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KLF4 downregulates hTERT expression and telomerase activity to inhibit lung carcinoma growth

Wenxian Hu1, Yunlu Jia1, Xiangsheng Xiao2

  • 1Department of Surgical Oncology, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, China.

Oncotarget
|May 7, 2016
PubMed

Insights

Krüppel-like factor 4 (KLF4) suppresses lung cancer by inhibiting human telomerase reverse transcriptase (hTERT) and MAPK signaling. This discovery reveals a new therapeutic target for lung cancer treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • Krüppel-like factor 4 (KLF4) has a dual role in cancer, acting as a tumor suppressor or oncogene.
  • The precise mechanism of KLF4's tumor suppressive function in lung cancer requires further elucidation.

Purpose of the Study:

  • To investigate the regulatory mechanism of KLF4 in lung cancer.
  • To determine the relationship between KLF4, hTERT, and the MAPK signaling pathway in lung cancer.

Main Methods:

  • Utilized lung cancer cell lines and a mouse model.
  • Performed promoter reporter assays and chromatin immunoprecipitation (ChIP).
  • Analyzed KLF4 and hTERT expression in patient samples.

Main Results:

  • KLF4 negatively regulated human telomerase reverse transcriptase (hTERT) expression and telomerase activity.
  • KLF4 directly bound to the hTERT promoter region.
  • KLF4 suppressed lung cancer cell proliferation and tumor formation in vivo.
  • The MAPK signaling pathway was implicated in KLF4/hTERT modulation.

Conclusions:

  • KLF4 inhibits lung cancer growth by suppressing hTERT and MAPK signaling.
  • The KLF4/hTERT/MAPK pathway represents a potential therapeutic target for lung cancer.
Keywords:
KLF4MAPKcancer prognosishTERTlung cancer

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