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miRNA Expression Analyses in Prostate Cancer Clinical Tissues
11:29

miRNA Expression Analyses in Prostate Cancer Clinical Tissues

Published on: September 8, 2015

Hypoexpression and epigenetic regulation of candidate tumor suppressor gene CADM-2 in human prostate cancer

Guimin Chang1, Shuping Xu, Rajiv Dhir

  • 1Department of Urology, University of Pittsburgh, 5200 Centre Avenue, Pittsburgh, PA 15232, USA.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|November 11, 2010
PubMed
Abstract

Insights

Cell adhesion molecule 2a (CADM-2a) expression is significantly reduced in prostate cancer, potentially acting as a tumor suppressor. Its silencing is linked to promoter methylation, suggesting a new therapeutic target for prostate cancer.

Area of Science:

  • Molecular biology
  • Cancer research
  • Genetics

Background:

  • Cell adhesion molecules (CADM) are crucial for cell polarity and tumor suppression.
  • CADM-1, -3, and -4 are known tumor suppressors in prostate cancer.
  • CADM-2 expression in prostate cancer remains uncharacterized.

Purpose of the Study:

  • To characterize CADM-2 isoforms and their expression in prostate cancer.
  • To investigate the functional role of CADM-2 in prostate cancer cells.
  • To determine the regulatory mechanisms of CADM-2 expression.

Main Methods:

  • Cloning and characterization of CADM-2 isoforms (CADM-2a and CADM-2b).
  • Analysis of CADM-2 expression in prostate cell lines and clinical specimens using RT-PCR and immunohistochemistry.
  • Functional assays involving adenovirus-mediated CADM-2a expression.
  • Evaluation of CADM-2 promoter methylation via bisulfite sequencing and methylation-specific PCR.

Main Results:

  • CADM-2a and CADM-2b isoforms identified with distinct promoter activities.
  • Prostate cancer cell lines showed negligible CADM-2a expression compared to normal tissues.
  • Significant CADM-2a downregulation observed in prostate carcinoma specimens (P < 0.001).
  • CADM-2a expression suppressed prostate cancer cell proliferation and colony formation in vitro.
  • Decreased CADM-2a mRNA levels correlated with promoter hypermethylation.
  • Demethylating agents reactivated CADM-2a expression.

Conclusions:

  • CADM-2a expression is significantly reduced in prostate cancer.
  • Promoter methylation is a key regulatory mechanism for CADM-2a silencing.
  • CADM-2a functions as a novel tumor suppressor in a subset of prostate cancers.

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