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Spontaneously transformed NRK cells lose their mitogenic response to epidermal growth factor

R J Wegrzyn1, D Defeo-Jones, D C Heimbrook

  • 1Department of Cancer Research, Merck Sharp and Dohme Research Laboratories, West Point, Pennsylvania 19486.

Growth Factors (Chur, Switzerland)
|January 1, 1989
PubMed

Insights

Spontaneously transformed NRK cells lose their growth factor-induced DNA synthesis response. This study investigates the link between cell transformation and epidermal growth factor (EGF) signaling.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Epidermal growth factor (EGF) is crucial for cell proliferation and survival.
  • Cell transformation involves changes in cell morphology and growth properties.
  • Understanding the interplay between growth factor signaling and cell transformation is vital for cancer research.

Purpose of the Study:

  • To investigate the relationship between growth factor-induced mitogenesis and spontaneous cell transformation.
  • To characterize EGF-responsive and nonresponsive NRK cell lines.
  • To determine the impact of cell transformation on EGF signaling pathways.

Main Methods:

  • Isolation and characterization of EGF-responsive (Cl-3) and EGF-nonresponsive (Cl-10) NRK cell subclones.
  • Assessment of cell morphology, growth in soft agar, and tumor formation in nude mice.
  • Measurement of DNA synthesis in response to EGF.
  • Analysis of EGF receptor number and binding affinity.

Main Results:

  • EGF-nonresponsive Cl-10 cells exhibited hallmarks of transformation, including altered morphology, enhanced anchorage-independent growth, and increased tumor formation.
  • Cl-3 cells showed a significant increase in DNA synthesis upon EGF stimulation, while Cl-10 cells did not.
  • Both cell lines possessed similar numbers of EGF receptors with comparable binding affinities.
  • No evidence of transforming growth factor-alpha was detected.

Conclusions:

  • Spontaneous morphologic transformation in NRK cells leads to a loss of mitogenic response to EGF.
  • EGF signaling pathways are altered during cell transformation, independent of receptor number or affinity.
  • These findings highlight a dissociation between EGF receptor expression and downstream signaling in transformed cells.

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