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Kv3.4 potassium channel-mediated electrosignaling controls cell cycle and survival of irradiated leukemia cells

Daniela Palme1, Milan Misovic, Evi Schmid

  • 1Department of Radiation Oncology, University of Tübingen, Hoppe-Seyler-Str. 3, 72076, Tübingen, Germany.

Pflugers Archiv : European Journal of Physiology
|February 28, 2013
PubMed

Insights

Voltage-gated potassium channels (Kv) are crucial for leukemia cell radioresistance. Inhibiting Kv channels increases apoptosis and reduces survival after radiation therapy, offering new therapeutic targets.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Aberrant ion channel expression is linked to cancer development and therapy resistance.
  • The role of specific ion channels in leukemia radioresistance remains largely undefined.

Purpose of the Study:

  • To investigate the function of voltage-gated potassium channels in the radioresistance of leukemia cells.
  • To determine the signaling pathways influenced by these channels upon irradiation.

Main Methods:

  • Quantitative reverse transcriptase-polymerase chain reaction for gene expression.
  • Patch-clamp recording for ion channel activity.
  • Fura-2 Ca(2+)-imaging for calcium signaling.
  • Immunoblotting for protein analysis.
  • Flow cytometry and clonogenic survival assays for cell cycle and survival.

Main Results:

  • Ionizing radiation induced G2/M arrest, preceded by activation of Kv3.4-like channels.
  • Kv channel activation enhanced Ca(2+) entry, activating Ca(2+)/calmodulin-dependent kinase-II and inactivating cdc25B and cdc2.
  • Inhibition or downregulation of Kv channels released cells from G2/M arrest, increased apoptosis, and reduced clonogenic survival.

Conclusions:

  • Voltage-gated potassium channels play a significant functional role in myeloid leukemia cell radioresistance.
  • Targeting these channels may represent a viable strategy to enhance radiotherapy efficacy in leukemia.

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