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Pair-wise regulation of convergence and extension cell movements by four phosphatases via RhoA

Mark van Eekelen1, Vincent Runtuwene, Wouter Masselink

  • 1Hubrecht Institute and University Medical Center Utrecht, Utrecht, The Netherlands.

Plos One
|May 1, 2012
PubMed

Insights

Protein-tyrosine phosphatases regulate vertebrate body axis formation. Two phosphatases activate RhoA, while two inhibit it, ensuring proper cell movements during gastrulation.

Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Molecular Genetics

Background:

  • Vertebrate body axis formation relies on complex signaling pathways.
  • Protein-tyrosine phosphatases (PTPs) are key regulators of cellular processes.
  • Their specific roles in early development, particularly cell movements, require further elucidation.

Purpose of the Study:

  • To investigate the function of PTP-BL and Ptpn20 in vertebrate gastrulation.
  • To determine the involvement of PTP signaling in convergence and extension cell movements.
  • To elucidate the regulatory mechanisms of RhoA signaling by PTPs during development.

Main Methods:

  • Gene knockdown studies in vertebrate models.
  • Analysis of developmental defects and cell movement patterns.
  • Investigation of RhoA activation and downstream effectors.

Main Results:

  • Ptpn20 is a paralogue of PTP-BL; both are essential for normal gastrulation.
  • Specific PTPs (RPTPα, PTPε) activate RhoA, while others (PTP-BL, Ptpn20) inhibit it.
  • NGEF and Arhgap29 were identified as downstream regulators of RhoA in these processes.

Conclusions:

  • A model is proposed where opposing PTP-RhoA pathways control cell polarization.
  • This balance is critical for normal convergence and extension cell movements.
  • Understanding these PTP networks offers insights into developmental mechanisms.

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