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mTOR-dependent transcriptional repression of Pdcd4 tumor suppressor in lung cancer cells

P N Vikhreva1, M V Shepelev1, I V Korobko1

  • 1Institute of Gene Biology, Russian Academy of Sciences, 34/5 Vavilov str., Moscow 119334, Russia.

Biochimica Et Biophysica Acta
|December 17, 2013
PubMed

Insights

Programmed cell death 4 (Pdcd4) is often lost in lung cancer. This study reveals mTOR signaling suppresses Pdcd4 transcription and protein levels, contributing to cancer progression.

Area of Science:

  • Molecular oncology
  • Cancer biology

Background:

  • Programmed cell death 4 (Pdcd4) is a crucial tumor suppressor frequently lost in various cancers, including lung cancer.
  • Loss of Pdcd4 function contributes significantly to tumor progression and malignancy.

Purpose of the Study:

  • To elucidate the molecular mechanisms responsible for Pdcd4 suppression in lung cancer cells.
  • To investigate the role of mTOR signaling in regulating Pdcd4 expression and stability.

Main Methods:

  • Analysis of Pdcd4 protein degradation pathways.
  • Investigation of transcriptional regulation of Pdcd4 by mTOR signaling.
  • Identification of cis-acting elements in the Pdcd4 promoter.

Main Results:

  • Pdcd4 protein undergoes enhanced mTOR-dependent proteasomal degradation in lung cancer cells.
  • mTOR signaling negatively regulates Pdcd4 transcription.
  • A specific cis-acting element within the Pdcd4 promoter mediates this transcriptional repression.

Conclusions:

  • A novel mechanism of Pdcd4 suppression in cancer involves mTOR signaling-dependent transcriptional repression.
  • This finding provides new insights into the molecular basis of lung cancer development and progression.
Keywords:
Lung cancer cellsPdcd4Transcriptional suppressionTumor suppressormTOR

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