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1.
目的:探讨CKIP-1基因对小鼠骨髓间充质干细胞(BMSCs)的增殖和分化能力的调控。方法:选择CKIP-1基因敲除型小鼠(KO)和野生型C57小鼠(WT),采用全骨髓贴壁法培养BMSCs,取第3代BMSCs,分为KO组和WT组,分别采用成骨及成脂诱导液对细胞进行诱导培养,MTT法检测细胞增殖,流式细胞仪检测目的细胞表面标记分子,用ALP染色、茜素红染色、油红O染色分别对细胞成骨及成脂能力做定量分析。结果:2种细胞增殖和干细胞分子表达相似;成骨诱导后ALP染色显示,KO组的细胞染色的阳性率要大于WT组。茜素红染色观察显示KO组的矿化结节要多于WT组;油红O染色显示KO组细胞的脂质沉淀量大于WT组。结论:CKIP-1基因缺失可以使BMSCs成骨及成脂分化能力增强,对其增殖影响不明显。  相似文献   

2.
目的:在成功分离培养正常同龄人牙囊细胞(dental follicle cells,DFCs)与颅骨锁骨发育不全(cleidocranial dysplasia, CCD)患者牙囊细胞(DFCs-CCD)的基础上,研究其一般体外生物学特征,包括增殖、克隆、成骨及破骨能力。方法:采用 BrdU细胞增殖实验与倍增法研究两种来源 DFCs 增殖能力;用结晶紫染液染色培养12 d 的两种 DFCs,分析其克隆形成能力;并用成骨诱导液诱导两种 DFCs 成骨,用 Western blot 和茜素红染色法分析成骨能力,用实时定量 PCR 方法研究其破骨基因表达差异。结果:DFCs-CCD 的 BrdU 阳性率高于 DFCs,同时 DFCs 的群体倍增时间为(1.834±0.093)d,而 DFCs-CCD 的则为(1.394±0.028)d,差异具有统计学意义(P <0.05);DFCs-CCD 的克隆集落多于 DFCs,但 Runt 相关转录因子2(Runt-related transcrip-tion factor 2,Runx2)、成骨细胞特异性转录因子 Osterix、骨钙素(osteocalcin,Ocn)等成骨相关蛋白表达水平低,而其茜素红染色所示钙化结节同样较少;同时,DFCs-CCD 高表达核因子-κB 受体活化因子(receptor activator for nuclear factor-κB,RANK)和骨保护素(osteoprotegerin,OPG)等破骨相关基因(P <0.05),而核因子-κB 受体活化因子配体(receptor activator for nuclear factor-κB ligand,RANKL)水平无统计学差异(P >0.05)。结论:相比 DFCs,DFCs-CCD 具有更强的增殖、克隆能力和更弱的成骨能力,而破骨基因表达紊乱。  相似文献   

3.
目的 研究唑来膦酸对大鼠骨髓间充质干细胞(BMSCs)增殖及成骨分化的作用。方法 取大鼠BMSCs体外原代培养,使用含不同浓度(1、5、10、20 μmol·L -1)唑来膦酸的成骨诱导培养基干预细胞作为实验组,不含唑来膦酸的培养基干预细胞作为对照组。CCK-8检测各组细胞增殖活性;茜素红和碱性磷酸酶染色检测各组细胞成骨分化能力;实时荧光定量聚合酶链反应(qRT-PCR)检测各组细胞碱性磷酸酶(ALP)、骨形态发生蛋白2(BMP-2)、Ⅰ型胶原酶(COL-Ⅰ)、Runt相关转录因子2(Runx-2)、锌指结构转录因子(Osx)、骨钙蛋白(OCN)、骨桥蛋白(OPN)的mRNA表达量。结果 1 μmol·L -1唑来膦酸对BMSCs的增殖、成骨分化无影响,与对照组比较差异无统计学意义(P>0.05)。浓度大于1 μmol·L -1唑来膦酸抑制BMSCs的增殖和成骨分化,且抑制作用呈浓度依赖性,与对照组比较差异有统计学意义(P<0.05)。当唑来膦酸浓度为5 μmol·L -1时,ALP、BMP-2、COL-Ⅰ等成骨相关基因的表达量高于对照组(P<0.05),而当唑来膦酸浓度大于5 μmol·L -1时,成骨相关基因的表达量低于对照组(P<0.05)。结论 低浓度唑来膦酸对BMSCs增殖和成骨分化无影响,5 μmol·L -1唑来膦酸抑制BMSCs增殖但促进其成骨分化,高浓度唑来膦酸抑制BMSCs的增殖和成骨分化。  相似文献   

4.
目的:观察低强度脉冲超声(LIPUS)对大鼠骨髓间充质干细胞(BMSCs)在钛片表面成骨分化的影响.方法:将体外培养的BMSCs分别接种于光滑钛表面和大颗粒喷砂酸蚀(SLA)钛表面,进行矿化诱导并实施超声干预和假刺激.于矿化诱导后3、7d进行碱性磷酸酶(ALP)定量检测,14 d进行ALP染色观察;矿化诱导21 d后行茜素红染色;于矿化诱导14、21 d检测成骨相关基因及蛋白表达.结果:矿化诱导后3、7d超声组ALP活性较对照组高(P<0.05),14 d超声组与对照组相比钛片表面ALP染色明显深染;茜素红染色显示,21 d后超声组的染色更明显且形成更多的矿化结节;超声组的成骨相关蛋白成骨转录因子2、骨形成蛋白、骨桥蛋白表达增高;RT-PCR检测到成骨相关基因、ALP、成骨转录因子2、骨形成蛋白、骨桥蛋白、骨钙素、Ⅰ型胶原蛋白均有不同程度表达增高(P<0.05).结论:LIPUS可以促进光滑及SLA钛表面BMSCs的成骨分化.  相似文献   

5.
目的 研究唑来膦酸对大鼠骨髓间充质干细胞(BMSCs)增殖及成骨分化的作用。方法 取大鼠BMSCs体外原代培养,使用含不同浓度(1、5、10、20 μmol·L -1)唑来膦酸的成骨诱导培养基干预细胞作为实验组,不含唑来膦酸的培养基干预细胞作为对照组。CCK-8检测各组细胞增殖活性;茜素红和碱性磷酸酶染色检测各组细胞成骨分化能力;实时荧光定量聚合酶链反应(qRT-PCR)检测各组细胞碱性磷酸酶(ALP)、骨形态发生蛋白2(BMP-2)、Ⅰ型胶原酶(COL-Ⅰ)、Runt相关转录因子2(Runx-2)、锌指结构转录因子(Osx)、骨钙蛋白(OCN)、骨桥蛋白(OPN)的mRNA表达量。结果 1 μmol·L -1唑来膦酸对BMSCs的增殖、成骨分化无影响,与对照组比较差异无统计学意义(P>0.05)。浓度大于1 μmol·L -1唑来膦酸抑制BMSCs的增殖和成骨分化,且抑制作用呈浓度依赖性,与对照组比较差异有统计学意义(P<0.05)。当唑来膦酸浓度为5 μmol·L -1时,ALP、BMP-2、COL-Ⅰ等成骨相关基因的表达量高于对照组(P<0.05),而当唑来膦酸浓度大于5 μmol·L -1时,成骨相关基因的表达量低于对照组(P<0.05)。结论 低浓度唑来膦酸对BMSCs增殖和成骨分化无影响,5 μmol·L -1唑来膦酸抑制BMSCs增殖但促进其成骨分化,高浓度唑来膦酸抑制BMSCs的增殖和成骨分化。  相似文献   

6.
目的 采用体外研究的方法评价处理的牙本质基质(TDM)对骨髓间充质干细胞(BMSCs)增殖及成骨分化的影响。方法 将获取的牙本质颗粒进行梯度脱矿处理,制备TDM浸提液。分离培养人BMSCs后,将BMSCs培养于TDM浸提液中,CCK-8法检测细胞的增殖情况,培养7 d后提取细胞总蛋白采用Western blot检测成骨相关蛋白:Ⅰ型胶原蛋白(ColⅠ)、Runt相关转录因子-2(Runx2)的表达情况。结果 TDM浸提液培养后,与空白对照组及羟磷灰石/β-磷酸三钙组相比,细胞增殖明显;培养7 d后,TDM组的ColⅠ、Runx2蛋白的表达量明显增高。结论 TDM可以促进BMSCs的增殖及成骨向分化,提示其应用于骨组织工程的可行性。  相似文献   

7.
目的    因各种原因导致的牙槽骨甚至颌骨的缺损、缺失在临床上十分常见,对患者口腔功能和美观均可造成严重影响。磷酸钙骨水泥(CPC)是公认的具有良好生物相容性的可降解骨移植材料,与Ⅰ型胶原混合后可塑性增强,孔隙率增加且弹性模量更接近于人体骨。本研究通过人工合成神经递质P物质(SP)结合于CPC胶原支架材料,体外培养SD大鼠骨髓间充质干细胞(BMSCs),观察材料表面形貌及对BMSCs生物学行为的影响。方法     2015年9月至2016年1月在第四军医大学口腔医院选取4周龄雌性大鼠20只,进行BMSCs体外培养。研究材料分为3组,A组:纯CPC组;B组:CPC+Ⅰ型胶原组;C组:CPC+Ⅰ型胶原+SP组。扫描电镜(SEM)观察样本表面形貌及BMSCs形态、黏附与增殖。通过测定细胞增殖对数、成骨及成脂诱导对BMSCs进行鉴定,荧光染色定量分析BMSCs的黏附与增殖,成骨诱导液培养14 d后经茜素红染色,并通过碱性磷酸酶(ALP)试剂盒检测细胞ALP活性。结果    原代BMSCs生长旺盛,生长曲线呈典型“S”形。成骨和成脂诱导液培养3周,行茜素红和油红O染色,镜下可见钙化结节及脂滴形成,BMSCs多向分化能力良好。SEM下B、C 组可见胶原与CPC联结紧密,胶原表面呈条索样间隙,表面BMSCs细胞与胶原附着数量多,突触长并彼此相联,细胞伸展良好。荧光显微镜下观察,C组表面活性细胞比例高于A、B 组。成骨诱导14 d后茜素红染色,肉眼观C组颜色较深,ALP检测C组BMSCs的ALP表达高于A、B 2组(P<0.05)。结论    本研究构建的SP加载的CPC胶原复合材料支架对SD大鼠BMSCs的黏附、增殖和成骨分化均具有促进作用,为今后临床牙槽外科修复重建工作提供了新的思路方法和研究基础。  相似文献   

8.
目的探讨黄芪多糖(APS)对诱导培养的犬骨髓基质干细胞(BMSCs)增殖、分化成骨作用及超微结构的影响。方法用瑞氏- 姬姆萨染色、改良Gomori钙- 钴法、茜素红染色法检测BMSCs分化成骨的能力。用四唑盐(MTT)比色和酶动力学方法测定不同浓度和时间的APS对诱导培养的BMSCs增殖影响以及超微结构的改变。结果诱导条件下BMSCs具有成骨细胞活性,瑞氏- 姬姆萨染色呈深蓝色,改良Gomori钙- 钴法将细胞及矿化结节染成黑色,茜素红染色法见细胞及矿化结节成红色。第1、3天时,低浓度(0.005 mg/mL)APS可促进诱导培养的BMSCs增殖;而第5天时,高浓度(50 mg/mL)APS则明显抑制诱导培养的BMSCs增殖。第5天,透射电镜下,0.005 mg/mL APS组细胞线粒体、粗面内质网增多,细胞外基质分泌增加;50 mg/mL APS组细胞发生退变,粗面内质网和线粒体明显减少,且二者明显肿胀、变性、膜结构破坏。结论短期低浓度APS能促进诱导培养的BMSCs的代谢和蛋白质的合成,有利于细胞的增殖和向成骨分化。  相似文献   

9.
目的 研究年龄因素对人牙周膜干细胞(periodontal ligament stem cells,PDLSC)生物学行为的影响。方法  选取2017年10月至2018年10月于青岛市口腔医院口腔外科就诊的因阻生齿或正畸需要拔除牙齿的患者18例,根据不同年龄段分为3组,分别为A组(18 ~ 20 岁)、B组(30 ~ 35岁)、C组(50 ~ 55岁),每组6例。原代培养人PDLSC,采用衰老相关β-半乳糖苷酶染色、MTT法检测各组细胞衰老程度和增殖能力。成骨诱导人PDLSC,采用碱性磷酸酶(ALP)染色和茜素红染色检测各组细胞的成骨分化能力。采用实时荧光定量PCR(qRT-PCR)检测各组多能性相关转录因子Nanog和Sox2的表达水平。结果 各组均成功原代培养出人PDLSC,经衰老相关β-半乳糖苷酶染色发现,A组阳性染色细胞率最低、B组次之、C组最高,组间差异均有统计学意义(均P < 0.05)。通过MTT法检测发现,不同年龄组OD值比较,差异有统计学意义(F = 22.354,P = 0.009),且各组OD值均随着培养时间的延长而增大(F = 28.367,P = 0.018),年龄与时间之间有明显的交互作用(F = 26.431,P = 0.015)。ALP染色和茜素红染色均发现,A组染色面积百分比大于B组和C组,B组染色面积百分比大于C组,差异均有统计学意义(均P < 0.05)。qRT-PCR结果显示,A组Nanog和Sox2的相对表达量均高于B组和C组,B组Nanog和Sox2的相对表达量高于C组,差异均有统计学意义(均P < 0.05)。结论 随着年龄增加,衰老的人PDLSC增多,其增殖能力、成骨分化能力以及多能性相关转录因子的表达水平也显著下降。  相似文献   

10.
目的:??研究高葡萄糖浓度刺激下牙周膜成纤维细胞(PDLC)的增殖能力和成骨分化能力。方法???体外组织块法培养非糖尿病患者PDLC,分别用0?mg·L-1(C组)、1?100?mg·L-1(L组)、4?500?mg·L-1(H组)浓度葡萄糖刺激PDLC,噻唑蓝(MTT)法检测PDLC增殖能力,矿化诱导后茜素红染色观察矿化结节的形成情况,碱性磷酸酶(ALP)活性检测和实时定量聚合酶链反应(RT-PCR)检测成骨相关基因表达。结果???MTT检测结果显示,H组OD值较L组和C组低(P<0.05);成骨诱导21?d后,H组矿化结节面积较L组和C组少(P<0.05);成骨诱导期间, H组ALP活性较L组和C组明显偏低(P<0.05);H组早期成骨基因Runt相关转录因子2、ALP和Ⅰ型胶原诱导前后相对倍增数较L组和C组低(P<0.05)。结论???高浓度葡萄糖能够抑制PDLC增殖能力和成骨分化能力。  相似文献   

11.
目的:研究、比较不同剂型玻璃离子水门汀的溶解性和表面微观形态改变,为临床使用提供依据.方法:将3M树脂加强型玻璃离子水门汀(水粉剂型)、GC玻璃离子水门汀(水粉剂型)及GC玻璃离子水门汀(双糊剂型)分别在人工唾液中浸泡30 d,冷热循环15000次,烘干测重,比较前后质量变化,计算溶解率,并用扫描电镜观察表面微观改变.结果:不同剂型的玻璃离子水门汀溶解率由高到低分别为3M树脂加强型玻璃离子水门汀(水粉剂型)、GC玻璃离子水门汀(水粉剂型)、GC玻璃离子水门汀(双糊剂型).3种玻璃离子水门汀经浸泡溶解后,SEM扫描表面微观形态可观察到GE玻璃离子水门汀(双糊剂型)表面形态改变较少,其他2组玻璃离子水门汀表面微观改变较多.结论:双糊剂型玻璃离子水门汀理化性能及溶解率均低于传统水粉剂型,是未来临床修复治疗的的良好选择.  相似文献   

12.
A model describing the relationship between self-reported quality of restorative dentistry and dentist characteristics for 119 Montana general dentists is presented. The best predictors formed a significant model explaining 22% of the variance of the quality measure. Results are contrasted with a previous estimation of the model for 102 Washington general practitioners. Evidence for the external validity of the model is presented.  相似文献   

13.
The present paper on the design of clinical trials of periodontal therapy first addresses the issue of the etiology of periodontal disease. It is suggested that most if not all forms of destructive periodontal disease are caused by microorganisms and that there are different forms of disease with different microbial etiologies. The progressive nature of destructive periodontal disease is subsequently discussed and it is emphasized that, in a given patient, periodontal sites which show signs of inflammation and attachment loss may not over a period of several months and years show further sign of attachment loss. The present methods of assessing periodontal disease do not allow us to discriminate between potentially active and inactive sites in untreated patients. The significance and variability of indicators of periodontal disease such as bleeding on probing, probing pocket depth and probing attachment level measurements are discussed. The errors inherent in the various measurements are analyzed and suggestions are presented describing how alterations in any of the above parameters could be identified and presented in a clinical trial. Of concern for the statistical analysis of clinical data of periodontal disease is the definition of the "experimental unit". For a number of years, the "experimental unit" in periodontal trials was the patient. It is clear, however, that different sites within the same individual show different patterns of disease progression and lesion morphology and often respond differently to periodontal therapy. Statistical analyses must consequently be designed which recognize differences in site-to-site infection and lesion morphology within a common host. Until such analyses are available, the investigator should be wary of pooling data within the same individual, since such pooling may obscure meaningful alternatives which may take place in individual periodontal sites. Some goals of periodontal therapy are subsequently identified. 4 goals are discussed more in detail, namely: to establish conditions which will allow the patient to maintain a dentition without further breakdown of the periodontium; to reduce pocket depth to establish an anatomy in the dentogingival region which with proper maintainance care will prevent the re-establishment of the subgingival infection; to gain attachment as a result of treatment; to assess the effect of a certain chemotherapeutic agent on periodontal disease.  相似文献   

14.
The reduction of hydrazones is generally suggested to proceed through a reductive cleavage of the nitrogen–nitrogen bond followed by a reduction of the carbon–nitrogen bond. This sequence of reduction processes is here supported for fluorenone (V) and benzophenone (VI) hydrazones as well as by a comparison of the reduction of fluorenone and benzophenone hydrazonium ions (I,III) with corresponding imines (II,IV). Another proof of the presence of imines as intermediates is the splitting of four-electron waves of hydrazones V and VI and hydrazonium ions I and VIII into two waves at pH < 2. This has been interpreted as due to differences in slopes dE1/2/dpH and pKa-values of protonated hydrazine derivatives on one side and corresponding imines on the other. In this pH-range imines formed in reductions of VI and VIII are reduced in a single two-electron wave, those of I and V in two one-electron steps. Fluorenone imine (II) is sufficiently stable to allow recording of time-independent current–voltage curves between pH 6 and 11. In this pH-range the imine (II) is reduced in two one-electron steps. Benzophenone imine (IV) has been found stable between pH 4.6 and 12. At pH 4.6–8 the reduction of the imine IV takes place in a single two-electron step, at pH 8–12 in two one-electron steps. Final proof of the initial cleavage of the N–N bond is presented by comparison with the reduction of nitrones.  相似文献   

15.
16.
ObjectiveLeukoplakia is the most common potentially malignant disorder preceding oral cancer. Chemiluminescence has been developed as an adjunct to conventional examination for the diagnosis of these potentially malignant disorders. This study was conducted to assess the efficacy of chemiluminescence in the diagnosis of leukoplakia and to compare the results with histopathological examination.Study designA total of 50 patients with leukoplakia were included from the outpatients attending the Department of Oral Medicine and Radiology, Dental Hospital, Bengaluru, Karnataka, India. These patients were subjected to conventional oral examination followed by chemiluminescent examination with Vizilite (Zila, Fort Collins, CO, USA) and biopsy for histopathological confirmation.ResultsThe sensitivity, specificity, positive predictive value, and negative predictive value of chemiluminescence were 93.75%, 55.56%, 78.95%, and 83.3%, respectively. The overall accuracy of chemiluminescence was 80%. A statistically significant association was observed between histopathology results and chemiluminescence results.ConclusionAlthough it is an easy, safe, minimal time consuming, and noninvasive technique, it has only adjunctive utility and it does not replace biopsy for the diagnosis of leukoplakia.  相似文献   

17.
目的测量正常青年Monson球面半径。方法选择60名(男30名,女30名)正常青年制取全口印模,应用立体摄影成像的原理与方法对Monson球面半径进行测量和统计学处理。结果Monson球面的半径平均为10.173 cm,大于理论值10.160 cm,差异有显著性(P<0.01);男、女性球面半径差异无显著性。结论本实验所得到的数据可作为全口义齿修复中记录颌位关系的一个参量。  相似文献   

18.
We report an electrochemical method to form a bilayer of dithiol. The cyclic voltammogram of the oxidative deposition of an aromatic dithiol on gold from an alkaline aqueous solution reveals two current peaks separated by more than 400 mV. The integrated charge of the oxidative current peak (B) at the most positive potential is twice that of the other oxidative current peak (A). These two oxidative current peaks were characterized by differential capacitance and electrochemical quartz crystal microbalance (EQCM) measurements. A decrease of the capacity by a factor of two, and an increase of the EQCM frequency change by a factor of two were observed when the potential was scanned from a value where only the first oxidative peak (A) is obtained, to a potential where both oxidative current peaks (A and B) are obtained. Infrared spectra show that the aromatic dithiols adsorb vertically at potentials corresponding to the current peak A and they become tilted for potentials corresponding to the current peak B. The simple relationships between the properties of the two oxidative current peaks are found to be compatible with a step-wise oxidative deposition of a bilayer of dithiol.  相似文献   

19.
目的研究正畸患者曲面体层片上的切牙影像失真发生情况,并分析其原因。 方法从中山大学附属口腔医院放射科影像数据库中选取500例正畸患者的曲面体层片和头影测量侧位片,所有曲面体层片均采用咬合杆投照,分别从切牙牙体影像放大、缩小、牙根变短、根尖模糊等评价指标分析上下颌切牙影像失真的发生情况,在头影测量侧位片上测量中切牙根尖-对颌切牙切缘的距离,探讨切牙影像失真发生的原因。采用SPSS 19.0统计软件对所得数据进行统计学检验。 结果500例患者中,切牙牙体影像正常者共417例,切牙牙体影像失真者共83例,影像失真发生率16.6%,其中切牙牙体影像放大17例、牙体影像缩小0例、牙根变短30例,牙根影像变短伴模糊36例。影像失真患者的根尖-切缘距离大于影像正常的患者,差异有统计学意义(F = 5 187.18,P = 0);影像失真患者的覆盖值大于影像正常的患者,差异有统计学意义(F>477,P = 0)。 结论严重牙颌面畸形如反 、深覆盖是导致曲面体层片的切牙影像失真的主要原因之一。  相似文献   

20.
颌骨动静脉畸形的栓塞治疗   总被引:9,自引:0,他引:9  
目的:总结直接穿刺结合经血管内介入栓塞治疗颌骨动静脉静脉畸形的经验。方法:收治凳骨动静脉畸形患者6例,均进行了介入栓塞治疗。采用的栓塞材料为附凝血棉纤毛的螺圈,聚乙烯醇泡沫微粒和二氰基丙烯酸对丁酯。数字减影颈动脉造影在PHILIPSV300下完成。结果6例颌骨动静脉畸形患者中4,例急性出血得到了快速、有效控制,1例慢性渗血的右下 骨动静脉畸形患者,介入栓塞治疗,拔除松动的右下凳第一磨牙,有效地控制了出血,另1例伴局部软组织搏动性膨隆的上凳骨动静脉畸形患者,介入治疗后膨隆的搏动性得到明显改善,栓塞治疗后分别随访3-24个月,均未发现有口腔内渗血或出血。随访的X线片上,病灶区可见新骨形成。结论:局部穿刺结合经血管内介入栓塞治疗颌骨动静畸形是一种安全、有效的治疗方法。  相似文献   

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