不同能量HMME-PDT对离体牙侧支根管内粪肠球菌的杀灭效果

目的 观察不同激光能量对血卟啉单甲醚介导的光动力疗法(HMME-PDT)杀灭离体牙侧支根管内粪肠球菌的效果.方法 选取人单根管离体前牙80颗,常规根管预备后建立粪肠球菌感染人工模拟侧支根管模型.实验随机分为8组:A组为阴性对照组,以生理盐水冲洗根管；B组为阳性对照组,以5.25％ NaClO冲洗根管；其余6组为HMME-PDT处理组,各组以40μg/ml血卟啉单甲醚(HMME)为光敏剂,避光孵育5 min后用不同激光功率的532 nm半导体激光在根管内上下提拉螺旋照射120 s,按照激光功率的不同,分为C组(50 mW)、D组(60 mW)、E组(70 mW)、F组(80 mW)、G组(90 mW)、H组(100 mW).各组实验牙标本(每个离体牙近中面侧支根管作为实验前标本,远中面侧支根管作为对应的实验后标本)处理前与处理后即刻用20#K锉取侧支根管内碎屑,然后将碎屑转至含5 ml TPY液体培养基的试管中,10倍递增连续稀释后厌氧培养24 h,菌落计数.结果 不同激光功率PDT组和生理盐水冲洗组相比,杀菌率的差异有统计学意义(P＜0.05)；和5.25％ NaClO冲洗组相比,D组、E组、F组、G组、H组杀菌率均明显增高(P＜0.05),而C组与5.25％ NaClO冲洗组杀菌率之间的差异无统计学意义(P＞0.05)；不同激光功率的各PDT组的杀菌率随激光功率的增加而增高,其中F组、G组、H组与C组、D组、E组相比,杀菌率显著提高(P＜0.05),而F组、G组、H组3组间杀菌率的差异无统计学意义(P＞0.05).结论 在本实验条件下,HMME-PDT对人工侧支根管内粪肠球菌的最佳杀菌功率参数为80 mW.     

糖尿病微血管病变患者血清CysC、RBP及尿NAG的变化与糖尿病肾病发展的关系

目的 探讨糖尿病肾微血管病变患者血清胱抑素C(cystatin C,CysC)、视黄醇结合蛋白(retinol binding protein,RBP)及尿N-乙酰-β-D氨基葡萄糖苷酶(N-acetyl beta-D Glucosaminidase,NAG)的水平变化与糖尿病肾病病变程度的关系.方法 本研究选取30例2型糖尿病肾病患者(尿微量白蛋白＜ 14.29mg/L)作为A组、选取30例2型糖尿病肾病患者(尿微量白蛋白≥14.29mg/L)作为B组、30例2型糖尿病肾病引发尿毒症患者作为C组、30例体检正常研究对象作为D组,比较四组患者血清中CysC、RBP、NAG的差异.结果 A、B、C、D四组研究对象的CysC、RBP及尿NAG水平差异均具有统计学意义(P＜0.01);组间比较,A、B、C组CysC、RBP及尿NAG与D组比较均显著的高于D组,差异均具有统计学意义(P＜0.05);A、B组患者的CysC、RBP及尿NAG与C组比较显著低于C组,差异具有统计学意义(P＜0.05);A组患者的CysC、RBP及尿NAG与B组比较显著低于B组,差异具有统计学意义(P＜0.05).结论 糖尿病肾病患者随着病变程度不断加重,CysC、RBP及尿NAG水平呈明显的上升趋势.     

蛋白琥珀酸铁联合rHu-EPO防治早产儿贫血的疗效探究

目的 探讨蛋白琥珀酸铁联合重组人红细胞生成素(rHu-EPO)防治早产儿贫血的效果及安全性.方法 选取2014年3月至2015年3月间在我院出生的120例早产儿,按家长自愿原则随机分成三组,A组给予蛋白琥珀酸铁2mg/kg、po、bid,B组给予rHu-EPO 250IU/kg、iH、qod(3次/周),C组给予蛋白琥珀酸联合rHu-EPO,用法及用量同A、B组.三组患儿均在出生后第4天给予维生素C 0.1 mg/d及维生素E 25mg/d、po、qd.对比三组早产儿治疗前后体重(W)、血红蛋白(Hb)、红细胞比容(Hct)、血清铁蛋白(SF)及网织红细胞(Ret)的变化情况,并分析其输血及不良反应发生情况.结果 治疗前后三组患儿各项指标水平与治疗前比较差异均有统计学意义(P＜0.05);治疗后,C组患儿W及Ret水平均显著高于A组,差异有统计学意义(P＜0.05),但与B组差异无统计学意义(P＞0.05),而其SF水平显著高于B组,差异有统计学意义(P＜0.05),但与A组差异无统计学意义(P＞0.05),同时其Hb及Hct水平均显著高于A、B组,差异有统计学意义(P＜0.05);不良反应发生情况,C组与B组差异无统计学意义(P＞0.05),但显著低于A组,差异有统计学意义(P＜0.05).结论 蛋白琥珀酸铁联合rHu-EPO防治早产儿贫血其疗效显著,安全可靠,值得在临床上推广应用.     

激光针灸对CIA大鼠滑膜组织病理改变的影响研究

目的 研究激光针灸对Ⅱ型胶原蛋白诱导的关节炎(CIA)模型大鼠滑膜组织病理改变的影响.方法 将大鼠随机分为激光针灸50、100、150 mW组,并设正常组、模型组和药物组作对照.激光光斑直径0.3 cm,每次照射10 min,穴位选择足三里和肾俞,干预10d后取材,制作踝关节病理切片,HE染色,光镜下观察滑膜组织炎性细胞浸润、纤维组织增生、滑膜细胞增生及巨噬细胞增生情况.结果 模型组在滑膜细胞增生(P＜0.001)、炎性细胞浸润(P＜0.01)、巨噬细胞增生(P＜0.01)、纤维组织增生(P＜0.001)的分级评分和总积分(P＜0.001)方面均较正常组显著降低,差异具有统计学意义.治疗后,与模型组相比,各治疗组在以上评分方面均显示出不同程度的降低,差异具有统计学意义.其中,激光针灸50 mW组的纤维组织增生评分(P＜0.01),激光针灸100 mW组的滑膜细胞增生评分、纤维组织增生评分和总积分(均P＜0.01),激光针灸150 mW组的滑膜细胞增生评分(P＜0.05)、纤维组织增生评分(P＜0.0l)和总积分(P＜0.05).治疗组评分均显著优于模型组;而且激光针灸100 mW组的滑膜细胞增生评分显著优于药物组,差异具有统计学意义(P＜0.05).结论 激光针灸对CIA大鼠滑膜组织的滑膜细胞增生、纤维组织增生等病理改变有明显抑制作用,其作用效果与激光的参数设置有关.     

大鼠心肌缺血后心肌组织端粒酶的表达变化

目的 探讨盐酸异丙肾上腺素和冠状动脉结扎术致大鼠心肌缺血后心肌组织端粒酶(TMA)的表达.方法 60只SD大鼠随机分为A、B、C 3个实验组,每组均设对照组.实验组经腹腔注射盐酸异丙肾上腺素8 mg/kg后、随机分为A组(缺血30 min组)和B组(缺血60 min组),A、B对照组腹腔注射8 ml/kg注射用水.C组为冠状动脉结扎30 min组,3组均查心电图,左心室取血查心肌酶.组织学和免疫组织化学方法观察心肌组织TMA的表达,计算机图像分析测定TMA含量的变化.结果 A、B、C 3个实验组TMA的表达均较对照组增强.计算机图像分析测定TMA的含量均较各自对照组升高,且具有显著的统计学意义(P＜0.05或P＜0.01).3个实验组之间比较有显著的统计学差异.结论 心肌缺血能刺激心肌组织TMA的表达增强.     

亚甲基蓝介导的光动力疗法联合小檗碱对牙龈卟啉单胞菌抑制作用的体外研究

目的探讨亚甲基蓝介导的光动力疗法(PDT)联合小檗碱对牙龈卟啉单胞菌(P.g)的体外抑制作用。方法培养P.g至对数期中后期,将不同质量浓度亚甲基蓝加入P.g菌悬液中,作用5 min,激光(波长660 nm,功率140 mW/cm^(2))照射2 min,寻找亚甲基蓝结合激光体外抑制P.g的最佳浓度;观察亚甲基蓝介导的PDT体外抑制P.g的效果以及小檗碱对P.g生长曲线的影响;探讨亚甲基蓝介导的PDT与小檗碱先后联合应用对P.g的抑制作用;扫描电子显微镜观察亚甲基蓝介导的PDT及小檗碱对P.g形态的影响;紫外分光光度仪测量各成分吸收峰。结果在660 nm激光激发下,亚甲基蓝质量浓度为24.4141μg/ml时,抑菌效果最好。与对照组比较,亚甲基蓝组和PDT组差异均有统计学意义(均P<0.001)。0.05 mg/ml小檗碱对P.g浮游细菌具有抑制作用。与对照组比较,0.05 mg/ml小檗碱组菌落数降低,其差异有统计学意义(P<0.01);0.05 mg/ml小檗碱+光照组与对照组比较差异无统计学意义(P>0.05)。当PDT与小檗碱联用时对P.g有协同抑制作用,且先PDT后小檗碱组较先小檗碱后PDT组菌落数降低,其差异均有统计学意义(均P<0.01)。P.g经亚甲基蓝介导的PDT处理后,细菌细胞壁皱缩成团,经小檗碱处理后,细菌表面变得光滑且菌体长度较对照组增长。结论亚甲基蓝介导的PDT对P.g有抑制作用,当与小檗碱联用时,对P.g有协同抑制作用,且联合应用中先PDT后小檗碱作用时抑菌效果更好。     

颈部迷走神经干低频刺激对SD大鼠房颤模型的抑制作用

目的研究颈部迷走神经干低频刺激对SD大鼠房颤模型的抑制作用及心房肌凋亡率和同型半胱氨酸(Hcy)、间隙连接蛋白43(Cx43)水平的影响。方法选择80只实验SD大鼠作为研究对象,使用随机数字分为4组:空白对照组(A组)、模型组(B组)、假手术组(C组)、治疗组(D组),每组20只。4组大鼠均治疗2周,分别对组大鼠心房有效不应期(ERP)以及房颤诱发情况、心肌组织Hcy、Cx43水平、心肌凋亡率之间的差异以及大鼠心房肌凋亡比率与心肌组织Hcy、Cx43水平相关性进行分析。结果 4组大鼠的ERP从高到低依次为A、C、B、D组,A、C两组大鼠均未出现房颤,且D组大鼠的房颤频率以及持续时间均显著小于B组大鼠;B、C两组大鼠的Hcy、Cx43水平差异无统计学意义(P0.05),而其他两两比较之间的差异有统计学意义(P0.05);B、C两组大鼠的心房肌心肌凋亡率之间的差异无统计学意义,而其他两两比较之间的差异有统计学意义(P0.05);大鼠的心房肌凋亡比率与心肌组织Hcy、Cx43水平呈现正相关。结论通过对模拟房颤实验大鼠进行颈迷走神经的刺激作用,实验大鼠的Hcy、Cx43水平显著降低,患者的心肌凋亡率显著下降,房颤频率以及持续时间显著缩短。     

α1受体阻滞剂诱导前列腺细胞凋亡的临床意义

目的 探讨α1受体(α1-AR)阻滞剂诱导前列腺细胞凋亡的临床意义.方法 取穿刺或手术切除的良性前列腺组织.根据服用α1-AR阻滞剂(特拉唑嗪或多沙唑嗪)时间长短分组:A组(对照组,未服药物者);B组(服药1～3个月);C组(服药3～6个月);D组(服药6～12个月).原位凋亡法(TUNEL)检测各组前列腺细胞凋亡的情况.分析细胞凋亡情况及其与国际前列腺症状评分(IPSS)、生活质量评分(QOL)、最大尿流率(MUF)改善的关系.结果 B、c、D组前列腺细胞凋亡率(AI)分别为(1.5±0.8)%、(2.3±1.2)%、(2.4±1.1)%,较A组(0.8±0.5)%明显增高(P＜0.01).C组与B组的AI差异有统计学意义(P＜0.05);D组与C组的AI差异无统计学意义.B、C、D组IPSS的改善为(5.0±3.3)、(8.0±3.5)、(9.0±1.8);QOL的改善为(2.0±0.9)、(3.0±1.6)、(3.0±1.9)分;MUF的改善为(3.0±1.2)、(5.0±3.2)、(6.0±1.7)ml/s;均较A组的改善明显增高(P＜0.01).C组IPSS、QOL、MUF的改善均较B组明显增高(P＜0.05);D组IPSS、QOL、MUF的改善与C组比较差异无统计学意义(P＞0.05).前列腺细胞的AI与患者IPSS、QOL、MUF的改善呈正相关(r=0.361,0.289,0.412,P均＜0.01).结论 α1-AR阻滞剂诱导前列腺细胞凋亡与下尿路症状改善相关,可能为药物治疗良性前列腺增生(BPH)机制之一.     

一氧化氮对慢性缺氧高二氧化碳大鼠肺血管尾加压素Ⅱ的影舷

目的探讨一氧化氮/L-精氨酸(NO/L-Arg)系统和尾加压素Ⅱ(U Ⅱ)在大鼠慢性缺氧(O2)高二氧化碳(CO2)肺动脉高压病理过程的作用及关系.方法40只大鼠随机分成4组(每组各10只)正常对照组(A组)、慢性缺O2高CO2加生理盐水4周组(B组)、慢性缺O2高CO2加L-Arg脂质体4周组(C组)、慢性缺O2高CO2加N-硝基-L-精氨酸甲酯(L-NAME)4周组(D组).免疫组化法和组织原位杂交法检测肺小动脉U Ⅱ和U Ⅱ mRNA、U Ⅱ受体(UT) mRNA的表达,并观察肺小动脉显微结构的变化.结果(1)肺动脉平均压(mPAP)、右心室(RV)和左心室+室间隔(LV+S)重量比值[RV/(LV+S)]B组高于A组(均P＜0.05);C组低于B组(均P＜0.01);D组两指标不仅高于A组(P＜0.01和＜0.05),且mPAP也高于B组(P＜0.01).(2)肺小动脉管壁面积/管总面积(WA/TA)和中膜厚度(PAMT)B组显著大于A组(P＜0.05);C组与B组的差异也有显著性(P＜0.01);而D组WA/TA也显著高于A组.(3)肺小动脉U Ⅱ、U Ⅱ mRNA、UT mRNA表达同A组比较,B组、D组各指标都显著增高(均P＜0.01);C组U Ⅱ、U Ⅱ mRNA的表达较B组明显下调(P＜0.01),同A组比较,其U Ⅱ表达下调但UT mRNA表达增加(均P＜0.01);D组U Ⅱ表达较B组低,而UT mRNA表达较B组高(均P＜0.01).结论慢性缺O2高CO2肺动脉高压的发生发展可能与U Ⅱ的异常表达增加有关,而外源性NO可能有抑制U Ⅱ的作用.     

不同剂量布托啡诺在剖宫产术后产妇静脉自控疼痛效应的比较

目的 探讨布托啡诺在剖宫产术后自控疼痛的合理给药方案.方法 选取75例在利多卡因连续硬膜外麻下行剖宫产手术的产妇作为研究对象,其ASA分级为Ⅰ～Ⅱ.所有产妇被随机分成3组(A组、B组、C组),每组25例.术后自控疼痛方案:各组产妇在手术结束前均给予布托啡诺负荷量30μg/kg,随后的布托啡诺维持量,A组为2μg·kg-1·h-1;B组为3μg·kg-1·h-1,C组为4μg·kg-1·h-1.观察并记录术后48 h内不同时点的各项指标,包括疼痛评分、镇静评分、血压、心率、呼吸、呼吸抑制(血氧饱和度≤90%或者呼吸频率≤10次/min)、恶心呕吐次数、疼痛泵按压次数(D,)与实际进药次数(D:)比值.结果 在术后6-24 h各时点,B组与C组之间疼痛效果差异无统计学意义(P＞0.05),但均优于A组(P＜0.05).术后1h及术后24～48 h各时点,各组疼痛评分差异无统计学意义.术后48h内各时点,A组与C组的组间镇静评分均有显著性差异(P＜0.05),C组镇静效果强于A组.但B组与A组、C组之间的镇静评分差异无统计学意义(P＞0.05).术后48 h内,B组和C组D1/D2值与A组比较,差异均有统计学意义(PAB=0.037,PAC=0.028),但B组与C组差异无统计学意义(P=0.086).结论 剖宫产术后使用布托啡诺静脉自控疼痛效果优良,术后24 h内推荐4μg·kg-1·h-1的维持量,24 h后可根据病情酌情减量以达最佳效果.     

BODIPY光敏药物在牙齿美白上的应用研究

目的探讨氟化硼络合二吡咯甲川（BODIPY）光敏药物结合光动力治疗（PDT）在牙齿美白的应用及对牙齿表面釉质的影响。方法人离体牙分别经过氧化氢和BODIPY光敏药物光动力美白处理后,使用vita比色板和扫描电镜观察,分析不同方法对牙齿的美白效果及美白前后牙齿表层釉质在晶体和丑微结构上发生的改变。结果经过美自处理前后进行对比,过氧化氢法美白效果显著,但牙齿表面釉质出现严重脱矿现象;BODIPY光敏药物PDT法的美白效果良好,牙齿光滑,牙齿表面有再矿化现象。结论利用BODIPY光敏药物的PDT法对牙齿具有一定的美白效果,并能促进牙齿表面釉质的再矿化,有望成为牙齿美白的新方法。     

HMME-PDT对大鼠致龋模型中变形链球菌抑制作用的研究

目的 探讨不同参数光动力疗法(PDT)在大鼠口腔龋齿预防中的作用.方法 用变形链球菌感染Wistar大鼠口腔,建立龋齿模型.以0.9%生理盐水、0.2%氟化钠为对照组,单纯激光、单纯光敏剂、不同参数PDT为实验组.采用血卟啉单甲醚(HMME)为光敏剂,532 nm半导体激光为光源,每周处理牙齿1次,5周后处死大鼠,Ke...     

酪蛋白磷酸多肽/无定形磷酸钙复合物与氟化钠预防正畸托槽周围的牙釉质脱矿

BACKGROUND: In clinical practice, both casein phosphopeptides/amorphous calcium phosphate compound and fluoride can effectively prevent the occurrence of enamel demineralization and caries. OBJECTIVE: To investigate the preventive effects of casein phosphopeptides/amorphous calcium phosphate compound and fluoride on enamel demineralization in the orthodontic treatment, so as to seek a remineralization agent with good effect. METHODS: Totally 40 human in vitro teeth which had been well bonded to brackets were randomly divided into four groups: control group (the surface was not coated with any substance), GC tooth mousse group (the surface was coated with casein phosphopeptides/amorphous calcium phosphate compound), duraphat group (the surface was coated with fluoride) and combined group (the surface was coated with casein phosphopeptides /amorphous calcium phosphate compound and fluoride). The enamel surface porosity was observed by scanning electron microscopy after the successive 14-day demineralization-remineralization experiments in these four groups. The change value of microhardness was measured before and after the experiment in each group. RESULTS AND CONCLUSION: There was obvious enamel demineralization in the control group, but not in the other three groups. The change value of microhardness in GC tooth mousse, duraphat and combined groups was lower than that in the control group (P < 0.05), and there was no significant difference between GC tooth mousse, duraphat and combined groups. These results demonstrate that fluoride, casein phosphopeptides/amorphous calcium phosphate compound and their combination can prevent enamel demineralization, promote remineralization; however, their combination does not improve the effect of preventing enamel demineralization.         

Treatment of tooth fracture by medium-energy CO2 laser and DP-bioactive glass paste: the interaction of enamel and DP-bioactive glass paste during irradiation by CO2 laser

Acute trauma or trauma associated with occlusal disturbance can produce tooth crack or fracture. Although several methods are proposed to treat the defect, however, the prognosis is generally poor. If the fusion of a tooth fracture by laser is possible, it will offer an alternative to extraction or at least serve as an adjunctive treatment in the reconstruction. We have tried to use a continuous-wave CO2 laser and a newly developed DP-bioactive glass paste (DPGP) to fuse or bridge tooth crack or fracture lines. Both the DP-bioactive glass paste and tooth enamel have strong absorption bands at the wavelength of 10.6 microm. Therefore, under CO2 laser, DPGP and enamel should have an effective absorption and melt together. The interface between DPGP and enamel could be regarded as a mixture of DPGP and enamel (DPG-E). The study focused on the phase transformation, microstructure, functional group and thermal behavior of DPG-E with or without CO2 laser irradiation, by the analytical techniques of XRD, FTIR, DTA/TGA, and SEM. The results of XRD showed that the main crystal phase in the DPG-E was dicalcium phosphate dihydrate (CaHPO4.2H2O). It changed into CaHPO4, gamma-Ca2P2O7, beta-Ca2P2O7 and finally alpha-Ca2P2O7 with increasing temperature. In the FTIR analysis, the 720 cm(-1) absorption band ascribed to the P-O-P linkage in pyrophosphate rose up and the intensities of the OH- bands reduced after laser irradiation. In regard to the results of DTA/TGA after irradiation, the weight loss decreased due to the removal of part of absorption water and crystallization water by the CO2 laser. SEM micrographs revealed that the melted masses and the plate-like crystals formed a tight chemical bond between the enamel and DPGP. We expect that DPGP with the help of CO2 laser can be an alternative to the treatment of tooth crack or fracture.     

罗丹明123介导的光动力学疗法预防急性移植物抗宿主病的实验研究

目的：探讨Rh123介导的光动力学疗法(PDT)预防异基因造血干细胞移植急性移植物抗宿主病(aGVHD)的可行性及安全性。 方法： 以C57B/6小鼠为供鼠，BALB/c小鼠为受鼠，建立小鼠异基因骨髓移植的aGVHD模型；混合脾脏淋巴细胞培养(MLC)加Rh123孵育，接受氩离子激光30 mW/cm2照射3 min，再与供者骨髓混合移植给受鼠，观察受鼠移植后造血重建、aGVHD发生情况及病理改变、生存率；流式细胞仪检测MLC细胞CD3+CD69+阳性率。 结果： 光动力学治疗组的aGVHD发生减少，肝、皮肤、肠道病理程度减轻，生存率显著高于未经光动力学治疗组；光动力学处理后的混合淋巴细胞培养24 h后，CD34+CD69+表达明显下降。 结论： Rh123介导的光动力学疗法可有效预防小鼠异基因骨髓移植的aGVHD。     

半导体激光与氟化钠治疗牙本质过敏症的对比研究

目的：观察半导体激光与氟化钠对牙本质过敏症的临床疗效，及优缺点进行比较，探讨其作用机理；方法：牙本质过敏患牙408颗随机分成两组，一组用常规氟化钠脱敏，一组用半导体激光治疗。激光组采用MDC－500型半导体激光治疗仪，波长830nm，输出功率0mW-500mW连续可调，光班直径3mm。先用探针确定过敏位置及范围，再用已消毒的激光治疗仪导光棒直接接触照射患牙敏感区，输出功率200－300mW，每次3分钟，3－5次为一疗程。若敏感区较大，可多点照射直至全部覆盖；结果：用半导体激光治疗的患牙，一次照射疼痛缓解率为100％，一疗程后总显效率为89．2％；氟化钠治疗组，即刻疼痛缓解率为75％，两者有显著性差异（P＜0．01）。结论：半导体激光对牙本质过敏症有很好的疗效，优于氟化钠治疗。     

超声辐照携带miR-520c-3p和miR-132微泡对体外培养人肝癌细胞Huh7的影响

目的:观察超声辐照携带miR-520c-3p和miR-132微泡对体外培养人肝癌细胞Huh7的影响.方法:以超声辐照携带miR-520c-3p和miR-132微泡转染体外培养人肝癌Huh7细胞株.实验分5组:对照组(A组),miR-520c-3p mimics negative control+miR-132 mimics negative control+微泡造影剂+超声辐照(B组),miR-520c-3p mimics+微泡造影剂+超声辐照(C组),miR-132 mimic+微泡造影剂+超声辐照(D组),miR-520c-3p mimics+miR-132 mimics+微泡造影剂+超声辐照(E组).超声辐照条件:机械指数0.4,辐照参数2.0 W/cm2,连续辐照30 s,间隔60 s,共5次.采用实时荧光定量PCR检测miR-520c-3p,miR-132,磷脂酰肌醇蛋白多糖-3(GPC3)和转录辅助因子YAP mRNA表达,采用Western印迹检测GPC3和YAP蛋白表达,采用噻唑监比色法检测细胞增殖活性,采用流式细胞术检测细胞凋亡.结果:与A组、B组比较,C组、E组miR-520c-3p相对表达量升高(P＜0.05),而D组无明显改变(p＞0.05);D组、E组miR-132相对表达量升高(p＜0.05),而C组无明显改变(p＞0.05).与A组、B组比较,C组、E组GPC3蛋白相对表达量降低(P＜0.05),而其mRNA相对表达量无明显改变(P＞0.05).C组、D组、E组YAP蛋白以及其mRNA相对表达量均降低(P＜0.05).与A组、B组比较,C组、D组、E组细胞增殖率降低(P＜0.05),且E组降低最明显(p＜0.05);C组、D组、E组细胞凋亡率增加(P＜0.05),且E组凋亡最明显(p＜0.05).结论:超声辐照携带miR-520c-3p和miR-132微泡能显著抑制人肝癌Huh7细胞株增殖,并促进其凋亡,其机制可能与调节GPC3和YAP的表达有关.     

PSD-007对宫颈癌Hela细胞光动力杀伤效应的剂量学研究

目的 探讨癌光啉（PSD-007）对人宫颈癌Hela细胞体外光动力杀伤效应及主要影响因素.方法 不同质量浓度（0、3.125、6.25、12.5、25、50、100 μg/ml）的PSD-007与Hela细胞共同孵育2h后,予以不同能量（0、0.6、1.2、2.4、4.8、9.6 J/cm2）635 nm波长的激光照射,以相同剂量光照和光敏剂剂量的人乳腺癌细胞系MCF-7光动力杀伤作用做对比,通过噻唑蓝（MTT）比色法测定细胞的光密度（OD）值及存活率;质量浓度为12.5 μg/ml的PSD-007与细胞共同孵育2h后,以不同能量（1.2、2.4、4.8 J/cm2）的激光照射,流式细胞术（FCM）分析细胞周期及凋亡率.结果 与空白对照组相比,单纯光敏剂PSD-007在＞25 μg/ml质量浓度下影响Hela细胞存活率,光动力疗法（PDT）对Hela细胞有更明显的杀伤效应,并且随着光敏剂质量浓度增加和光照能量密度增大,对细胞的杀伤效果逐渐增强.当光敏剂质量浓度＞12.5 μg/ml,光照能量＞4.8 J/cm2时,各组间细胞存活率的差异无统计学意义（P＞0.05）.FCM分析发现,PDT于G0/G1期阻断Hela细胞生长,凋亡诱导作用呈时间依赖性.结论 光敏剂PSD-007自身对体外人宫颈癌细胞系Hela细胞具有生长抑制作用,PSD-007介导的光动力杀伤效应更为显著,较人乳腺癌-7（MCF-7）细胞的PSD-007光动力作用有更低的使用剂量和光照剂量.     

In vitro detection and quantification of enamel and root caries using infrared photothermal radiometry and modulated luminescence

Artificially created demineralized and remineralized carious lesions on the root and enamel of human teeth were examined by photothermal radiometry (PTR) and modulated luminescence (LUM). Fourteen extracted human teeth were used and a lesion was created on a 1 mmx4 mm rectangular window, spanning root to enamel, using a lactic acid-based acidified gel to demineralize the tooth surface. The lesion was then exposed to a remineralization solution. Each sample was examined with PTR/LUM on the root and enamel before and after treatment at times from 1 to 10 (5 on root) days of demineralization and 2 to 10 days of remineralization. Ten-day (5 on root) demineralized samples were remineralized. After completing all the experiments, transverse microradiography (TMR) analysis was performed to compare and correlate the PTR/LUM signals to the depth of lesions and mineral losses. The PTR and LUM amplitudes and phases showed gradual and consistent changes with treatment time. In this study, TMR showed good correlation coefficients with PTR and LUM. It was also found that the length of the treatment time did not correlate very well to any technique, PTR/LUM or TMR, which implies a significant degree of inhomogeneity of the demireralization and remineralization rates in each and every tooth.     

Quantitative analysis of the calcium and phosphorus content of developing and permanent human teeth.

It was the aim of this study to investigate the distribution of Ca, P and C in predentin, dentin and enamel in human tooth buds and permanent teeth by EDX element analysis. The mandible of a 16-week-old human fetus containing eight mineralizing tooth buds and three human permanent molars were fixed in formaldehyde and embedded in Technovit 9100. Serial sections of 80 microm thickness of the mandible were cut in the frontal-dorsal direction, and polarized light micrographs were taken of these sections. The permanent teeth were cut in mesio-distal direction. The sections were investigated with scanning electron microscopy and EDX element analysis with a Philips XL 30 FEG scanning microscope and an EDAX energy-dispersive X-ray system using spot measurements, EDX line-scans and element mapping. Quantitative measurements were made in predentin, mineralizing dentin adjacent to predentin, mature dentin, mineralizing enamel and young enamel of developing teeth and mature enamel of permanent teeth. In developing teeth the Ca and P content increased rapidly from outer predentin towards mineralizing dentin. In enamel prisms of developing teeth the Ca and P content increased linearly from the surface towards the enamel-dentin junction. In permanent teeth only a small layer of predentin was found. The Ca and P content in enamel and circumpulpal dentin of permanent teeth was higher than in developing teeth. The Ca/P ratio differed between predentin and dentin areas reflecting different calcium phosphate compositions, but it was the same in mineralizing and young enamel. The differences in the distribution of Ca and P reflect different mineralizing patterns of the enamel and dentin matrices.