内皮细胞细胞外基质改性钛表面内皮细胞和血小板的生长行为

实验结合碱活化和钛表面原位构建人脐静脉内皮细胞(HUVECs)细胞外基质(extracellular matrix,ECM)的方法制备细胞外基质改性的粗糙钛片(Ti-OH-ECM),然后比较粗糙钛(Ti-OH)表面和光滑钛(Ti,对照组)表面构建ECM前后的表面形貌、亲疏水性变化、官能团表征、细胞相容性和血液相容性。结果表明,ECM在钛表面构建成功,粗糙钛表面接触角降低至9°,ECM改性后,粗糙钛片的接触角有显著的增高,具有统计学意义(P0.01);并且ECM在粗糙钛表面沉积的量显著大于对照组表面(P0.01);1 d和3 d的细胞荧光染色结果表明,粗糙钛表面抑制内皮细胞黏附,但是ECM改性后的粗糙钛表面内皮细胞黏附数量高于对照组改性后的表面,并且具有统计学意义(P0.05);与粗糙钛表面比较,ECM改性后的粗糙钛促进平滑肌细胞粘附及增殖;另外,2 h的血小板黏附结果表明,与对照组相比,粗糙钛的血小板黏附数量显著减少(P0.01),ECM改性后的粗糙钛表面进一步抑制血小板黏附及激活(P0.05)。因此,细胞外基质改性的碱活化钛为生物医疗器械提供了一定的研究基础。     

聚氨酯多孔涂层制备与表征

利用相转变原理以及湿相浇铸法制备聚氨酯致密和多孔涂层.观察结果表明多孔样品的表面形貌如孔径等主要受质量分数和空气相对湿度的影响.为测试聚氨酯涂层的性能,将样品在Hank's模拟体液中进行浸泡实验,并且对不同样品的亲水/疏水性以及血液相容性进行检测.结果表明在相转变过程中聚氨酯多孔涂层的孔径变化规则有序,并且孔径变化范围为1～30 μm.在Hank's模拟体液中浸泡3个月之后,聚氨酯多孔涂层表面基本没有变化并且涂层没有从基体表面脱落.接触角测量结果表明多孔涂层表面呈强疏水性.此外聚氨酯多孔涂层的血小板粘附量最少,并且延长了抗凝血时间,说明其具有良好的血液相容性.     

In vitro enhancement of human platelet aggregation by somatostatin

Summary Very low concentrations of somatostatin (S-14) strongly potentiate the in vitro aggregation induced by collagen, ristocetin and arachidonic acid, but not that induced by ADP or epinephrine, in both human platelet rich plasmas and gel-filtered platelet preparations. Desensitization phenomena may be induced either by repeated addition of S-14 or long lasting contact between S-14 and platelets.     

黔金丝猴凝血机制的测定分析

试验材料采用贵州梵净山国家级自然保护区野生动物救护中心饲养三年的五只黔金丝猴，取下肢静脉血，氏染色后用目视法进行血小板计数。通过病理彩色图象分析和统计分析，比较黔金丝猴的凝血机制同人类，猕猴，藏猷猴和滇金丝猴的凝血机制有无显著性差异及黔线猴性别和龄 凝血机制的个体差异。     

前列腺素E1与心肌保护研究进展

本文通过阐述前列腺素E1（PGE1）对缺血性心肌损伤及缺血再灌注过程中的抗炎作用，抑制血小板功能，减少氧自由基的产生，减轻钙超载等重要环节的影响，以及减轻细胞凋亡的调节作用等，揭示其在心肌保护中的作用机制。     

Correlation between platelet gelsolin levels and different types of coronary heart disease

Gelsolin is an important cytoskeletal protein of platelets and studies have shown a close relationship between gelsolin and cardiovascular disease.However,the role of gelsolin in the development of coronary heart disease(CHD) is unclear.In this study,we record the distribution of gelsolin in human platelets and plasma and its association with different types of CHD.This study included 114 cases,with 33 stable angina pectoris(SAP) cases,81 acute coronary syndrome(ACS) cases—composed of 39 unstable angina pectoris(UAP) and 42 acute myocardial infarction(AMI) cases,and 31 healthy control participants.Gelsolin concentration in platelet rich plasma(PRP) and platelet poor plasma(PPP),actin filament(F-actin) and Gc-globulin of PPP were determined by enzyme-linked immunoadsorbent assay(ELISA).The fluorescence intensity of CD62p and cytoplasmic calcium([Ca2+] i) in human platelets measured by flow cytometry.We also used turbidimetry to detect the platelet aggregation rate(PAR).We analyzed the correlation between platelet gelsolin concentration and CD62p or plasma F-actin levels among each different patient group.Compared with the control group,the gelsolin level in PRP of UAP and AMI groups increased significantly(P<0.01),while the gelsolin level in PPP of all the three patient groups decreased markedly(P<0.01),and the CD62p,PAR,[Ca2+] i of platelets,F-actin and Gc-globulin of the UAP and AMI groups increased significantly(P<0.01).Compared with the SAP group,the gelsolin level in PRP,the PAR,[Ca2+] i of platelets and CD62p of other two groups increased significantly(P<0.01),F-actin of the AMI group increased markedly(P<0.01).Platelet cytoskeleton protein dynamics vary among the different types of CHD.Platelet gelsolin levels are markedly increased and accompanied by increased platelet activity,F-actin and [Ca2+] i of ACS patients,while gelsolin levels in PPP are markedly lower.Abnormally increased platelet gelsolin levels show high positive correlation with the level of platelet activity.Therefore,platelet gelsolin might be a novel molecular marker and/or a new potential therapeutic target of anti-platelet therapy of ACS.     

血小板体积对血小板聚集功能影响的研究

通常人群中血小板平均体积8.65±1.44fl超过这一范围被称为大血小板。在实验中发现,平均血小板体积较大者一分钟聚集率,五分钟聚集率,最大聚集率,到达最大聚集率的时间以及Ⅱ相聚集出现的时间均与正常人群血小板的聚集程度有显著的差异。     

［5－（4－甲脒－苄基）－2，4－二氧代－咪唑烷－3－基］－乙酰基－L－天冬氨酰－L－缬氨酸的合成

根据由精氨酸－甘氨酸－天冬氨酸组成的肽能抑制血小板聚集的机制，设计并合成了［５－（４－甲脒－苄基）－２，４－二氧代－咪唑烷－３－基］－乙酰基－Ｌ－天冬氨酰－Ｌ－缬氨酸（９）。生物试验结果表明：（９）抑制血小板聚集作用最强，其活性以ＩＣ＿（５０）值相比，强于类似物。     

血液病患者输注去白细胞机采血小板疗效分析

研究血液病患者输注去除白细胞机采血小板对提高临床疗效的作用。选取解放军总医院2007年12月至2008年12月血液科所有输注机采血小板血液病患者274例(2029例次),根据输注的机采血小板是否去除白细胞分为去白组和未去白组。对两组输注前后24 h内病人血小板计数资料进行比较,用计算校正血小板增高指数值(CCI)来判断输注血小板是否有效。以输注后的临床表现来判断是否发生输血反应。结果两组输注血小板患者的血小板计数与输注前比较均有显著提高(p<0.01)。去白组有效率显著高于未去白组(p<0.01)。去白组NHFTR发生率亦显著低于未去白组(p<0.05)。说明去白组血小板输注疗效优于未去白组,而且能够显著降低NHFTR的发生率。     

冰冻血小板融解后出现絮状物的原因分析

为找出冰冻血小板融解后出现絮状物的原因,文章对相关的影响因素进行了探讨．结果表明,影响冰冻血小板融解后出现絮状物的影响因素是多方面的,献血者血小板计数、融解温度、脂肪血、二甲基亚砜注入速度和操作状况对血小板质量均有一定影响．