牙周病摄片数字化分析用于临床诊断的探讨

本文探讨了牙周病摄片数字化分析,即纹理分析技术,应用于牙周病诊断的可能性。数字化分析能提供牙槽骨图象的细部特征特征描述和定量表达的形式,将为牙周病提供一种新的诊断方法。     

TGF-beta1 基因rs200482214 位点多态性与黑龙江省汉族人群慢性牙周炎的相关性研究

目的:探讨转移生长因子β1(transforminggrowth factor beta-l,TGF-β1)位点rs200482214基因多态性与黑龙江省汉族人群慢性牙周炎的易感性的相关性。方法:选取2012年3月至2013年7月在哈尔滨医科大学附属口腔医院牙周科就诊的135例轻、中、重度慢性牙周炎汉族患者(牙周炎组)和108例汉族健康对照者(健康对照组)作为研究对象,基因组DNA来自口腔颊粘膜拭子,采用多重单碱基延伸SNP分型技术(Multiplex SNaPshot technique)对所有受试者TGF-β1基因rs200482214位点进行检测,比较两组间此位点基因型分布和等位基因频率的差异。结果:(1)TGF-β1基因rs200482214位点各基因型(GG、GA、AA)分布均符合Hardy-Weinberg遗传平衡定律(P>0.05);(2)TGF-β1基因rs200482214位点GG、GA、AA在牙周炎组和健康对照组的分布频率分别为61.5%、30.4%、8.1%和63.0%、28.7%、8.3%,两组人群基因型分布频率差异无统计学意义(P>0.05);等位基因G、A在牙周炎组和健康对照组分布频率分别为76.7%、23.3%和77.3%、22.7%,两组人群的等位基因分布频率差异亦无统计学意义(P>0.05)。结论:TGF-β1位点rs200482214基因多态性与黑龙江省汉族人群慢性牙周炎的易感性不具有相关性。     

人类巨细胞病毒、EB病毒和单纯疱疹病毒1型与慢性牙周炎的相关性研究

目的　研究人类巨细胞病毒( HCMV)、Epstein- Barr病毒( EBV)和单纯疱疹病毒1型( HSV- 1)与慢性牙周炎的相关性。方法　收集6 2例慢性牙周炎患者(男性2 7例,女性35例;平均年龄5 3岁)的牙周炎部位,轻度龈炎部位的龈下菌斑,提取DNA后使用巢式PCR检测HCMV、EBV和HSV- 1,比较分析它们在同一患者不同部位的检出率。结果　牙周炎部位的HCMV检出率为38.7% ,EBV的检出率为5 8.0 % ,HSV- 1的检出率为30 .6 % ,2种以上病毒合并感染的检出率为4 0 .3% ;轻度龈炎部位的HCMV检出率为12 .9% ,EBV为19.4 % ,HSV- 1为9.7% ,2种以上病毒合并感染的检出率为8.0 %。这3种病毒及其合并感染在牙周炎部位的检出率均高于轻度龈炎部位,差异有统计学意义( P<0 .0 5 )。结论　提示HCMV、EBV、HSV- 1与慢性牙周炎有相关性。     

牙龈卟啉单胞菌感染对慢性牙周炎患者牙周指标、NLRP-3炎性小体通路和Th17/Treg细胞平衡的影响

摘要 目的：探讨牙龈卟啉单胞菌（PG）感染对慢性牙周炎（CP）患者牙周指标、Nod样受体蛋白-3（NLRP-3）炎性小体通路和辅助性T细胞17（Th17）/调节性T细胞（Treg）平衡的影响。方法：选择2018年6月至2021年11月在本院进行拔牙治疗的慢性牙周炎患者106例为CP组,根据是否感染PG分为感染组和未感染组;另选择因阻生齿、错位牙在本院进行治疗的牙周健康患者63例为对照组。记录所有对象的探诊深度（PD）、菌斑指数（PLI）、出血指数（BI）、附着丧失（AL）,采用聚合酶链式反应（PCR）技术检测PG感染率,采用RT-PCR技术检测牙周膜组织中NLRP-3 mRNA,接头蛋白凋亡相关斑点样蛋白（ASC） mRNA、半胱氨酸天冬氨酸酶-1（Caspase-1） mRNA的表达量,采用FACSCalibur流式细胞仪检测外周血Th17、Terg 水平并计算Th17/Treg,比较两组各检测指标水平。结果：对照组PG感染阳性率为17.46%,低于CP组的79.25%,两组比较差异有统计学意义（P＜0.05）。感染组PD、PLI、BI、AL水平均高于非感染组,差异有统计学意义（P＜0.05）。感染组NLRP-3 mRNA、ASC mRNA、Caspase-1 mRNA表达量均高于非感染组,差异有统计学意义（P＜0.05）。感染组外周血Th17细胞、Th17/Treg水平高于非感染组,Treg水平低于非感染组,差异有统计学意义（P＜0.05）。结论：CP患者多数存在PG感染,PG感染对患者的牙周健康、炎症及免疫有明显的影响。     

BTK在粪肠球菌介导的炎症环境中的 破骨作用

目的在粪肠球菌脂磷壁酸(LTA)作用的炎症环境下,研究布鲁顿酪氨酸激酶(BTK)在破骨细胞中的作用,从而为根尖周炎的治疗提供实验依据。方法 PCR检测粪肠球菌LTA刺激破骨细胞后BTK基因水平的表达情况。以浓度300ng/mL的人重组蛋白BTK(recombinant human BTK,rhBTK)刺激破骨细胞,用CCK8法检测破骨细胞增殖和RT-PCR检测破骨细胞分化标志因子TRAP基因水平表达情况。结果破骨前体细胞5d诱导成功。PCR结果发现粪肠球菌LTA刺激后BTK和TRAP的mRNA表达量明显增高;免疫荧光可见LTA刺激后BTK在破骨细胞中的定位情况;300ng/mL rhBTK组可以促进破骨细胞增殖;PCR结果显示,加入rhBTK后,破骨细胞分化标志因子TRAP的mRNA水平升高。结论在粪肠球菌LTA作用的炎症环境下,BTK表达升高;增高BTK后,可以促进破骨细胞的增殖及分化。研究发现BTK参与了破骨细胞的炎症反应进程。     

Heat Shock Proteins in the Human Periodontal Disease Process

The production of HSP by periodontopathic Gram-negative bacteria was examined by SDS-PAGE, two dimensional gel electrophoresis, and Western blotting using monoclonal antibodies against HSPs. Strains of Actinobacillus actinomycetemcomitans, Eikenella corrodens, Fusobacterium nucleatum, Prevotella intermedia, Prevotella nigrescens, Prevotella melaninogenica, and Treponema socranskii species produced HSP which reacted with anti-Yersinia enterocolitica HSP 60 and/or mycobacterial 65-kDa HSP monoclonal antibodies. It was found that gingival homogenate samples from patients with adult periodontitis reacted with anti-human HSP 60 and bovine brain HSP 70 monoclonal antibodies. Antibodies which reacted with bacterial HSP were also found in a serum sample from a periodontitis patient. The present study suggests that HSPs are implicated in the human periodontal disease process.     

Secretory leukocyte protease inhibitor reduces inflammation and alveolar bone resorption in LPS-induced periodontitis in rats and in MC3T3-E1 preosteoblasts

In periodontitis, alveolar bone resorption is induced by excessive host immune and inflammatory response against bacterial infection. Secretory leukocyte protease inhibitor (SLPI) has anti-bacterial and anti-inflammatory activity in inflammatory responses. SLPI inhibits joint inflammation and bone destruction, but the function of SLPI in periodontitis is unclear. Therefore, this study investigated whether SLPI inhibits the inflammatory response and alveolar bone resorption in LPS-induced periodontitis of rats. Micro-computed tomography and histological analysis showed that SLPI inhibited alveolar bone resorption by LPS-induced periodontitis. Immunohistochemistry revealed that SLPI decreased tumor necrosis factor-α (TNF-α) and interleukine-1β (IL-1β) expression in periodontitis tissue, and decreased mRNA and protein expression of TNF-α and IL-1β in LPS-stimulated MC3T3-E1 cells. The results indicated that SLPI reduced alveolar bone resorption in LPS-induced periodontitis and inhibited inflammatory cytokine, such as TNF-α and IL-1β, expression in LPS-stimulated MC3T3-E1 preosteoblasts. Therefore, SLPI could be a regulatory molecule by inhibiting alveolar bone resorption through the reduction of inflammatory cytokines, and inducing osteoblast activation for bone formation.