Cargando…

PV.1 induced by FGF-Xbra functions as a repressor of neurogenesis in Xenopus embryos

During Xenopus early development, FGF signaling is involved in mesoderm formation and neurogenesis by modulating various signaling cascades. FGF-MAPK signaling induces Xbra expression, which maintains mesodermal fate through an autocatalytic-loop. Interestingly, previous reports have demonstrated th...

Descripción completa

Detalles Bibliográficos
Autores principales: Yoon, Jaeho, Kim, Jung-Ho, Lee, Sung-Young, Kim, SungChan, Park, Jae-Bong, Lee, Jae-Yong, Kim, Jaebong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Korean Society for Biochemistry and Molecular Biology 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4345511/
https://www.ncbi.nlm.nih.gov/pubmed/24499677
http://dx.doi.org/10.5483/BMBRep.2014.47.12.290
Descripción
Sumario:During Xenopus early development, FGF signaling is involved in mesoderm formation and neurogenesis by modulating various signaling cascades. FGF-MAPK signaling induces Xbra expression, which maintains mesodermal fate through an autocatalytic-loop. Interestingly, previous reports have demonstrated that basic FGF (bFGF) treatment alone does not induce neurogenesis in ectodermal explants, even though FGF signaling inhibits BMP signaling via phosphorylation in Smad1 linker region. In addition, the overexpression of dominantnegative Xbra induces neurogenesis in ectodermal explants. However, the detailed mechanism underlying these phenomena has not yet been clarified. In this work, we showed that bFGF-Xbra signaling increased the PV.1 expression. DN-Xbra was found to decrease PV.1 expression, and the co-injection of PV.1 with DN-Xbra reduced neurogenesis in ectodermal explants. Furthermore, the knockdown of PV.1 induced neurogenesis in bFGF-treated ectodermal explants. Taken together, our results demonstrate that FGF-Xbra signaling induces PV.1 expression and that PV.1 functions as a neural repressor in the FGF-treated ectoderm. [BMB Reports 2014; 47(12): 673-678]