Role of activation-induced cytidine deaminase in the development of oral squamous cell carcinoma

PLoS One. 2013 Apr 25;8(4):e62066. doi: 10.1371/journal.pone.0062066. Print 2013.

Abstract

Purpose: In humans, activation-induced cytidine deaminase (AID) expression results due to inflammation and this deaminase activity is also involved in carcinogenesis. The aim of this study is to investigate the correlation between AID expression and the clinical classification of oral cancer tissues.

Experimental design: The current study investigated the correlation between AID expression and the clinical classification of oral cancer tissues from 27 patients who underwent surgical resection using immunohistochemistry. Specific AID expression and its induction by cytokine stimulation were investigated in cultured HSC oral cancer cell lines by reverse transcriptase PCR.

Results: AID expression was detected in 10 of 27 specimens (37.0%). AID expression was more frequently detected in early-stage cancer, especially in early stage T, than in late-stage cancer (T1/T2 vs. T3/4; P = 0.0493, N0 vs. N1/2/3; P = 0.0793). HSC-2, a nonmetastatic oral cancer cell line, abundantly expressed endogenous AID, whereas no such expression was observed in HSC-3, a metastatic oral cancer cell line. Moreover, AID expression was substantially induced in HSC-2 cells by stimulation of an inflammation-related cytokine, TNF-α.

Conclusions: Aberrant AID expression in the oral epithelium would contribute to the initiation of oral squamous cell carcinoma. Avoiding persistent AID inducible condition such as frequent cleaning of oral cavity would play an important role for the prevention of developing oral cancer.

MeSH terms

  • Carcinoma, Squamous Cell / enzymology*
  • Carcinoma, Squamous Cell / pathology*
  • Cell Line, Tumor
  • Cytidine Deaminase / genetics
  • Cytidine Deaminase / metabolism*
  • Humans
  • Keratins / metabolism
  • Mouth Neoplasms / enzymology*
  • Mouth Neoplasms / pathology*
  • Neoplasm Staging
  • Tumor Necrosis Factor-alpha / pharmacology
  • Up-Regulation / drug effects

Substances

  • Tumor Necrosis Factor-alpha
  • Keratins
  • AICDA (activation-induced cytidine deaminase)
  • Cytidine Deaminase

Grants and funding

The authors have no support or funding to report.