DNA repair and mutagen sensitivity of epithelial cells and lymphocytes in oropharyngeal cancer

Reiter,Maximilian; Baumeister,Philipp; Jaiser,Sonja; Reiss,Andreas; Schwenk-Zieger,Sabina; Kleinsasser,Norbert; Harréus,Ulrich

doi:10.3892/ol.2011.417

DNA repair and mutagen sensitivity of epithelial cells and lymphocytes in oropharyngeal cancer

Authors:
- Maximilian Reiter
- Philipp Baumeister
- Sonja Jaiser
- Andreas Reiss
- Sabina Schwenk-Zieger
- Norbert Kleinsasser
- Ulrich Harréus
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Affiliations: Department of Otorhinolaryngology and Head and Neck Surgery, Grosshadern Clinic, Ludwig Maximilians University, D-81377 Munich, Germany, Department of Otorhinolaryngology and Head and Neck Surgery, Julius Maximilians University, D-97080 Wuerzburg, Germany, Department of Otolaryngology and Head and Neck Surgery, Friedrich Alexander University, D-91054 Erlangen, Germany
Published online on: September 9, 2011 https://doi.org/10.3892/ol.2011.417
Pages: 100-106

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Abstract

Tobacco-associated nitrosamines are known carcinogens causing DNA damage in epithelial cells of the head and neck. A matched case-control study was performed to evaluate the sensitivity of patients with squamous cell cancer (SCC) of the oropharynx, and controls to tobacco-associated nitrosamines. Quantitative DNA repair was evaluated following a period of 15 and 30 min. Fresh biopsies from 100 male donors of macroscopically healthy oropharyngeal cells and lymphocytes (50 SCC patients and 50 controls) were incubated with N-nitrosodiethylamine (NDEA), 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) or N-nitrosonornicotine (NNN). DNA damage in epithelial cells and lymphocytes was assessed using the comet assay. Following incubation with NDEA, cells underwent a period of DNA repair. All of the nitrosamines caused equivalent genotoxic damage in mucosal cells and lymphocytes of the two groups. Lymphocyte DNA repair capacity in the control group (26.8 and 37.1% after 15 and 30 min) was comparable to the tumor group (23.6 and 40.6%). However, epithelial cell DNA repair capacity of carcinoma patients was significantly reduced to 17.1% (15 min) and 23% (30 min) compared to the DNA repair of the control group (36.2%, 15 min and 46.0%, 30 min). Mutagen sensitivity was comparable in patients and controls. Thus, reduced epithelial cell DNA repair capacity of tumor patients is a possible endogenous risk factor for the development of head and neck squamous cell cancer.

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