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Gelsolin suppresses tumorigenicity through inhibiting PKC activation in a human lung cancer cell line, PC10

N Sagawa1, H Fujita, Y Banno

  • 1Division of Cancer Gene Regulation, Research Section of Disease Control, Institute for Genetic Medicine, Hokkaido University, Sapporo, Japan.

British Journal of Cancer
|February 20, 2003
PubMed

Insights

Restoring gelsolin in lung cancer cells significantly reduced tumor formation and cell growth. Gelsolin also blocked bradykinin-stimulated signaling pathways crucial for cancer cell proliferation and tumorigenicity.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Gelsolin is downregulated in various human cancers, including lung cancer.
  • Gelsolin's role in regulating cancer cell growth and tumorigenicity requires further investigation.

Purpose of the Study:

  • To investigate the impact of gelsolin restoration on lung cancer cell tumorigenicity and proliferation.
  • To explore the effect of gelsolin on bradykinin-induced signaling pathways involving phospholipase C (PLC) and protein kinase C (PKC).

Main Methods:

  • Stable expression of gelsolin in a human lung squamous cell carcinoma line (PC10) via gene transfer.
  • In vitro assessment of cell proliferation and in vivo evaluation of tumorigenicity in nude mice.
  • Analysis of bradykinin-induced phosphatidylinositol 4,5-bisphosphate (PIP2) hydrolysis, inositoltriphosphate (IP3) production, and PKC isoform translocation.

Main Results:

  • Gelsolin-overexpressing lung cancer cells exhibited significantly reduced tumorigenicity and repressed cell proliferation compared to controls.
  • Bradykinin failed to induce IP3 production and PKC alpha/gamma translocation in gelsolin transfectants.
  • Bradykinin-induced PIP2 hydrolysis and PKC translocation were observed in parental and control cells but not in gelsolin-expressing cells.

Conclusions:

  • Gelsolin restoration suppresses lung cancer cell proliferation and tumorigenicity.
  • Gelsolin inhibits bradykinin-stimulated PLC/PKC signaling pathways, which are critical for cell growth and cancer development.

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