \
Activin/Nodal signaling is required for maintaining pluripotency and self-renewal of mouse epiblast stem cells
0 k2 B# s+ t% o/ Mand human embryonic stem cells (hESC). In this study, we investigated whether this signaling mechanism is9 ?1 e$ b) C7 H1 O( o& T) p
also operative in cultured epiblasts derived from Days 10.5–12 pig embryos. Pig epiblast stem cell lines (pEpiSC)1 T/ O: o- {/ Y) e% C; f/ r
were established on mouse feeder layers and medium supplemented with basic fibroblast growth factor (bFGF).
( \0 k8 ^9 c+ ^) h/ ?6 T q! MpEpiSC express the core pluripotency factors OCT4 (or POU5F1 ), NANOG , SOX2 , and NODAL , but they do not! b# u! Q4 n% Y: B6 f1 N
express REX1 or alkaline phosphatase activity. Blocking leukemia inhibitory factor (LIF)/JAK/STAT3 pathway# m) Z8 F2 g4 o/ V" W) e- s" D
by adding the specific JAK I inhibitor 420099 and an anti-LIF antibody over 3 passages did not affect pluripotency
8 K* @: F8 N% Y/ h4 \of pEpiSC. In contrast, cells grown with the Alk-5 inhibitor SB431542, which blocks Activin/Nodal" g- B2 J0 R0 a
pathway, differentiated readily toward the neural lineage. pEpiSC are pluripotent, as established by their differentiation
2 x, X% D. [6 y, i8 z' F+ E5 ?9 O: wpotential to ectoderm, mesoderm, and endoderm. These cells can be induced to differentiate toward
8 {, u6 _- H% E' |1 R- Itrophectoderm and to germ cell precursors in response to bone morphogenetic protein 4 (BMP-4). In conclusion,
6 i$ L& S$ W3 Q5 v* _our study demonstrates that pig epiblasts express the core pluripotency genes and that the capacity for maintaining
) M- Q% i; p: b( [+ z# gself-renewal in pEpiSC depends on Activin/Nodal signaling. This study provides further evidence that
7 G, a# E/ N9 L5 u( |3 Emaintenance of pluripotency via Activin/Nodal signal is conserved in mammals.
. k( V, F( O F9 Q$ S4.上传原文附件
! {2 N1 E1 O' q) U5.个人翻译,理解不准确的语句还望大家积极指出。+ c1 h3 a, S% i5 b/ b2 j
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