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Polyoma middle T antigen or v-src desensitizes human epidermal growth factor receptor function and interference by a

M Ono1, Y Nakayama, G Princler

  • 1Department of Biochemistry, Oita Medical University, Japan.

Experimental Cell Research
|December 1, 1992
PubMed

Insights

Epidermal Growth Factor Receptor (EGF-R) down-regulation is key for cell regulation. Viral oncogenes like polyoma middle T antigen and v-src interfere with EGF-R down-regulation, affecting cell growth.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Oncology

Background:

  • Epidermal Growth Factor Receptor (EGF-R) down-regulation is a critical cellular process for regulating EGF signaling in both normal and malignant cells.
  • Understanding the mechanisms of EGF-R regulation is crucial for developing targeted cancer therapies.

Purpose of the Study:

  • To investigate how viral oncogenes, specifically polyoma middle T antigen (MTAg) and v-src, affect the EGF-induced down-regulation of EGF-R.
  • To explore the impact of altered EGF-R down-regulation on cellular proliferation and transformation.

Main Methods:

  • Transfection of mouse Balb/3T3 cells (BNER4) with human EGF-R cDNA.
  • Introduction of polyoma MTAg and v-src oncogenes into BNER4 cells.
  • Analysis of EGF-R cell surface expression and degradation kinetics in response to EGF.
  • Assessment of EGF-induced DNA synthesis in transfected cell lines.

Main Results:

  • Polyoma MTAg and v-src transfection diminished EGF-induced EGF-R down-regulation, leading to increased metabolic stability of EGF-R.
  • H-ras transfection did not significantly alter EGF-R down-regulation.
  • MTAg and v-src transfectants exhibited a reduced proliferative response to EGF compared to parental cells.
  • EGF-R in cells expressing MTAg but lacking EGF binding (MNER31) were properly down-regulated, suggesting MTAg's effect is dependent on EGF-R presence.

Conclusions:

  • Polyoma MTAg and v-src oncogenes modulate EGF-induced EGF-R down-regulation, potentially through direct interaction with the receptor.
  • This modulation of EGF-R trafficking and stability by viral oncogenes can influence cellular transformation and growth signaling.

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