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Suppression of lung adenocarcinoma through menin and polycomb gene-mediated repression of growth factor pleiotrophin

S-B Gao1, Z-J Feng, B Xu

  • 1Department of Basic Medical Sciences, Medical College, Xiamen University, Xiamen 361005, Fujian, PR China.

Oncogene
|September 15, 2009
PubMed

Insights

Menin suppresses lung cancer by repressing pleiotrophin (PTN) transcription. This epigenetic regulation involves enhancing H3K27 methylation, offering a new therapeutic target for lung adenocarcinoma.

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • Menin's role in endocrine tumor suppression is known, but its mechanism in non-endocrine tumors like lung cancer is unclear.
  • Lung adenocarcinoma often involves activated anaplastic lymphoma kinase (ALK) signaling.
  • Reduced menin expression is observed in primary human lung adenocarcinomas.

Purpose of the Study:

  • To investigate the role of menin in suppressing lung cancer.
  • To elucidate the molecular mechanisms by which menin inhibits lung cancer cell proliferation and tumor growth.
  • To identify novel therapeutic targets in lung adenocarcinoma based on menin's function.

Main Methods:

  • Assessed menin's effect on human lung cancer cell proliferation and mouse lung cancer growth.
  • Investigated menin's regulation of pleiotrophin (PTN) transcription and PTN-induced proliferation.
  • Examined menin's interaction with the PTN locus and its influence on histone methylation (H3K27me3 and H3K4me3) via EZH2.

Main Results:

  • Menin inhibits human lung cancer cell proliferation and mouse lung cancer growth.
  • Menin represses PTN transcription and PTN-driven proliferation.
  • Menin enhances EZH2-mediated H3K27 trimethylation at the PTN locus, suppressing its transcription.

Conclusions:

  • Menin suppresses lung cancer through epigenetic repression of PTN transcription via H3K27 methylation.
  • This study reveals a novel, epigenetically regulated PTN-ALK signaling pathway in lung cancer suppression.
  • Targeting menin-mediated epigenetic regulation of PTN offers a potential therapeutic strategy for lung adenocarcinoma.

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