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miR-214 and hypoxia down-regulate Necl-2/CADM1 and enhance ErbB2/ErbB3 signaling

Kenji Momose1, Akihiro Minami, Yohei Shimono

  • 1Division of Molecular and Cellular Biology, Department of Biochemistry and Molecular Biology, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, 650-0017, Japan.

Genes to Cells : Devoted to Molecular & Cellular Mechanisms
|January 11, 2013
PubMed

Insights

Necl-2 (cell adhesion molecule 1) is suppressed by miR-214 and hypoxia in colon cancer. These factors enhance ErbB2/ErbB3 signaling, contributing to cancer progression.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Necl-2/CADM1 acts as a tumor suppressor, but its down-regulation via methylation or LOH occurs in 30-60% of cancers.
  • Necl-2 interacts with ErbB3 to suppress ErbB2/ErbB3 signaling, impacting cell movement and death.
  • Investigating alternative mechanisms for Necl-2 down-regulation is crucial for understanding cancer development.

Purpose of the Study:

  • To identify novel mechanisms that down-regulate Necl-2 expression in cancer.
  • To investigate the role of miR-214 and hypoxia in Necl-2 regulation.
  • To determine the impact of Necl-2 down-regulation on ErbB2/ErbB3 signaling.

Main Methods:

  • Target validation of Necl-2 3'UTR by miR-214 using human colon cancer Caco-2 cells.
  • Assessment of Necl-2 protein levels under hypoxic conditions.
  • Analysis of ErbB2/ErbB3 signaling pathway activation.

Main Results:

  • miR-214 directly targets Necl-2 mRNA's 3'UTR, suppressing its translation and enhancing ErbB2/ErbB3 signaling.
  • Hypoxia reduces Necl-2 protein levels independently of miR-214 or HIF-1α.
  • Both miR-214 and hypoxia contribute to Necl-2 down-regulation and subsequent enhancement of ErbB2/ErbB3 signaling.

Conclusions:

  • miR-214 and hypoxia are identified as novel regulators that down-regulate Necl-2.
  • These regulatory mechanisms enhance ErbB2/ErbB3 signaling, potentially promoting cancer progression.
  • Understanding these pathways offers new therapeutic targets for cancers with Necl-2 abnormalities.

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