Mesoderm induction in Xenopus caused by activation of MAP kinase
Mesoderm induction in Xenopus caused by activation of MAP kinase
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MAP 激酶激活引起爪蟾中胚层诱导
DOI:
10.1038/376058a0
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发表时间:
1995
期刊:
影响因子:
64.8
通讯作者:
James C. Smith
中科院分区:
文献类型:
--
作者:
M. Umbhauer;C. Marshall;C. Mason;R. Old;James C. Smith
MESODERM induction is a critical early step in vertebrate development, involving changes in gene expression and morphogenesis1. In Xenopus, normal mesoderm formation depends on signalling through the fibroblast growth factor (FGF) tyrosine kinase receptor24. One important signalling pathway from receptor tyro-sine kinases involves p21ras (ref. 5). Ras associates with the serine kinase c-Raf-1 in a GTP-dependent manner, and this complex phosphorylates and activates MAPK/ERK kinase (MEK), a protein kinase with dual specificity. MEK then activates p42mapk and (at least in mammals) p44mapk, members of the mitogen-activated protein (MAP) kinase family6. FGF activates MAP kinase during mesoderm induction79, and the use of dominant-negative constructs suggests that mesoderm induction by FGF requires both Ras and Raf10,11. However, these experiments do not reveal whether Ras and Raf do act through MAP kinase to induce mesoderm or whether another pathway, such as the phosphatidylinositol 3-kinase cascade12, is involved. Here we show that expression of active forms of MEK or of MAP kinase induces ventral mesoderm of the kind elicited by FGF. Overexpression of a Xenopus MAP kinase phosphatase blocks mesoderm induction by FGF, and causes characteristic defects in mesoderm formation in intact embryos, whereas inhibition of the P13 kinase and p70 S6 kinase pathways has no effect on mesoderm induction by FGF. FGF induces different types of mesoderm in a dose-dependent manner13; strikingly, this is mimicked by expressing different levels of activated MEK. Together, these experiments demonstrate that activation of MAP kinases is necessary and sufficient for mesoderm formation.
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影响因子:
56.9
作者:
POSADA, J;COOPER, JA
通讯作者:
COOPER, JA
DOI:
10.1073/pnas.91.5.1662
发表时间:
1994
影响因子:
11.1
作者:
Graves,LM;Northrop,JL;Potts,BC;Krebs,EG;Kimelman,D
通讯作者:
Kimelman,D
DOI:
10.1242/dev.120.2.453
发表时间:
1994
期刊:
Development (Cambridge, England)
影响因子:
--
作者:
Cornell,RA;Kimelman,D
通讯作者:
Kimelman,D
影响因子:
3.5
作者:
HO, SN;HUNT, HD;PEASE, LR
通讯作者:
PEASE, LR
DOI:
10.1242/dev.108.2.229
发表时间:
1990
期刊:
Development (Cambridge, England)
影响因子:
--
作者:
Smith,JC;Symes,K;Hynes,RO;DeSimone,D
通讯作者:
DeSimone,D