人骨髓间充质干细胞分离培养及多向分化的实验研究

目的:探索体外分离子与培养人骨髓间充质干细胞的方法,同时研究其细胞生物学特性,分析其作为骨组织工程种子细胞的可行性。方法:分离人骨髓间充质干细胞(human bone marrow mesenchymal stemcells,hBMSCs),通过常规培养,在体外观察其生长特性、抗原表达等特征;然后通过条件培养基定向诱导,观察其分化潜能。结果:人骨髓间充质干细胞在体外可以大量增殖,常规培养条件下,原代培养需要2～3周,转代后生长速度加快;应用流式细胞仪检测MSCs的表面抗原,CD44、CD29、CD105阳性,CD45、CD06、CD34以及HLA-DR阴性;在相应条件培养基的诱导作用下,MSCs可以分化为成骨细胞、软骨细胞以及神经细胞。结论:人骨髓间充质干细胞可以从骨髓中分离并在体外培养增殖,同时在体外具有多向分化潜能,可以分化成为骨细胞,符合骨组织工程种子细胞的要求。     

人牙周膜干细胞的分离培养及鉴定

目的:探讨人牙周膜干细胞的多向分化潜能。方法:体外分离培养人牙周膜细胞,光镜下及HE染色鉴定细胞形态学特征。免疫组化法检测波形蛋白、角蛋白、CD44的表达。成骨诱导法培养人牙周膜干细胞向成骨细胞分化。结果:体外成功分离培养人牙周膜干细胞。角蛋白阴性表达,波形蛋白阳性表达,CD44阳性表达。诱导成骨结果显示人牙周膜干细胞具有潜在的多向分化潜能。结论:人牙周膜干细胞在体外可以诱导分化为成骨样细胞,具有多向分化的潜能。     

人骨髓基质干细胞体外培养和生物学特性鉴定

目的 体外分离、纯化培养人骨髓基质干细胞(hBMSCs),对其表面标志物、多向分化特性进行鉴定,为骨组织工程提供理想的种子细胞来源.方法 抽取健康成人骨髓,采用全骨髓培养法,多次消化以纯化hBMSCs;应用流式细胞仪对细胞表面标志物进行检测;采用成骨、成软骨和成脂培养基进行三向诱导分化.结果 培养的第3代细胞表面抗原检测显示:表达CD106、CD166和CD29,不表达造血和内皮标志CD34、CD45和CD145在体外分别诱导出其向成骨、成软骨和成脂肪细胞分化.结论 hMSCs体外经分离传代培养后细胞成分较为单一,具有多向分化潜能,符合间充质干细胞的基本功能特征.     

人类年轻恒牙牙髓干细胞体外多向分化的能力

目的:从人类的年轻恒牙中分离、培养牙髓间充质细胞,并探讨其基本的干细胞生物学特性及体外的多向分化能力.方法:对人类的正畸减数年轻恒前磨牙中分离培养的牙髓细胞进行相差显微镜和透射电镜观察,利用流式细胞仪分析牙髓间充质细胞表型特征和细胞周期时相,并在体外进行定向诱导.结果:从年轻恒牙牙髓中分离培养得到的牙髓间充质细胞为成纤维样;细胞器发育较好;有间充质干细胞的表面特征:CD90,CD44和CD147阳性细胞的比例很高,CD34,CD38,CD45和 HLA-DR的阳性比例很低;有很强的增殖生长能力;经体外诱导年轻牙髓细胞可在体外向成骨细胞、脂肪细胞和神经细胞分化,但不能被诱导成为软骨细胞.结论:从人类年轻恒牙牙髓中可以分离培养得到的牙髓间充质干细胞,具有较高的增殖能力和间充质干细胞表面特征,在体外诱导下能分化为成骨细胞、脂肪细胞和神经元,具有多向分化的潜能.     

人脐带间充质干细胞生物学特性及向成骨细胞分化的研究

目的:体外分离、纯化及培养人脐带间充质干细胞(WJ～MSCs),观察其生物学特性并研究其定向分化成成骨细胞的能力。方法:将剔除动静脉的新鲜人脐带组织切成小段,剥离血管后酶解,释放细胞贴壁生长,倒置显微镜观察细胞形态,绘制第3代生长曲线;流式细胞仪测定细胞表面标记(CD105、CD73、CD90、CD34、CD45、CD14和HLA～DR);化学染色检测其体外诱导成骨分化的能力。结果:原代人脐带间充质干细胞呈现典型的成纤维样形态;流式细胞仪检测培养细胞间充质干细胞的表面标志CD105、CD73和CD90阳性表达,但不表达造血细胞的表面标志CD34、CD45、CD14及HLA-DR阴性表达,HLA-ABC低表达。体外诱导实验证实,该细胞具有成骨分化能力。结论:WJ-MSCs体外诱导成骨能力确切,具有类似骨髓间充质干细胞的特异性表面标记,且具有同种异体移植的低免疫原性。     

兔骨髓间充质干细胞培养与多向分化潜能鉴定的实验研究

目的原代培养兔骨髓间充质干细胞(mesenchymal stem cells,MSCs),观察体外培养中MSCs的生物学特性及多向分化潜能。方法通过密度梯度离心联合贴壁培养法,体外分离、纯化、扩增兔骨髓间充质干细胞,观察形态学特点,测绘传代MSCs生长曲线,检测细胞周期及表面标记,体外诱导MSCs向成骨细胞、成脂肪细胞分化并鉴定。结果原代及传代MSCs为长梭形成纤维细胞样细胞;生长曲线显示传代细胞具有类似的生长规律;流式细胞仪分析MSCs CD44表达阳性,CD45表达阴性;细胞周期分析显示87%以上细胞处于G0/G1期;经成骨细胞诱导,细胞碱性磷酸酶染色阳性;经成脂肪细胞诱导,细胞内出现红染脂滴。结论通过密度梯度离心联合贴壁培养法可大量扩增、纯化MSCs,所获细胞具有高度自我更新和多向分化潜能。     

大鼠骨髓间充质干细胞多向分化潜能的研究

 目的 分离和培养大鼠骨髓间充质干细胞（marrow mesenchymal stem cells,MSCs）,并行多向分化潜能的鉴定。方法 经Percoll梯度分离法获得大鼠骨髓单个核细胞。贴壁培养后,通过倒置显微镜进行细胞形态学观察,并采用流式细胞术进行分析。传至第3代后,分别进行成脂肪细胞、神经元样细胞、血管内皮样细胞的诱导,并行免疫组织化学鉴定。结果 骨髓间充质干细胞大小较为均匀,基本上呈梭形或星形的上皮样细胞,传代培养后的细胞体积增大,成纤维样细胞逐渐增多。经反复传代纯化的MSCs检测CD71、CD29呈阳性表达并证实骨髓间充质干细胞经诱导后分化为脂肪细胞、神经元样细胞、血管内皮样细胞。结论 在体外,大鼠骨髓间充质干细胞具有多向分化潜能,可作为组织工程的种子细胞。     

脂肪来源干细胞分化潜能的现状研究

与骨髓间充质干细胞一样,来源于中胚层的脂肪,亦具有多向分化潜能,其内含有大量能自我更新和向多系分化潜能的细胞群称为脂肪来源干细胞.其取材方便,来源丰富,可在体外稳定增殖传代.并与骨髓间充质干细胞有相似的多向分化表面标志CD105、STRO-1以及CD166受体.研究发现它具有向多系分化潜能,除可以分化为间充质来源的脂肪...     

克隆化的人骨髓间充质干细胞系的建立及其生物学特性的研究

目的:分离人骨髓间充质干细胞(hMSCs),建立克隆化扩增的细胞系并初步鉴定其分化特性和细胞的分子标记.方法:利用间充质干细胞贴壁生长的特性,显微镜下挑取原代单个成纤维样生长单位中的细胞,逐步扩大培养,最终得到克隆化扩增的hMSCs.选择有利于其生长的血清,低密度培养,传70%～80%生长汇合时传代保种.RT-PCR检测其Oct-4、SDF1、CD49a、CK19、c-met基因的表达;流式细胞术检测细胞表面抗原CD34、CD45、CD14、CD44、CD29、CD90、HLA-1和HLADR;体外向骨、软骨、脂肪细胞方向诱导分化鉴定其分化潜能.结果:建立了人骨髓间充质干细胞系并在体外实现了克隆化扩增,该细胞系在体外连续培养达60个细胞倍增时间仍保持多向分化的潜能.细胞不表达CD34、CD45、CD14、HLA-DR,但表达Oct-4、SDF-1、CD49a、CK19、c-met、CD44、CD29、CD90、HLA-1.体外能诱导出骨、软骨、脂肪细胞.结论:得到了一个可稳定传代的克隆化扩增的人骨髓间充质干细胞系,该细胞系在体外可以分化为骨、软骨、脂肪细胞,并表达Oct-4、CK19和c-met.     

骨髓间充质干细胞多方向分化潜能实验研究

目的:分离和培养兔骨髓间充质干细胞(bone marrow mesenchymal stem cells,BMSCs),并向多向诱导分化。方法:经贴壁筛选法获得单个核细胞。贴壁培养后,通过倒置显微镜进行细胞形态学观察,并采用流式细胞术进行分析。传至第3代后,分别进行成脂肪细胞、成骨细胞、成软骨细胞诱导,并进行鉴定。结果:骨髓间充质干细胞大小较为均匀,基本上呈梭形,传代培养后的细胞体积增大,成纤维样细胞逐渐增多。经反复传代纯化的BMSCs经诱导后分化为脂肪细胞、成骨细胞、软骨细胞。结论:兔骨髓间充质干细胞在体外培养具有多向分化潜能,可作为组织工程学种子细胞进行相关实验研究。     

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.     

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     

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.     

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…     

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.     

Possible Spread of adenovirus type 3 from poultry to humans ：indirect evidence from an outbreak in China

Objective:To explore the epidemiology and etiology for an outbreak of acute respiratory tract infection that occurred in one county of Jiangsu Province, China 2004. Methods: Only cases meeting the case definition were included in the study. We reviewed the medical records of the cases who were admitted to the local hospitals, interviewed cases by a standard questionnaire, and then described the epidemiotogic features and analyzed risk factors by means of a case-control study. We collected pharyngeal swab specimens and sent them to different laboratories for isolation and culture. The laboratory used different detection methods such as DIP, PCR, electron microscope examination and microneutralization assay, to identify and then type the positive specimens. Results:A total of 871 cases were reported during the period from April 18 to July 4,2004. The distribution of onset times presented two peaks, one in late May and another in middle June. The epidemic occurred mainly in the elementary and junior high schools in ten townships of one county, and the mean age of the cases was 12 years (range 7 months to 18 years). The course of the disease was acute, and was characterized by fever accompanied with sore throat and tonsillitis. The WBC count of cases was normal or elevated. The mean duration of illness was 5 days (range 2 to 12 days). No fatalities from illness were reported. A case-control study indicated that the possible risk factors were close contact with a case and/or poultry before onset and sharing of towels among members of the family. The typical CPE was observed through inoculating pharyngeal swab specimens into the HEP-2 cell cultures in different laboratories. An infection of adenovirus type 3 was verified by detecting positive specimens in different methods. Conclusion:This investigation demonstrated that the acute respiratory infection in cases was caused by adenovirus type 3. Cases occurred in over 70 schools in ten townships in 2004, and the route of transmission was possibly close contact with cases or droplet transmission.