Involvement of nitrosative stress in experimental periodontitis in diabetic rats

• Published in: Journal of clinical periodontology 2012-04, Vol.39 (4), p.342-349
• Main Authors: Nishikawa, Toru, Naruse, Keiko, Kobayashi, Yasuko, Miyajima, Shinichi, Mizutani, Makoto, Kikuchi, Takeshi, Soboku, Kyoko, Nakamura, Nobuhisa, Sokabe, Asako, Tosaki, Takahiro, Hata, Masaki, Ohno, Norikazu, Noguchi, Toshihide, Matsubara, Tatsuaki
• Format: Article
• Language: English
• Subjects: Animals; Biological and medical sciences; Dentistry; diabetes; Diabetes Mellitus, Experimental - complications; Diabetes Mellitus, Experimental - enzymology; Diabetes. Impaired glucose tolerance; Disease Models, Animal; Endocrine pancreas. Apud cells (diseases); Endocrinopathies; Enzyme Activation; Etiopathogenesis. Screening. Investigations. Target tissue resistance; Facial bones, jaws, teeth, parodontium: diseases, semeiology; inducible nitric oxide synthase; Male; Medical sciences; Nitric Oxide Synthase Type II - metabolism; nitrosative stress; nitrotyrosine; Non tumoral diseases; Otorhinolaryngology. Stomatology; Periodontitis; Periodontitis - complications; Periodontitis - enzymology; Rats; Rats, Sprague-Dawley; Reactive Nitrogen Species - metabolism; Streptozocin; Stress, Physiological; Tyrosine - analogs & derivatives; Tyrosine - genetics; Tyrosine - metabolism
• ISSN: 0303-6979; 1600-051X
• DOI: 10.1111/j.1600-051X.2011.01848.x

Aim 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. Results 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. Conclusions 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.