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The secreted serine protease xHtrA1 stimulates long-range FGF signaling in the early Xenopus embryo

Författare

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.

Avdelning/ar

Publiceringsår

2007

Språk

Engelska

Sidor

226-241

Publikation/Tidskrift/Serie

Developmental Cell

Volym

13

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

Cell Press

Ämne

  • Cell and Molecular Biology

Status

Published

Forskningsgrupp

  • Matrix Biology

ISBN/ISSN/Övrigt

  • ISSN: 1534-5807