Mechanical stimulation of gingiva reduces plasma 8-OHdG level in rat periodontitis.
OBJECTIVE
Gingival cells respond to periodontal pathogens by generating reactive oxygen species, and such a condition would increase circulating oxidative stress. Improvement of gingival inflammation by toothbrushing may offer clinical benefits on not only periodontal health but also the circulatory conditions. We examined the effects of mechanical stimulation on the plasma 8-hydroxydeoxyguanosine level in a rat periodontitis model.


METHODS
In this experiment, male Wistar rats (n=18) were divided into three groups. The control group received topical application of pyrogen-free water to the gingival sulcus for 8 weeks, while the other two groups received topical application of bacterial pathogens (lipopolysaccharide and proteases). After 4 weeks, half of the rats in the experimental groups received daily mechanical stimulation with an electric toothbrush for 4 weeks.


RESULTS
Rats treated with bacterial pathogens presented periodontal tissue damage and increased plasma levels of 8-hydroxydeoxyguanosine. Mechanical stimulation by toothbrushing decreased gingival inflammation and oxidative DNA damage indicated by a decrease in plasma 8-hydroxydeoxyguanosine.


CONCLUSIONS
Mechanical stimulation of periodontally involved gingiva reduced 8-hydroxydeoxyguanosine in plasma and may contribute to a reduction in circulating oxidative stress associated molecules.
Ekuni
Daisuke
D
Department of Oral Health, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Okayama 700-8525, Japan.
Tomofuji
Takaaki
T
Tamaki
Naofumi
N
Sanbe
Toshihiro
T
Azuma
Tetsuji
T
Yamanaka
Reiko
R
Yamamoto
Tatsuo
T
Watanabe
Tatsuo
T
D000080242:8-Hydroxy-2'-Deoxyguanosine; D000818:Animals; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000097:blood / Q000378:metabolism; D004195:Disease Models, Animal; D005881:Gingiva / Q000378:metabolism* / Q000473:pathology; D008297:Male; D018384:Oxidative Stress; D010518:Periodontitis / Q000097:blood* / Q000378:metabolism / Q000473:pathology; D010812:Physical Stimulation / Q000379:methods; D051381:Rats; D017208:Rats, Wistar; D017382:Reactive Oxygen Species / Q000378:metabolism; D014099:Toothbrushing
D017382:Reactive Oxygen Species; D000080242:8-Hydroxy-2'-Deoxyguanosine; D003849:Deoxyguanosine