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Deficient Pms2, ERCC1, Ku86, CcOI in Field Defects During Progression to Colon Cancer
28:15

Deficient Pms2, ERCC1, Ku86, CcOI in Field Defects During Progression to Colon Cancer

Published on: July 29, 2010

Decreased expression of DNA-dependent protein kinase, a DNA repair protein, during human colon carcinogenesis

B Rigas1, S Borgo, A Elhosseiny

  • 1American Health Foundation, Valhalla, New York 10595, USA.

Cancer Research
|December 4, 2001
PubMed

Insights

DNA-dependent protein kinase (DNA-PK) components Ku70 and Ku86 are significantly reduced in colon adenomas and carcinomas. This underexpression may play a crucial role in colon cancer development.

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • DNA-dependent protein kinase (DNA-PK) is vital for DNA double-strand break (DSB) repair.
  • The DNA-PK complex comprises DNA-PKcs, Ku70, and Ku86 proteins.

Purpose of the Study:

  • To investigate the expression levels of DNA-PK components in normal colon tissue, adenomas, and carcinomas.
  • To determine the potential role of DNA-PK expression changes in colon cancer development.

Main Methods:

  • Immunohistochemical assessment of DNA-PKcs, Ku70, and Ku86 expression in human colon tissues.
  • Quantitative analysis of protein expression intensity and cellular distribution.

Main Results:

  • Normal colonocytes express all DNA-PK proteins.
  • Ku70 expression was significantly reduced in adenomas and carcinomas compared to normal tissue.
  • Ku86 expression was also significantly decreased in adenomas and carcinomas.
  • DNA-PKcs expression showed no significant change across the different tissue types.

Conclusions:

  • Marked underexpression of Ku70 and Ku86 begins at the adenoma stage.
  • The reduced expression of Ku70 and Ku86 may be a critical factor in the pathogenesis of colon cancer.

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