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Platelet-activating factor induces up-regulation of antiapoptotic factors in a melanoma cell line through nuclear

Kook Heon Seo1, Hyun-Mi Ko, Han-A Kim

  • 1Department of Biological Sciences, The Institute of Basic Sciences, Chonnam National University, Kwangju, Republic of Korea.

Cancer Research
|May 3, 2006
PubMed

Insights

Platelet-activating factor (PAF) promotes melanoma cell survival by increasing antiapoptotic factors via nuclear factor-kappaB (NF-kappaB). This suggests PAF may reduce chemotherapy effectiveness in B16F10 melanoma.

Area of Science:

  • Oncology
  • Cell Biology
  • Immunology

Background:

  • Melanoma cell proliferation and apoptosis are critical factors in cancer progression.
  • Platelet-activating factor (PAF) is implicated in various cellular processes, including inflammation and cell survival.
  • Understanding molecular mechanisms regulating melanoma cell fate is crucial for developing effective cancer therapies.

Purpose of the Study:

  • To investigate the role of platelet-activating factor (PAF) in modulating apoptosis-regulating factors in B16F10 melanoma cells.
  • To elucidate the involvement of nuclear factor-kappaB (NF-kappaB) signaling in PAF-mediated effects on melanoma cells.
  • To assess the impact of PAF on the efficacy of chemotherapeutic agents in melanoma models.

Main Methods:

  • Quantitative real-time PCR to measure mRNA expression of apoptosis-regulating factors.
  • Western blotting to assess protein synthesis of antiapoptotic and proapoptotic factors.
  • Inhibition studies using a selective nuclear factor-kappaB (NF-kappaB) inhibitor, parthenolide.
  • Enzyme activity assays for caspases (caspase-3, -8, -9).
  • In vivo studies using a Matrigel-based subcutaneous model with B16F10 melanoma cells.

Main Results:

  • PAF significantly increased mRNA and protein expression of antiapoptotic factors Bcl-2 and Bcl-xL in B16F10 cells.
  • PAF did not increase the expression of the proapoptotic factor Bax.
  • Inhibition of NF-kappaB by parthenolide blocked PAF-induced changes in antiapoptotic factors.
  • PAF attenuated etoposide-induced increases in caspase activities and melanoma cell death.
  • PAF promoted B16F10 cell growth in vivo and reduced the inhibitory effect of etoposide.

Conclusions:

  • Platelet-activating factor (PAF) induces the up-regulation of antiapoptotic factors, specifically Bcl-2 and Bcl-xL, in a melanoma cell line.
  • This effect is dependent on nuclear factor-kappaB (NF-kappaB) signaling.
  • PAF may reduce the cytotoxic efficacy of chemotherapeutic agents like etoposide by promoting melanoma cell survival.

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