RESUMEN
Objective:To evaluate the effects of rosiglitazone (ROS) on the expression of adiponectin receptors (AdipoR1 and AdipoR2) mRNA in gingival tissue and inflammatory factors,and on the potential of bone loss in the rats with experimental periodontitis.Methods:10 male Sprague-Dawley rats without treatment were used as the controls;40 were used for the creation of periodontis models and then treated by rosiglitazone at 0(periodontitis control),1,3,10 mg/kg(low,median and high dose groups) respectively 1/d for 4 weeks.RT-PCR was used to examine the expression of AdipoR1 and AdipoR2 mRNA in gingiva tissue.Levels of gingival TNF-α,MMP-9 and plasma adiponectin was measured by ELISA.CEJ-A was measured for the evaluation of alveolar bone loss by standard digital photographs.Results:The expression levels of gingival AdipoRl and AdipoR2 mRNA in periodontitis group is lower than that in the control group(P ＜ 0.01).The concentration of plasma adiponectin had no significant difference between control group and periodontitis group(P ＞ 0.05).The concentration of gingival TNF-α,MMP-9 in periodontitis group was significantly higher than that in control group (P ＜ 0.01).Compared with periodontitis group,ROS treatment increased the expression levels of AdipoR1 mRNA(P ＜ 0.05)and decreased the concentration of TNF-α in gingival tissue.Median and high dose treatment increased the expression levels of AdipoR2 (P ＜ 0.01) and the concentration of plasma adiponectin(P ＜ 0.05),decreased the concentration of MMP-9 in gingival tissue (P ＜ 0.01)and the alveolar bone loss(P ＜ 0.01).Conclusion:Rosiglitazone treatment may reduce inflammatory response and suppress the bone resorption probably through up-regulation of the expression of adiponectin receptors and decrease of the concentration of TNF-α,MMP-9 in gingival tissue.