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Radiation-induced posttranscriptional control of M6P/IGF2r expression in breast cancer cell lines

Keisuke S Iwamoto1, Chad L Barber

  • 1Roy E. Coats Research Laboratories, Department of Radiation Oncology, David Geffen School of Medicine at UCLA, University of California-Los Angeles, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA.

Molecular Carcinogenesis
|February 14, 2007
PubMed

Insights

Ionizing radiation rapidly increases mannose 6-phosphate/insulin-like growth factor 2 receptor (M6P/IGF2r) expression in breast cancer cells. This occurs via transcript stabilization, highlighting posttranscriptional control in cancer therapy response.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • The mannose 6-phosphate/insulin-like growth factor 2 receptor (M6P/IGF2r) acts as a tumor suppressor and negative regulator of cell growth.
  • Reduced M6P/IGF2r expression is linked to breast cancer development and progression.
  • Understanding M6P/IGF2r regulation is crucial for breast cancer research and treatment.

Purpose of the Study:

  • To investigate the effect of ionizing radiation on M6P/IGF2r expression in human breast cancer cells.
  • To elucidate the regulatory mechanisms underlying radiation-induced changes in M6P/IGF2r levels.
  • To explore the role of posttranscriptional regulation in M6P/IGF2r modulation by radiation.

Main Methods:

  • Utilized MCF7 human breast cancer cells to study M6P/IGF2r expression following ionizing radiation exposure.
  • Examined M6P/IGF2r transcript levels in both estrogen receptor-positive (MCF7, T47D) and estrogen receptor-negative (MDA-MB-231) cell lines.
  • Assessed the impact of radiation on M6P/IGF2r transcript stability.

Main Results:

  • Ionizing radiation induced a rapid, dose-dependent increase in M6P/IGF2r expression in MCF7 cells.
  • Radiation exposure led to the stabilization of M6P/IGF2r transcripts in both ER-positive and ER-negative breast cancer cell lines.
  • These findings suggest a significant role for posttranscriptional mechanisms in regulating M6P/IGF2r following radiation.

Conclusions:

  • Posttranscriptional dysregulation of M6P/IGF2r is implicated in breast cancer pathogenesis and response to therapy.
  • Radiation-induced stabilization of M6P/IGF2r transcripts represents a novel mechanism of gene expression control.
  • This study emphasizes the importance of posttranscriptional regulation in radiation-induced gene expression, challenging traditional transcriptional control paradigms.

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