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Updated: Jun 26, 2026

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
09:32

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

Published on: June 15, 2017

A role for Syndecan-4 in neural induction involving ERK- and PKC-dependent pathways

Sei Kuriyama1, Roberto Mayor

  • 1Department of Cell and Developmental Biology, University College London, Gower Street, London WC1E 6BT, UK.

Development (Cambridge, England)
|January 16, 2009
PubMed

Insights

Syndecan-4 (Syn4) plays a crucial role in neural induction in Xenopus embryos. This heparan sulfate proteoglycan activates both FGF/ERK and PKC signaling pathways to promote neural cell development.

Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Molecular Neuroscience

Background:

  • Syndecan-4 (Syn4) is a heparan sulfate proteoglycan known to regulate cell migration and bind growth factors like FGF.
  • Its precise role in early embryonic development, particularly neural induction, remains largely unexplored.

Purpose of the Study:

  • To investigate the novel function of Syndecan-4 (Syn4) in the process of neural induction in Xenopus embryos.
  • To elucidate the molecular mechanisms and signaling pathways by which Syn4 mediates neural development.

Main Methods:

  • Utilized antisense morpholino oligonucleotides for Syn4 knockdown in Xenopus embryos.
  • Performed Syn4 mRNA injection to assess cell-autonomous effects on neural marker expression.
  • Investigated signaling pathways using dominant-negative FGF receptor, specific inhibitors (SU5402, U0126), and manipulation of PKC isoforms (PKCdelta, PKCalpha).

Main Results:

  • Syn4 knockdown inhibited neural marker expression in the neural plate and animal caps.
  • Syn4 overexpression induced cell-autonomous neural marker expression.
  • Syn4's neuralizing activity involves parallel FGF/ERK and PKC signaling pathways.
  • The PKC pathway activation requires inhibition of PKCdelta and activation of PKCalpha, which in turn affects Rac GTPase and c-Jun.

Conclusions:

  • Syndecan-4 is essential for neural induction in Xenopus.
  • Syn4 acts through both FGF/ERK and a novel PKC-dependent pathway involving PKCalpha, Rac GTPase, and c-Jun.
  • These findings establish a link between FGF and PKC signaling in neural induction.

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