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Nitric oxide inhibits irreversibly P815 cell proliferation: involvement of potassium channels

R S A Costa1, J Assreuy

  • 1Department of Pharmacology, Center of Biological Sciences, Universidade Federal de Santa Catarina, Brazil.

Cell Proliferation
|November 13, 2002
PubMed

Insights

Nitric oxide (NO) irreversibly inhibits cancer cell proliferation by activating potassium channels, halting cell division during mitosis. This effect is independent of guanylate cyclase signaling.

Area of Science:

  • Cell Biology
  • Cancer Research
  • Molecular Pharmacology

Background:

  • Nitric oxide (NO) is known to regulate cellular processes, including proliferation in both normal and cancerous cells.
  • Potassium channels play a crucial role in cell cycle progression and proliferation.
  • NO has been reported to activate certain types of potassium channels.

Purpose of the Study:

  • To investigate the effect of nitric oxide (NO) on the proliferation of murine mastocytoma cells (P815 cell line).
  • To determine the involvement of potassium channels in NO-mediated inhibition of cell proliferation.
  • To elucidate the specific signaling pathways, including guanylate cyclase, involved in this process.

Main Methods:

  • Utilized NO donors to treat P815 murine mastocytoma cells.
  • Assessed cell proliferation and cell cycle phase distribution (mitosis).
  • Examined the effect of blocking various potassium channels (voltage-dependent, calcium-dependent, ATP-dependent) on NO's inhibitory action.
  • Investigated the role of guanylate cyclase and cytoskeleton integrity.

Main Results:

  • NO donors induced a dose-dependent inhibition of P815 cell proliferation.
  • NO treatment led to growth arrest specifically in the mitosis phase.
  • The inhibitory effect of NO was irreversible, showing similar results after 4 or 24 hours of incubation.
  • Blockade of voltage- and calcium-dependent potassium channels completely prevented NO's inhibitory effect.
  • ATP-dependent potassium channels and guanylate cyclase were not involved in NO's anti-proliferative action.

Conclusions:

  • Nitric oxide irreversibly inhibits murine mastocytoma cell proliferation.
  • The anti-proliferative effect of NO is mediated through the activation of voltage- and calcium-dependent potassium channels.
  • This mechanism operates independently of guanylate cyclase and cytoskeleton disruption.

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