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DLEC1, a 3p tumor suppressor, represses NF-κB signaling and is methylated in prostate cancer

Lian Zhang1, Qian Zhang, LiLi Li

  • 1Department of Urology, National Research Center for Genitourinary Oncology, Peking University First Hospital and Institute of Urology, Beijing, China.

Journal of Molecular Medicine (Berlin, Germany)
|February 5, 2015
PubMed
Abstract

Insights

Deleted in lung and esophageal cancer 1 (DLEC1) is frequently methylated in prostate cancer, acting as a tumor suppressor. This epigenetic alteration is linked to cancer progression and may serve as a diagnostic biomarker.

Area of Science:

  • Oncology
  • Epigenetics
  • Molecular Biology

Background:

  • Deleted in lung and esophageal cancer 1 (DLEC1) is implicated in various cancers, but its role in prostate cancer (PrCa) is not well-defined.
  • Epigenetic modifications, particularly promoter methylation, are crucial in cancer development and progression.
  • Understanding the function and regulation of DLEC1 in PrCa is essential for identifying new diagnostic and therapeutic targets.

Purpose of the Study:

  • To investigate the epigenetic alteration of DLEC1 in prostate cancer.
  • To elucidate the functional role of DLEC1 as a tumor suppressor in PrCa.
  • To evaluate DLEC1 methylation as a potential biomarker for PrCa diagnosis and prognosis.

Main Methods:

  • Analysis of DLEC1 expression and promoter methylation in PrCa cell lines and tissues.
  • Pharmacologic demethylation to assess DLEC1 re-expression.
  • Functional assays including colony formation, apoptosis, and migration assays in PrCa cells.
  • Detection of DLEC1 methylation in urine sediment samples from PrCa patients.
  • Investigation of DLEC1's effect on NF-κB signaling pathway.

Main Results:

  • DLEC1 is highly expressed in normal prostate tissues but frequently downregulated by promoter methylation in PrCa.
  • Pharmacologic demethylation restored DLEC1 expression, confirming methylation's role.
  • DLEC1 methylation was significantly associated with higher PSA levels, Gleason scores, and advanced tumor stages.
  • DLEC1 methylation was detected in urine samples of PrCa patients, distinguishing them from BPH patients.
  • Ectopic DLEC1 expression inhibited PrCa cell growth, induced apoptosis, suppressed migration, and inhibited NF-κB activity.

Conclusions:

  • DLEC1 functions as a tumor suppressor in prostate cancer.
  • Frequent promoter methylation of DLEC1 in PrCa is linked to disease progression.
  • DLEC1 methylation serves as a potential non-invasive epigenetic biomarker for PrCa diagnosis.
  • DLEC1 suppresses PrCa growth and metastasis, partly through the NF-κB signaling pathway.

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