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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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Signal transduction cascade shared by epidermal growth factor and platelet-derived growth factor is a major pathway

A Masuda1, S Kizaka-Kondoh, H Miwatani

  • 1Laboratory of Ultrastructure Research, Aichi Cancer Center Research Institute, Nagoya, Japan.

The New Biologist
|May 1, 1992
PubMed

Insights

Two NRK cell mutants resistant to epidermal growth factor (EGF) and transforming growth factor-beta reveal a shared signaling pathway crucial for oncogene-induced cell transformation and growth.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Oncology

Background:

  • Epidermal Growth Factor (EGF) and Transforming Growth Factor-beta (TGF-β) are key regulators of cell growth and differentiation.
  • Signal transduction pathways mediate cellular responses to external stimuli, including growth factors and oncogenes.
  • NRK cells are a commonly used model system for studying cell transformation and signaling pathways.

Purpose of the Study:

  • To identify and characterize novel NRK cell mutants defective in growth factor signaling.
  • To elucidate the role of a shared signaling cascade in oncogene-induced cell transformation.
  • To investigate the divergence of mitogenic and oncogenic signals within the EGF/PDGF pathway.

Main Methods:

  • Isolation and complementation analysis of recessive NRK cell mutants.
  • Assays for cell transformation, including soft agar growth and focus formation.
  • Analysis of signaling pathways affected by oncogene expression in mutant cells.

Main Results:

  • Two mutually complementary NRK cell mutants, refractory to EGF and TGF-β transformation, were isolated.
  • These mutants are defective in a signal transduction cascade common to EGF and Platelet-Derived Growth Factor (PDGF).
  • Transformation by various oncogenes (v-fms, v-erbB, v-ras, v-src, SV40 T antigen, etc.) is mediated by this EGF/PDGF cascade.
  • The EGF/PDGF cascade branches into distinct mitogenic and oncogenic signals, with the latter essential for anchorage-independent growth.

Conclusions:

  • A conserved signaling pathway initiated by EGF and PDGF is essential for oncogenic transformation of NRK cells.
  • This pathway bifurcates, generating both proliferative (mitogenic) and transformation-driving (oncogenic) signals.
  • Understanding this pathway provides insights into the mechanisms of cancer development and potential therapeutic targets.

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