The secreted serine protease xHtrA1 stimulates long-range FGF signaling in the early Xenopus embryo
Author
Summary, in English
We found that the secreted serine protease xHtrA1, expressed in the early embryo and transcriptionally activated by FGF signals, promotes posterior development in mRNA-injected Xenopus embryos. xHtrA1 mRNA led to the induction of secondary tail-like structures, expansion of mesoderm, and formation of ectopic neurons in an FGF-dependent manner. An antisense morpholino oligonucleotide or a neutralizing antibody against xHtrA1 had the opposite effects. xHtrA1 activates FGF/ ERK signaling and the transcription of FGF genes. We show that Xenopus Biglycan, Syndecan-4, and Glypican-4 are proteolytic targets of xHtrA1 and that heparan sulfate and dermatan sulfate trigger posteriorization, mesoderm induction, and neuronal differentiation via the FGIF signaling pathway. The results are consistent with a mechanism by which xHtrA1, through cleaving proteoglycans, releases cellsurface-bound FGF ligands and stimulates long-range FGF signaling.
Department/s
- Stem Cell Center
- Matrix Biology
Publishing year
2007
Language
English
Pages
226-241
Publication/Series
Developmental Cell
Volume
13
Issue
2
Document type
Journal article
Publisher
Cell Press
Topic
- Cell and Molecular Biology
Status
Published
Research group
- Matrix Biology
ISBN/ISSN/Other
- ISSN: 1534-5807