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Involvement of nitrosative stress in experimental periodontitis in diabetic rats


  • Conflict of interest and source of funding

  • The authors declare that they have no conflict of interests.

    This research was supported in part by the Grant-in-Aid for Scientific Research (18592271 and 22592322) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) and in part by the “Strategic Research AGU-Platform Formation (2008–2012)” Project for Private Universities: matching fund subsidy from MEXT of Japan.


Keiko Naruse

Department of Internal Medicine, School of Dentistry, Aichi-Gakuin University,

2-11 Suemori-dori, Chikusa-ku, Nagoya 464-8651, Japan




Periodontal disease is highly prevalent and severe in diabetic patients, and is considered one of the diabetic complications. To elucidate how periodontitis progresses in diabetes, we examined an animal model of periodontitis in diabetic rats.

Materials and Methods

Two weeks after the induction of diabetes by streptozotocin, surgical nylon thread was ligated around the cervical portion of the unilateral maxillary second molar to induce periodontitis. Periodontitis was evaluated 2 weeks after the ligation by gingival blood flow, mRNA expressions, Western blot analysis, histological examination and micro CT.


Ligation-induced severe periodontitis in the diabetic rats, which was apparently shown by the increase of TNF-α and iNOS mRNA expressions and inflammatory cell infiltration in the gingiva and alveolar bone loss. The number of nitrotyrosine, a footprint of nitrosative stress, -positive cells was significantly higher in the periodontitis of the diabetic rats compared with that in the normal rats. Western blot analysis confirmed that the nitrotyrosine was increased in the periodontitis of the diabetic rats.


This is the first study to confirm increased nitrosative stress due to periodontitis in diabetic rats. Nitrosative stress may play a crucial role in the exacerbation of periodontitis in diabetic patients.

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