Inhibition of FGF signaling converts dorsal mesoderm to ventral mesoderm in early Xenopus embryos

Sung Young Lee, Soo Kyung Lim, Sang Wook Cha, Jaeho Yoon, Seung Hwan Lee, Hyun Shik Lee, Jae Bong Park, Jae Yong Lee, Sung Chan Kim, Jaebong Kim

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


In early vertebrate development, mesoderm induction is a crucial event regulated by several factors including the activin, BMP and FGF signaling pathways. While the requirement of FGF in Nodal/activin-induced mesoderm formation has been reported, the fate of the tissue modulated by these signals is not fully understood. Here, we examined the fate of tissues when exogenous activin was added and FGF signaling was inhibited in animal cap explants of Xenopus embryos. Activin-induced dorsal mesoderm was converted to ventral mesoderm by inhibition of FGF signaling. We also found that inhibiting FGF signaling in the dorsal marginal zone, in vegetal-animal cap conjugates or in the presence of the activin signaling component Smad2, converted dorsal mesoderm to ventral mesoderm. The expression and promoter activities of a BMP responsive molecule, PV.1 and a Spemann organizer, noggin, were investigated while FGF signaling was inhibited. PV.1 expression increased, while noggin decreased. In addition, inhibiting BMP-4 signaling abolished ventral mesoderm formation induced by exogenous activin and FGF inhibition. Taken together, these results suggest that the formation of dorso-ventral mesoderm in early Xenopus embryos is regulated by a combination of FGF, activin and BMP signaling.

Original languageEnglish (US)
Pages (from-to)99-107
Number of pages9
Issue number2
StatePublished - Sep 2011


  • Activin
  • Bone morphogenetic protein-4
  • Fibroblast growthfactor
  • Mesoderm formation
  • Xenopus3

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