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Interferon-alpha-induced inhibition of B16 melanoma cell proliferation: interference with the bFGF autocrine growth

M Torcia1, M Lucibello, G De Chiara

  • 1Department of Experimental Medicine and Biochemical Sciences, University of Rome "Tor Vergata,", Rome, Italy. g.torcia@dfc.unifi.it

Biochemical and Biophysical Research Communications
|September 2, 1999
PubMed

Insights

Interferon-alpha (IFN-alpha) inhibits melanoma cell growth by blocking basic fibroblast growth factor (bFGF) synthesis. It also releases a peptide that interferes with bFGF receptor binding, disrupting the autocrine growth circuit.

Area of Science:

  • Oncology
  • Immunology
  • Cell Biology

Background:

  • Melanoma cell growth is often driven by autocrine growth factors.
  • Interferon-alpha (IFN-alpha) is known to have anti-proliferative effects on cancer cells.

Purpose of the Study:

  • To investigate the molecular mechanisms of IFN-alpha-induced growth inhibition in B16 murine melanoma cells.
  • To elucidate the role of fibroblast growth factors (FGFs) in IFN-alpha's anti-melanoma activity.

Main Methods:

  • Treatment of B16 melanoma cells with varying concentrations of IFN-alpha.
  • Assessment of cell apoptosis and growth arrest.
  • Analysis of basic fibroblast growth factor (bFGF) and acidic FGF (aFGF) synthesis and release.

Main Results:

  • IFN-alpha induced significant growth arrest in B16 melanoma cells without causing apoptosis.
  • IFN-alpha potently inhibited the synthesis of the autocrine growth factor bFGF.
  • A low-molecular-weight peptide, related to aFGF, was released, interfering with bFGF receptor binding.

Conclusions:

  • IFN-alpha exerts anti-melanoma effects by specifically modulating the bFGF autocrine signaling pathway.
  • The inhibition of bFGF synthesis and the release of interfering peptides are key mechanisms of IFN-alpha's action.
  • These findings highlight a novel therapeutic strategy targeting growth factor circuits in melanoma.

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