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本帖最后由 hyde 于 2011-1-21 21:53 编辑
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9 I# ~9 O& l9 l3 ~" Z9 O3 j6 cPig Epiblast Stem Cells Depend on Activin/Nodal Signaling for Pluripotency and Self-Renewal
; ] i" \4 s2 IpEpiSC通过Activin/Nodal Signaling信号途径来维持多能性和自我更新能力2 c& D0 e/ V2 N$ y$ J
% J0 u2 F5 K f) u5 FRamiro Alberio , Nicola Croxall , and Cinzia Allegrucci
& D1 ]& ?0 V Q8 V5 J! n7 S" [4 w1 V. Q1 ~* K
1.说明:原文来源自http://www.liebertonline.com/doi/abs/10.1089/scd.2010.0012
Q5 \: t3 k+ v& [7 D* e/ u, n, r: \由干细胞之家新闻小组成员Hyde翻译(转帖请注明)
; b4 B) Z: H3 ^, Y; j* b2 t2.翻译内容; \+ u' C' S X$ A7 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。" a/ j* D, U, z2 J$ F3 g2 Q5 J
3.原文
! o7 Z! u7 w! b9 j5 A @/ t. pActivin/Nodal signaling is required for maintaining pluripotency and self-renewal of mouse epiblast stem cells6 V4 Q3 m( ]; C3 I- s
and human embryonic stem cells (hESC). In this study, we investigated whether this signaling mechanism is
+ ~ y( Y* T8 X9 \7 c5 ^ t: {also operative in cultured epiblasts derived from Days 10.5–12 pig embryos. Pig epiblast stem cell lines (pEpiSC)) C) z( Z8 n/ o& e
were established on mouse feeder layers and medium supplemented with basic fibroblast growth factor (bFGF).( r! |, p m0 M! Q ]4 b2 p
pEpiSC express the core pluripotency factors OCT4 (or POU5F1 ), NANOG , SOX2 , and NODAL , but they do not
) Q: {1 c/ h1 ^' s! o0 q/ |. k& {, Dexpress REX1 or alkaline phosphatase activity. Blocking leukemia inhibitory factor (LIF)/JAK/STAT3 pathway' h8 L, g0 e3 P% o0 t
by adding the specific JAK I inhibitor 420099 and an anti-LIF antibody over 3 passages did not affect pluripotency r8 Z. h( O, I/ n" W
of pEpiSC. In contrast, cells grown with the Alk-5 inhibitor SB431542, which blocks Activin/Nodal
* G. c; y9 T/ ^pathway, differentiated readily toward the neural lineage. pEpiSC are pluripotent, as established by their differentiation
2 q0 n4 I) |3 o& p1 Cpotential to ectoderm, mesoderm, and endoderm. These cells can be induced to differentiate toward
7 [* }9 C0 u) d7 Qtrophectoderm and to germ cell precursors in response to bone morphogenetic protein 4 (BMP-4). In conclusion,
% z4 G# m1 [8 K7 s* n4 n" mour study demonstrates that pig epiblasts express the core pluripotency genes and that the capacity for maintaining
* V1 V1 A5 L3 J# lself-renewal in pEpiSC depends on Activin/Nodal signaling. This study provides further evidence that O. A; W f$ K8 O1 ~- }0 i7 {- p
maintenance of pluripotency via Activin/Nodal signal is conserved in mammals., e; Y* z5 D* v4 m0 n E0 r( d
4.上传原文附件
) R' x s& H9 Z! Q* ]# T5.个人翻译,理解不准确的语句还望大家积极指出。3 B! u1 N0 h1 v6 U* {
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