Abstract
How do very diverse signaling pathways induce neural differentiation in Xenopus? Anti-BMP (Chordin), FGF8, and IGF2 signals are integrated in the embryo via the regulation of Smad1 phosphorylation. Neural induction results from the combined inhibition of BMP receptor serine/threonine kinases and activation of receptor tyrosine kinases that signal through MAPK and phosphorylate Smad1 in the linker region, further inhibiting Smad1 transcriptional activity. This hard-wired molecular mechanism at the level of the Smad1 transcription factor may help explain the opposing activities of IGF, FGF, and BMP signals not only in neural induction, but also in other aspects of vertebrate development.
MeSH Terms
Animals
Bone Morphogenetic Protein Receptors
Bone Morphogenetic Proteins/metabolism
DNA-Binding Proteins/metabolism
Embryo, Nonmammalian
Embryonic Induction
Fibroblast Growth Factor 8
Fibroblast Growth Factors/pharmacology
Insulin-Like Growth Factor II/pharmacology
Mice
Mitogen-Activated Protein Kinases/metabolism
NIH 3T3 Cells
Neoplasm Proteins/pharmacology
Nervous System/embryology
Phosphorylation
Receptors, Growth Factor/antagonists & inhibitors
Signal Transduction
Smad Proteins
Smad1 Protein
Trans-Activators/metabolism
Transcriptional Activation
Xenopus Proteins
Xenopus laevis
Chemicals
Bone Morphogenetic Proteins
DNA-Binding Proteins
Fgf8 protein, mouse
MXD1 protein, Xenopus
Neoplasm Proteins
Receptors, Growth Factor
Smad Proteins
Smad1 Protein
Smad1 protein, mouse
Trans-Activators
Xenopus Proteins
Fibroblast Growth Factor 8
Fibroblast Growth Factors
Insulin-Like Growth Factor II
Mitogen-Activated Protein Kinases
Bone Morphogenetic Protein Receptors
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Pera Edgar M
Howard Hughes Medical Institute and Department of Biological Chemistry, University of California-Los Angeles, Los Angeles, CA 90095-1662, USA.
Ikeda Atsushi
Eivers Edward
De Robertis Eddy M
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