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Sprouty4 deficiency potentiates Ras-independent angiogenic signals and tumor growth

Koji Taniguchi1, Takuma Ishizaki, Toranoshin Ayada

  • 1Division of Molecular and Cellular Immunology, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan.

Cancer Science
|June 5, 2009
PubMed

Insights

Sprouty4 acts as a tumor suppressor by inhibiting blood vessel growth. Its absence in knockout mice accelerates tumor development and blood vessel formation, highlighting its role in regulating angiogenesis.

Area of Science:

  • Molecular Biology
  • Oncology
  • Physiology

Background:

  • Sprouty proteins negatively regulate receptor tyrosine kinase (RTK) signaling pathways.
  • Sprouty proteins are recognized for their tumor suppressor functions.
  • The in vivo pathophysiological roles of Sproutys require further investigation.

Purpose of the Study:

  • To investigate the physiological function of Sprouty4 as an angiogenic regulator.
  • To utilize Sprouty4 knockout (KO) mice and cells to examine its role in angiogenesis.

Main Methods:

  • Tumorigenicity assays in Sprouty4 KO and wild type (WT) mice.
  • Assessment of neovascularization in transplanted tumors.
  • In vivo and ex vivo angiogenesis assays using vascular endothelial growth factor-A (VEGF-A), basic fibroblast growth factor (bFGF), and sphingosine-1-phosphate (S1P).
  • Analysis of Sprouty4's effect on Ras-independent (VEGF-A, S1P) and Ras-dependent (VEGF-C) signaling pathways.

Main Results:

  • Transplanted tumor cells exhibited significantly faster growth in Sprouty4 KO mice compared to WT mice.
  • Enhanced neovascularization was observed in tumors grown in Sprouty4 KO mice.
  • VEGF-A-induced angiogenesis and vascular permeability were increased in Sprouty4 KO mice.
  • Ex vivo angiogenesis in aortic explants was enhanced in Sprouty4 KO mice.
  • Sprouty4 was found to suppress Ras-independent VEGF-A and S1P signaling but not Ras-dependent VEGF-C signaling.

Conclusions:

  • Sprouty4 selectively suppresses Ras-independent angiogenic factor signals.
  • Sprouty4 functions as a critical negative regulator of pathophysiological angiogenesis.
  • These findings underscore the importance of Sprouty4 in controlling tumor growth and vascularization.

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