生物活性玻璃45S5体外对根尖牙乳头细胞成牙本质方向分化的影响

目的 明确生物活性玻璃(45S5)对人根尖牙乳头细胞体外成牙本质方向分化的作用。方法 浓度为0.1 mg/mL的45S5浸提培养液与人根尖牙乳头细胞共培养,离子体发射光谱检测45S5浸提培养液硅、钙、磷离子浓度,细胞活性噻唑蓝比色法检测细胞增殖,Realtime-PCR检测细胞成牙本质方向分化相关基因牙本质涎磷蛋白(DSPP)、牙本质基质蛋白(DMP-1)的表达,茜素红矿化结节染色及氯化十六烷基吡啶钙结节半定量分析矿化结节形成。结果 与对照组相比,45S5浸提培养液中硅离子浓度显著升高(P<0.05);45S5浸提培养液连续诱导培养根尖牙乳头细胞3、5、7 d后,与对照组相比显著促进细胞增殖(P<0.05);45S5浸提培养液连续诱导培养根尖牙乳头细胞7 d,细胞DSPP、DMP-1的表达量显著高于对照组(P<0.05);45S5生物活性玻璃体浸提培养液连续诱导培养根尖牙乳头细胞14和21 d,茜素红染色后观察45S5组和矿化诱导培养液(OM)组均见明显红染矿化结节,对照组未见明显红染矿化结节;氯化十六烷基吡啶钙结节半定量分析各组钙离子浓,45S5和OM组OD值高于对照组(P<0.05),45S5组OD值高于OM组(P<0.05)。结论 0.1 mg/mL生物活性玻璃45S5体外促进根尖牙乳头细胞增殖、成牙本质方向分化相关基因高表达和矿化结节形成,45S5体外促进根尖牙乳头细胞成牙本质方向分化。     

过表达牙本质涎磷蛋白的骨髓间充质干细胞部分牙向和骨向分化基因的表达

目的观察小鼠骨髓间充质干细胞(BM-MSC)过表达牙本质涎磷蛋白(DSPP)后的形态学改变,并研究其部分牙向及骨向分化基因的表达情况。方法体外培养小鼠BM-MSC,通过腺病毒介导的方式将DSPP基因转染小鼠BM-MSC,通过标记基因GFP检测转染效率,观察转染后细胞的形态学改变,RT-PCR方法检测过表达DSPP的BM-MSC有无成牙和成骨基因的mRNA表达。结果成功获得小鼠BM-MSC,经腺病毒介导的DSPP基因转染BM-MSC的转染效率可达42.7%,转染后的细胞出现分化,似成牙本质样细胞。转染后细胞表达DSPP、DMP1、Msx1/2、Pax9、Lhx6/7、Sox9、Cbfα1、Osx、Col等多种牙向和骨向发育分化基因。结论过表达DSPP的BM-MSC出现细胞分化,并可表达多种牙向及骨向发育分化的基因。     

过表达牙本质涎磷蛋白的骨髓间充质干细胞部分牙向和骨向分化基因的表达

目的观察小鼠骨髓间充质干细胞（BM-MSC）过表达牙本质涎磷蛋白（DSPP）后的形态学改变，并研究其部分牙向及骨向分化基因的表达情况。方法体外培养小鼠BM-MSC，通过腺病毒介导的方式将DSPP基因转染小鼠BM-MSC，通过标记基因GFP检测转染效率，观察转染后细胞的形态学改变，RT-PCR方法检测过表达DSPP的BM-MSC有无成牙和成骨基因的mRNA表达。结果成功获得小鼠BM-MSC，经腺病毒介导的DSPP基因转染BM-MSC的转染效率可达42．7％，转染后的细胞出现分化，似成牙本质样细胞。转染后细胞表达DSPP、DMP1、Msx1／2、Pax9、Lhx6／7、Sox9、Cbfα1、Osx、Col Ⅰ等多种牙向和骨向发育分化基因。结论过表达DSPP的BM-MSC出现细胞分化，并可表达多种牙向及骨向发育分化的基因。     

小鼠牙乳头间充质细胞自发牙向分化及相关基因表达分析

目的观察小鼠牙乳头间充质细胞在血清培养基中的自发牙向分化,并对其特异性牙向和骨向分化的相关转录因子的基因表达进行分析。方法获取孕16.5 d(E16.5 d)胎鼠的原代牙乳头间充质细胞,分别在含血清培养基和添加白血病抑制因子(LIF)的血清培养基中传代培养,观察细胞是否出现成牙本质细胞表型分化,并检测牙向分化表型和维持未分化表型的细胞的特异性转录因子的mRNA表达情况。结果单纯血清培养基培养的牙乳头间充质细胞可在第4代后自发分化为成牙本质细胞表型;而添加106U/L LIF的含血清培养基,可使小鼠牙乳头间充质细胞的未分化表型稳定至第9代。无论细胞是否出现牙向分化,表现成牙间充质细胞特性的Msx1/Msx2、Pax9、Lhx6/Lhx7均有表达;而成牙本质细胞表型分化后尚能检测到DSPP、Sox9、Cbfα1、Osx等启动向矿化组织细胞终末分化的特异性基因表达。结论牙乳头间充质细胞的自发牙向分化模型可作为诱导其他成体间充质干细胞牙向分化时的阳性对照,其基因表达模式可为研究其他成体干细胞牙向分化后在基因水平上的变化提供佐证。     

小鼠牙乳头间充质细胞自发牙向分化及相关基因表达分析

目的观察小鼠牙乳头间充质细胞在血清培养基中的自发牙向分化，并对其特异性牙向和骨向分化的相关转录因子的基因表达进行分析。方法获取孕16．5d（E16．5d）胎鼠的原代牙乳头间充质细胞，分别在含血清培养基和添加自血病抑制因子（LIF）的血清培养基中传代培养，观察细胞是否出现成牙本质细胞表型分化，并检测牙向分化表型和维持未分化表型的细胞的特异性转录因子的mRNA表达情况。结果单纯血清培养基培养的牙乳头间充质细胞可在第4代后自发分化为成牙本质细胞表型；而添加10^6 U／L LIF的含血清培养基，可使小鼠牙乳头间充质细胞的未分化表型稳定至第9代。无论细胞是否出现牙向分化，表现成牙间充质细胞特性的Msx1／Msx2、Pax9、Lhx6／Lhx7均有表达；而成牙本质细胞表型分化后尚能检测到DSPP、Sox9、Cbfα1、Osx等启动向矿化组织细胞终末分化的特异性基因表达。结论牙乳头间充质细胞的自发牙向分化模型可作为诱导其他成体间充质干细胞牙向分化时的阳性对照，其基因表达模式可为研究其他成体干细胞牙向分化后在基因水平上的变化提供佐证。     

犬根尖牙乳头干细胞的分离培养和生物学特性

的：分离培养比格犬（Beagle犬）根尖牙乳头干细胞并研究其生物学特性。方法：拔除Beagle犬上颌年轻恒前牙,切取根尖牙乳头,采用酶消化法分离培养Beagle犬根尖牙乳头细胞,进行成纤维细胞克隆形成实验、生长曲线测定、多向分化能力研究及间充质干细胞相关表面标记物STRO-1、CD146和CK的表达分析,并将其移植至免疫缺陷鼠皮下观察矿化组织的形成。结果：Beagle犬根尖牙乳头组织中存在一群具有高度增殖能力的细胞,在相同培养条件下,其克隆形成率明显高于人根尖牙乳头干细胞,差异具有统计学意义（P<0.001）;所获得Beagle犬根尖牙乳头干细胞具有成骨、成脂和成软骨等多向分化能力;在体外经成骨诱导后可形成矿化结节,成脂诱导后可形成脂滴,成软骨诱导后免疫组织化学染色Ⅱ型胶原阳性表达;同时该群细胞STRO-1和CD146阳性表达,而CK阴性表达;与羟基磷灰石混合移植于免疫缺陷鼠皮下可形成矿化组织和牙髓 牙本质复合体样结构。结论：Beagle犬根尖牙乳头中存在具有高增殖能力和多向分化能力的根尖牙乳头干细胞。     

人牙髓干细胞和根尖乳头干细胞体外分化能力的对比研究

目的 对比研究人牙髓干细胞(DPSCs)和根尖乳头干细胞(SCAP)的体外生长特性、增殖及矿化能力.方法 采用酶消化法体外培养人DPSCs和SCAP,诱导分化培养基诱导细胞成骨/成牙本质向分化,流式细胞仪检测特异性标记物,茜素红染色检测矿化程度,逆转录PCR(RT-PCR)检测分化标记物表达.结果 人DPSCs和SCAP为成纤维细胞样贴壁生长,SCAP增殖率较高;两种细胞表达特异性间充质干细胞(MSCs)标记物:CD34、CD45(-),CD90、CD105、CD146(+),基质细胞抗原1(STRO-1)、八聚体转录因子4(OCT-4)(+),SCAP特异性标记物CD24(+).成骨诱导3周可形成明显钙化结构,SCAP钙化能力较强.成骨诱导2周2种细胞均可表达分化标记物:骨涎蛋白、骨钙素、牙本质涎磷蛋白,且随诱导时间表达逐渐增加.结论 人DPSCs和SCAP均具有间充质干细胞典型特征,可分化为成牙本质样细胞,是牙源性组织工程的可靠于细胞来源.     

IGF-1、bFGF对人牙髓干细胞的体外诱导分化的影响

目的研究IGF-1、bFGF对人牙髓干细胞分化的影响.方法酶消化法获得人牙髓干细胞,形态学观察,计算细胞克隆形成率;第3代牙髓干细胞,以IGF-1、bFGF细胞因子诱导,免疫组化染色和RT-PCR方法检测牙本质涎蛋白(dentin sialoprotein, DSP)、牙本质基质蛋白1(dentin matrix protein 1, DMP-1)和牙本质涎磷蛋白(dentin sialophosphoprotein, DSPP)的mRNA的表达.结果人牙髓干细胞呈集落状生长,在体外具有一定的克隆形成能力,经细胞因子刺激后细胞表达DSP、DMP-1蛋白和DSPP的mRNA.结论人牙髓组织中有呈克隆样生长的成体干细胞,IGF-1、bFGF可诱导人牙髓干细胞定向分化.     

牙髓细胞成牙本质向分化过程中DSPP基因的表观遗传学修饰

目的:通过检测牙髓细胞(DPC)体外成牙本质向分化过程中牙本质涎磷蛋白(DSPP)基因的表观遗传学修饰模式的变化。探讨表观遗传学机制在DPC成牙本质向分化中的作用。方法:在体外诱导DPC成牙本质向分化,采用Real-time PCR检测DSPP基因表达的改变,采用重亚硫酸盐测序法检测DSPP基因的甲基化水平改变,染色质免疫共沉淀检测DSPP启动子区组蛋白修饰(H3K27me3和H3K4me3)修饰的变化。结果:在DPC诱导分化后,DSPP的表达逐渐增高,伴随着基因启动区甲基化水平的降低,同时与转录激活相关的组蛋白修饰H3K4me3升高,而与转录抑制相关的组蛋白修饰H3K27me3降低。结论:DPC在成牙本质分化过程中DSPP表达的上调与DSPP启动子区域出现开放基因表达的表观遗传学修饰模式有关。这提示,表观遗传学调控参与到DPC成牙本质向分化的过程。     

Value of D-Dimers in patients with acute aortic dissection

Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P ＜ 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (＞0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P ＜0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P ＜ 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.     

Research of combined liver-kidney transplantation model in rats

Objective： To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods： SD rats served as both donors and recipients. 4℃ sodium lactate Ringer＇s was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava （IVC） inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results： Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion： This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.     

BLOOD PRESSURE CHANGE WITH AGE IN SALT-SENSITIVE TEENAGERS

Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P＜ 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P＜ 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.     

Development on Adjustable Calibration Marker for Shock Wave Focus

Shock wave lithotripsy （SWL） is a treatment of choice for upper urinary stones. However, this procedure is inappropriate for obese patients because the focus is often unable to reach the target owing to the limited focal distance in shock wave source. Although treating such patients in a blast path may increase the application length of shock wave source, it＇s difficult to find this path on the lithotripter monitor. For this reason, we invented an adjustable calibration marker in order to set an effective focus in the shock wave hath.     

Study on the TCM Pathogenesis of Angiopathic Complications of Type II Diabetes

Excess production of reactive oxygen species(ROS)of mitochondrion mediated by hyperglycemia is the common pathogenesis of angiopathic complications of diabetes.TCM holds that the damp from the dysfunction of spleen.kidney and liver is the causative factor of complications of diabetes.This is similar to the mechanism of Ros resulting in angiopathic complications of diabetes.When the angiopathic complications of type II diabetes mellitus(T2DM)are difierentiated as caused by turbid damp in TCM can be explained as ROS.Since the obstruction of pathogenic damp in channels and collaterals is said to be the main pathogenesis,the treating principle should be dissolving the damp to remove the obstruction.     

Leptin, Ghrelin and TNF-α before and after Hypo-caloric Traditional Chinese Diet and Auricular Acupuncture

INTRODUCTION Obesity is a complex emergent problem, which can be possibly solved not only by the diet but also by the life style and promotion of a constant physical exercise. 1, 2 No doubt careful attentions must be given to the nutritional condition of obese people, the dietary habits, the somatic build (i.e. distribution of fat mass) and the organic functions linked to formation of the fat mass. All the parameters should be constantly monitored before, during and after a diet treatment. 3, 4, 5     

Relationship between Dysglycemia and Carotid Atherosclerosis in Tibetan Population

People with dysglycemia are at high risk for atherosclerotic diseases. This study aims at investigating the atherosclerotic vascular damage in dysglycemia and its metabolic origin in Tibetan population.     

APPLICATION OF LORNOXICAM TO PATIENT-CONTROLLED ANALGESIA IN PATIENTS UNDERGOING ABDOMINAL SURGERIES

FOR anesthesiologis s ,treatingpostoperativepainhas alwaysbeen a problem.Althoughopioidshave been provedtobe effective,theirsideeffectscouldnotbeignored.With thedevelopmentofscienceand pharmacology,many drugs with aspectsof satisfactoryanalgesicefficacyand couldbe welltoleratedby patientshave been developed.And lornoxicamisone of them, which isa non-steroidalanti-inflammatorydrug (NSAID ), with analgesic, anti-infl-ammatory,andantipyreticproperties.Itseliminationhalf-time(3 to 5 hours) isle…     

安心颗粒对急诊经皮冠状动脉介入术后生活质量影响的研究

目的：评价使用安心颗粒对急诊经皮冠状动脉介入术（PPCI）术后生活质量的影响.方法：将160例接受PPCI的急性ST段抬高型心肌梗死患者随机分为安心颗粒组（术前顿服安心颗粒8.8g,术后安心颗粒4.4 g/次,每日2次）和对照组（仅接受基础药物治疗）.所有患者均服用阿司匹林、氯吡格雷和阿托伐他汀.分别在入院时、出院前1d、出院后180 d时,应用心肌梗死多维度量表（MIDAS）、中文版SF-36评价量表对患者生活质量评分.并观察术后30 d以内的出血并发症、血小板减少症发生情况.结果：入院时和出院前1d,两组患者的心肌梗死MIDAS、SF-36量表评分比较无差异（P＞0.05）;出院后180 d时,与对照组比较,安心颗粒组MIDAS、SF-36评分明显减低（P＜0.05）;组内与入院时比较,两组出院前1d、出院后180 d时,MIDAS、SF-36评分均降低（P＜0.05）.两组患者在随访期间均无大量出血、少量出血、重度和极重度血小板减少症发生,安心颗粒组有4例、对照组有7例发生不明显出血（P＞0.05）.两组发生轻度血小板减少症的患者数比较无差异（P＞0.05）.结论：PPCI使用安心颗粒,能改善急性ST段抬高型心肌梗死患者的生活质量,且不增加出血风险.     

CLINICAL SIGNIFICANCE OF SERUM CYTOKINES IL-1β,sIL-2R,IL-6,TNF-α,AND IFN-v IN ACUTE CORONARY SYNDROME

Objectives To explore serum cytokines levels (including IL-1 β, sIL-2R, IL-6, TNF-α, and IFN-v) and their significance in patients with acute coronary syndrome (ACS) and the subsequent follow-ups, with attempt to estimate the role of various serum inflammatory markers in the diagnosis and assessment of ACS.Methods The study population include 40 patients with acute myocardial infarction (AMI), 40 patients with unstable angina pectoris (UAP), and 40 controls. Among the 80 patients, 60 patients attended a follow up 4 months later. Serum inflammatory markers including IL-1 β, sIL-2R, IL-6, TNF-α, and IFN-v were measured by enzyme linked immunosorbent assay.Results Serum IL- 1 β, sIL-2R, IL-6, TNF-α were significantly higher in AMI group or UAP group compared to the control group and became significantly lower 4 months later in the follow-up patients. Serum levels of IFN-v shows no significant difference between AMI group or UAP group and controls, also showing no significant change when measured in follow up patients. There was no correlation between serum creatine kinase-MB isoenzyme levels and serum inflammatory markers either in UAP or AMI group. Furthermore, when divided into two subgroups using Wagner's QRS scoring system in the AMI group, there is no difference of each serum inflammatory marker between ≤ 6 scores group and ＞ 6 scores group.Conclusion Serum levels of certain inflammatory markers may have some diagnostic value for ACS, and can be a useful marker reflecting disease stability.