TY - JOUR
T1 - Intermittent local periodontal inflammation causes endothelial dysfunction of the systemic artery via increased levels of hydrogen peroxide concomitantly with overexpression of superoxide dismutase
AU - Yamamoto, Yasuhiro
AU - Saito, Takumi
AU - Feng, Guo Gang
AU - Li, Jiazheng
AU - Yasuda, Yoshitaka
AU - Kazaoka, Yoshiaki
AU - Fujiwara, Yoshihiro
AU - Kinoshita, Hiroyuki
N1 - Publisher Copyright:
© 2016 Elsevier Ireland Ltd
PY - 2016/11/1
Y1 - 2016/11/1
N2 - Background The present study was designed to examine whether the intermittent local periodontal inflammation induces endothelial dysfunction of the systemic artery caused by oxidative stress and if increased levels of hydrogen peroxide coexisted with overexpression of superoxide dismutase (SOD) as well as NADPH oxidase contribute to the oxidative stress. Methods The rats in lipopolysaccharides (LPS) group received 1500 μg LPS injection to bilateral gingiva of the lower jaw a week interval from eight- to eleven-week-old. Isolated mandibles or aortas were subjected to the evaluation of histopathological changes, isometric force recordings, reactive oxygen species using 2′,7′-dichlorofluorescin diacetate (10− 5 mol/L) and protein expression of NADPH oxidase subunits and SOD, respectively. Results Mandible sections demonstrated the periodontal inflammation only in the LPS group at three days, but not seven days, after the LSP injection. Acetylcholine (10− 9 to 10− 5 mol/L)-induced relaxation was reduced only in aortas from the LPS group. Gp91ds-tat and PEG-catalase restored the impaired dilation in arteries from the LPS group. Levels of reactive oxygen species were enhanced in aortas from the LPS group, whereas the increment was abolished by the treatment with gp91-ds-tat or PEG-catalase. Expression of a NADPH oxidase subunit p47phox and CuZn-SOD increased in the LPS group. Conclusions The intermittent local periodontal inflammation induces systemic endothelial dysfunction caused by overproduction of reactive oxygen species in the systemic artery of rats and that overexpression of CuZn-SOD as well as a NADPH oxidase cytosolic subunit contributes to increased levels of hydrogen peroxide in blood vessels of this animal model.
AB - Background The present study was designed to examine whether the intermittent local periodontal inflammation induces endothelial dysfunction of the systemic artery caused by oxidative stress and if increased levels of hydrogen peroxide coexisted with overexpression of superoxide dismutase (SOD) as well as NADPH oxidase contribute to the oxidative stress. Methods The rats in lipopolysaccharides (LPS) group received 1500 μg LPS injection to bilateral gingiva of the lower jaw a week interval from eight- to eleven-week-old. Isolated mandibles or aortas were subjected to the evaluation of histopathological changes, isometric force recordings, reactive oxygen species using 2′,7′-dichlorofluorescin diacetate (10− 5 mol/L) and protein expression of NADPH oxidase subunits and SOD, respectively. Results Mandible sections demonstrated the periodontal inflammation only in the LPS group at three days, but not seven days, after the LSP injection. Acetylcholine (10− 9 to 10− 5 mol/L)-induced relaxation was reduced only in aortas from the LPS group. Gp91ds-tat and PEG-catalase restored the impaired dilation in arteries from the LPS group. Levels of reactive oxygen species were enhanced in aortas from the LPS group, whereas the increment was abolished by the treatment with gp91-ds-tat or PEG-catalase. Expression of a NADPH oxidase subunit p47phox and CuZn-SOD increased in the LPS group. Conclusions The intermittent local periodontal inflammation induces systemic endothelial dysfunction caused by overproduction of reactive oxygen species in the systemic artery of rats and that overexpression of CuZn-SOD as well as a NADPH oxidase cytosolic subunit contributes to increased levels of hydrogen peroxide in blood vessels of this animal model.
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U2 - 10.1016/j.ijcard.2016.08.099
DO - 10.1016/j.ijcard.2016.08.099
M3 - Article
C2 - 27526356
AN - SCOPUS:84981298095
SN - 0167-5273
VL - 222
SP - 901
EP - 907
JO - International Journal of Cardiology
JF - International Journal of Cardiology
ER -