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Stat3 inhibits PTPN13 expression in squamous cell lung carcinoma through recruitment of HDAC5

Xiu-juan Han1, Li Xue, Li Gong

  • 1The Helmholtz Sino-German Research Laboratory for Cancer, Department of Pathology, Tangdu Hospital, The Fourth Military Medical University, Xi'an 710038, China.

Biomed Research International
|November 6, 2013
PubMed

Insights

This study reveals that Stat3 activation inhibits the tumor suppressor PTPN13 in lung cancer. This discovery uncovers a new molecular network involving Stat3 and PTPN13 in squamous cell lung carcinoma development.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Signaling

Background:

  • Protein tyrosine phosphatases (PTPs) regulate critical cellular functions.
  • PTPN13, a tumor suppressor, is often lost in lung carcinoma, but its regulation is unclear.
  • Interleukin-6 (IL-6) and Stat3 activation are implicated in tumor growth.

Purpose of the Study:

  • To investigate the molecular mechanisms of PTPN13 dysregulation in squamous cell lung carcinoma.
  • To explore the relationship between Stat3 signaling and PTPN13 expression.
  • To identify a novel molecular network controlling lung carcinoma development.

Main Methods:

  • Luciferase reporter assays to assess promoter activity.
  • Chromatin immunoprecipitation (ChIP) assays to detect Stat3 binding.
  • Analysis of PTPN13 mRNA transcription following IL-6 stimulation or Stat3 activation.

Main Results:

  • PTPN13 is a direct transcriptional target of Stat3 in squamous cell lung carcinoma.
  • IL-6 or activated Stat3 inhibits PTPN13 mRNA transcription.
  • Stat3 binds to the PTPN13 promoter and recruits HDAC5, influencing its activity.

Conclusions:

  • A novel Stat3-PTPN13 molecular network is identified.
  • This network plays a role in controlling squamous cell lung carcinoma development.
  • Understanding this pathway may offer new therapeutic targets for lung cancer.

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