α-Interferon potentiates epidermal growth factor receptor-mediated effects on human epidermoid carcinoma KB cells

M. Caraglia, A. Leardi, S. Corradino, F. Ciardiello, A. Budillon, R. Guarrasi, A. R. Bianco, P. Tagliaferri

Research output: Contribution to journalArticlepeer-review

Abstract

The molecular mechanisms underlying the growth inhibition of human tumor cells induced by recombinant interferon-α (IFNα) are mostly unknown. It has been proposed that this effect could be related to down-regulation and/or impaired function of peptide growth factor receptors (PGF-Rs) in tumor cells exposed to IFNα. However, we have previously described that IFNα-induced growth inhibition of human epidermoid carcinoma cells is paralleled by up-regulation of epidermal growth factor receptor (EGF-R). Here we report that an increase in EGF-R synthesis is detectable after 3 hr of exposure to cytostatic concentration of IFNα in epidermoid KB tumor cells. In these experimental conditions IFNα does not depress and even potentiates EGF-R function. IFNα-treated KB cells retain sensitivity to the cytotoxic activity of the anti-EGF-R 225 monoclonal antibody (MAb), which acts through receptor blockade, and are sensitized to the growth-promoting effect of EGF. EGF-induced tyrosine (tyr) phosphorylation both of total cellular protein extracts and of the immunoprecipitated EGF-R is increased in IFNα-treated cells. We conclude that a cross-talk between IFNα and EGF occurs in KB cells since IFNα, at cytostatic concentration, potentiates the effects mediated by the EGF-R.

Original languageEnglish
Pages (from-to)342-347
Number of pages6
JournalInternational Journal of Cancer
Volume61
Issue number3
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Fingerprint Dive into the research topics of 'α-Interferon potentiates epidermal growth factor receptor-mediated effects on human epidermoid carcinoma KB cells'. Together they form a unique fingerprint.

Cite this