Integrating positional information at the level of Smad1/5/8.

Integrating positional information at the level of Smad1/5/8.
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DOI:
10.1016/j.gde.2008.06.001
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发表时间:
2008-08
影响因子:
4
通讯作者:
De Robertis, E. M.
De Robertis, E. M.
中科院分区:
生物学2区
文献类型:
--
作者:
Eivers, Edward;Fuentealba, Luis C.;De Robertis, E. M.

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BMP信号的强度是由细胞表面受体在c端磷酸化Smad1/5/8决定的。除了bmp激活的磷酸化外,最近的研究表明,MAPK和GSK3激酶的顺序磷酸化可以负向调节pSmad1Cter信号的活性。连接体区域的这些磷酸化导致Smad1被转运到中心体区域,通过蛋白酶体机制进行多泛素化和降解。在非洲爪蟾胚胎中,调节GSK3的Wnt信号诱导外胚层向表皮分化,这种Wnt效应需要激活BMP-Smad1/5/8信号通路。这些发现对于理解背腹和前后模式如何在早期胚胎形态发生领域无缝整合具有深远的意义。
The intensity of the BMP signal is determined by cell surface receptors that phosphorylate Smad1/5/8 at the C-terminus. In addition to this BMP-activated phosphorylation, recent studies have shown that sequential phosphorylations by MAPK and GSK3 kinases can negatively regulate the activity of the pSmad1Cter signal. These phosphorylations in the linker region cause Smad1 to be transported to the centrosomal region, polyubiquitinylated and degraded by the proteasomal machinery. In Xenopus embryos, Wnt signals, which regulate GSK3, induce ectoderm to adopt an epidermal fate and this Wnt effect requires an active BMP-Smad1/5/8 signaling pathway. These findings have profound implications for understanding how dorsal-ventral and anterior-posterior patterning are seamlessly integrated in the early embryonic morphogenetic field.
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