目的:探讨鸢尾素调节Janus蛋白酪氨酸激酶2(Janus protein tyrosine kinase 2,JAK2)/信号转导和转录激活子3(Signal transduction and activator of transcription 3,STAT3)信号通路对牙周炎大鼠牙周组织损伤的影响。方法:通过结扎和接...目的:探讨鸢尾素调节Janus蛋白酪氨酸激酶2(Janus protein tyrosine kinase 2,JAK2)/信号转导和转录激活子3(Signal transduction and activator of transcription 3,STAT3)信号通路对牙周炎大鼠牙周组织损伤的影响。方法:通过结扎和接种牙龈卟啉单胞菌液建立牙周炎大鼠模型,将大鼠随机分为模型组、鸢尾素低(鸢尾素-L,50 mg/kg)、中(鸢尾素-M,100 mg/kg)、高剂量(鸢尾素-H,200 mg/kg)组、鸢尾素-H+激活剂(200 mg/kg鸢尾素+2 mg/kg香豆霉素)组,每组10只,并以注射等体积生理盐水的正常大鼠对照组。干预结束后,对大鼠牙龈出血指数、牙齿松动度评分;牙槽骨吸收、肿瘤坏死因子-α(Tumor necrosis factor-α,TNF-α)、白细胞介素(Interleukin,IL)-6、IL-1β以及丙二醛(Malondialdehyde,MDA)、超氧化物歧化酶(Superoxide dismutase,SOD)水平分别以Micro-CT试剂盒检测;HE检测牙周组织病理学变化;Western blot检测JAK2、STAT3、p-JAK2、p-STAT3蛋白表达。结果:与对照组相比,模型组大鼠牙周组织被破坏,炎性浸润严重,牙龈出血指数、牙齿松动度评分、牙槽骨吸收、TNF-α、IL-6、IL-1β、MDA水平、p-JAK2/JAK2、p-STAT3/STAT3表达显著增加,SOD水平显著降低(P<0.05);与模型组相比,不同剂量的鸢尾素组大鼠病理损伤得到改善,牙龈出血指数、牙齿松动度评分、牙槽骨吸收、TNF-α、IL-6、IL-1β、MDA水平、p-JAK2/JAK2、p-STAT3/STAT3表达显著降低,SOD水平显著增加,具有剂量依赖性(P<0.05);与鸢尾素-H组相比,鸢尾素-H组+激活剂组大鼠病理损伤加重,大鼠牙龈出血指数、牙齿松动度评分、牙槽骨吸收、TNF-α、IL-6、IL-1β、MDA水平、p-JAK2/JAK2、p-STAT3/STAT3表达显著增加,SOD水平显著降低(P<0.05)。结论:鸢尾素抑制牙周炎大鼠氧化应激、炎性反应,减轻大鼠牙周组织损伤,减少牙槽骨吸收,可能与抑制JAK2/STAT3信号通路有关。展开更多
目的:探究南蛇藤素(Celastrol,Cel)调节高迁移率组框1(high mobility group box 1,HMGB1)-晚期糖基化终产物(receptor for advanced glycation end products,RAGE)信号通路对牙周炎大鼠牙周组织损伤的影响及其机制。方法:建立牙周炎大...目的:探究南蛇藤素(Celastrol,Cel)调节高迁移率组框1(high mobility group box 1,HMGB1)-晚期糖基化终产物(receptor for advanced glycation end products,RAGE)信号通路对牙周炎大鼠牙周组织损伤的影响及其机制。方法:建立牙周炎大鼠模型。将大鼠分为对照组(Control组)、模型组(Model组)、南蛇藤素低、中、高剂量组[Cel-L组,1 mg/(kg·d)Cel,Cel-M组,2 mg/(kg·d)Cel和Cel-H组,4 mg/(kg·d)Cel]和Cel-H+HMGB1重组蛋白[4 mg/(kg·d)Cel-H+R-HMGB1]。评定牙周组织炎症情况;微计算机断层扫描观察牙槽骨吸收情况;苏木精-伊红染色和抗酒石酸酸性磷酸酶染色分别观察牙周组织病理变化和破骨细胞数变化;酶联免疫吸附试验检测白细胞介素-6(interleukin-6,IL-6)、肿瘤坏死因子α(tumor necrosis factor-α,TNF-α)和γ-干扰素(interferon-gamma,IFN-γ)超氧化物歧化酶(superoxide dismutase,SOD)、丙二醛(Malondialdehyde,MDA)、过氧化氢酶(catalase,CAT)、活性氧(reactive oxygen species,ROS)、一氧化氮(nitric oxide,NO)和前列腺素E2(prostaglandin E2,PGE2)水平;Westernblot检测HMGB1、RAGE蛋白水平。结果:与Control组相比,Model组大鼠牙龈乳头部分缺失和牙龈上皮侵蚀或溃疡,牙龈上皮和固有层发现大量炎性细胞浸润,牙周胶原束排列不规则,部分胶原纤维溶解变性,牙槽骨吸收明显;大鼠牙龈指数、牙龈出血指数、釉牙骨质界到牙槽嵴顶的距离值、牙周组织破骨细胞数、血清IL-6、TNF-α和IFN-γ水平、牙周组织MDA、ROS、NO和PGE2水平及HMGB1和RAGE蛋白表达显著增加(P<0.05),牙周组织SOD和CAT水平显著降低(P<0.05);与Model组相比,Cel-L组、Cel-M组和Cel-H组大鼠牙槽骨损伤和炎症侵蚀减轻,大鼠牙龈指数、牙龈出血指数、CEJ-ABC值、牙周组织破骨细胞数、血清IL-6、TNF-α和IFN-γ水平、牙周组织MDA、ROS、NO和PGE2水平及HMGB1和RAGE蛋白表达显著降低(P<0.05),牙周组织SOD和CAT水平显著增加(P<0.05),且呈剂量依赖性;HMGB1重组蛋白可逆转南蛇藤素对牙周炎大鼠牙周组织损伤的抑制作用(P<0.05)。结论:南蛇藤素通过抑制HMGB1-RAGE信号通路从而抑制牙周炎大鼠牙周组织损伤。展开更多
The use of elastics to close a diastema or correct tooth malpositions can create unintended consequences if not properly controlled. The American Association of Orthodontists recently issued a consumer alert, warning ...The use of elastics to close a diastema or correct tooth malpositions can create unintended consequences if not properly controlled. The American Association of Orthodontists recently issued a consumer alert, warning of "a substantial risk for irreparable damage" from a new trend called "do-it-yourself" orthodontics, consisting of patients autonomously using elastics to correct tooth position. The elastics can work their way below the gums and around the roots of the teeth, causing damage to the periodontium and even resulting in tooth loss. The cost of implants to replace these teeth would well exceed the cost of proper orthodontic care. This damage could also occur in a dental office, when a general dentist tries to perform a simplified orthodontic correction of a minor tooth malposition. The present case report describes a case of tooth loss caused by a displaced intraoral elastic, which occurred during a simple preprosthetic orthodontic treatment.展开更多
文摘The use of elastics to close a diastema or correct tooth malpositions can create unintended consequences if not properly controlled. The American Association of Orthodontists recently issued a consumer alert, warning of "a substantial risk for irreparable damage" from a new trend called "do-it-yourself" orthodontics, consisting of patients autonomously using elastics to correct tooth position. The elastics can work their way below the gums and around the roots of the teeth, causing damage to the periodontium and even resulting in tooth loss. The cost of implants to replace these teeth would well exceed the cost of proper orthodontic care. This damage could also occur in a dental office, when a general dentist tries to perform a simplified orthodontic correction of a minor tooth malposition. The present case report describes a case of tooth loss caused by a displaced intraoral elastic, which occurred during a simple preprosthetic orthodontic treatment.
