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Identification of PAK4 as a putative target gene for amplification within 19q13.12-q13.2 in oral squamous-cell

Asma Begum1, Issei Imoto, Ken-ichi Kozaki

  • 1Department of Molecular Cytogenetics, Medical Research Institute and School of Biomedical Science, Tokyo Medical and Dental University, Tokyo, Japan.

Cancer Science
|July 15, 2009
PubMed

Insights

Amplification of the PAK4 gene promotes oral squamous cell carcinoma (OSCC) proliferation. PAK4 overexpression is linked to poorer prognosis, suggesting it as a potential diagnostic and therapeutic target for OSCC.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Chromosomal DNA amplification can activate cancer-related genes in tumors.
  • Specific DNA copy-number aberrations in the 19q13.12-q13.2 region were previously identified in oral squamous cell carcinoma (OSCC) cell lines.

Purpose of the Study:

  • To identify the specific gene targeted for amplification in the 19q13.12-q13.2 region in OSCC.
  • To investigate the role of candidate genes in OSCC proliferation and prognosis.

Main Methods:

  • Genome-wide screening for DNA copy-number aberrations.
  • Analysis of gene expression in OSCC cell lines and normal oral epithelial cells.
  • Gene knockdown experiments to evaluate growth-suppressive effects.
  • Immunohistochemical analysis of PAK4 expression in primary head and neck squamous cell carcinoma (HNSCC) and OSCC tumors.

Main Results:

  • The p21-activated kinase 4 (PAK4) gene was identified as the most likely amplification target within the 19q13.12-q13.2 region.
  • PAK4 showed remarkable overexpression in OSCC cell lines compared to normal cells.
  • PAK4 overexpression was significantly associated with a poorer prognosis in HNSCC and OSCC patients.

Conclusions:

  • PAK4 overexpression, potentially due to amplification, promotes OSCC cell proliferation and/or survival.
  • PAK4 represents a promising diagnostic and/or therapeutic target for OSCC.

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