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Expression of voltage-gated potassium channels in human and mouse colonic carcinoma

Jiraporn Ousingsawat1, Melanie Spitzner, Supaporn Puntheeranurak

  • 1Institut für Physiologie, Universität Regensburg, Regensburg, Germany, and Institute for Pathology, University Hospital Basel, Basel, Switzerland.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|February 10, 2007
PubMed
Abstract

Insights

Voltage-gated potassium (Kv) channels, including ether-a-go-go (EAG) channels, are implicated in colon cancer development. Enhanced Eag-1 expression and amplification suggest these channels are potential therapeutic targets for colorectal adenocarcinoma.

Area of Science:

  • Molecular biology
  • Oncology
  • Channelopathies

Background:

  • Voltage-gated Kv potassium channels, such as ether-a-go-go (EAG) channels, are known for their role in various cancers.
  • Their specific involvement in colonic cancer requires further investigation.

Purpose of the Study:

  • To investigate the expression and role of Kv channels in colonic cancer.
  • To determine if Kv channels, particularly Eag-1, are associated with colorectal adenocarcinoma development and prognosis.

Main Methods:

  • Examined Kv channel expression in human colonic cancers and chemically induced mouse models.
  • Utilized multiplex reverse transcription-PCR to analyze mRNA expression.
  • Detected Eag-1 protein and analyzed genomic amplification in human colorectal adenocarcinoma.

Main Results:

  • Kv channels, especially Eag-1, were upregulated during colon carcinogenesis.
  • Increased mRNA expression of Kv1.3, Kv1.5, Kv3.1, and Eag channel family members was observed.
  • Eag-1 protein was present in malignant tissues, and its genomic amplification was an independent marker of poor prognosis in colorectal adenocarcinoma.

Conclusions:

  • Kv and Eag channels play an oncogenic role in colonic cancer development.
  • These channels represent a promising target for novel colorectal cancer pharmacotherapy.

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