CD34+细胞在干细胞旁分泌下向内皮细胞分化的研究

Objective To study whether the paracrine action of umbilical cord-derived mesenchymal stem cells (UC-MSC) can induce differentiation of human umbilical cord blood-derived CD34+ cells into endothelial cells in vitro. Methods The 20 fresh umbilical cord blood samples were collected with volume of (103. 80 ± 19. 77) ml. CD34+ cells were isolated from the mononuclear cells by magnetic activated cell sorting system (MACS) , and mesenchymal stem cells (MSCs) were isolated from umbilical cord by collagenase and trypsin digestion. Three groups were set up: CD34+ cells pure culture group, cytokineinduced group and two stem cells co-culture group with noncontact. Results The average purity of enriched CD34+ cells as assessed by FACS was (95. 02 ± 3. 81) %. Freshly isolated CD34+ cells were small and round which suspended in culture medium. Attached cord-like structure cells of CD34+ cells appeared after 7 days coculture with noncontacted MSC, and when the CD34+ cells grew into large number, they formed colonies. These cells expressed endothelial specific markers, including CD144 (54. 40 ±4. 13)% ,vWF (47. 53 ± 3. 96) % , CD31 (65. 43 ± 5. 61) % ( P ＜ 0. 05, as compared with CD34+ cells pure culture group) , partially expressed CD34 and, the leukocyte common antigen CD45 was negatively expressed.Conclusion Human umbilical cord blood-derived CD34+ cells could be induced into endothelial cells under the paracrine action of umbilical cord-derive mesenchymal stem cells which has the same effect of cytokines.     

CD34+细胞在干细胞旁分泌下向内皮细胞分化的研究

目的 探讨人脐血CD34+细胞在脐带间充质干细胞(UC-MSCs)旁分泌作用下向内皮细胞诱导分化的可行性.方法 收集20份脐血,体积(103.80±19.77)ml.免疫磁珠(MACS)分选CD34+细胞;取脐带用消化贴壁法获得UC-MSC.流式鉴定干细胞表型.实验分单纯培养组、诱导组、共培养组.结果 流式鉴定CD34+细胞纯度(95.02±3.81)%.培养14 d流式检测共培养组表达CD31、CD144、VWF分别为(65.43±5.61)%、(54.40±4.13)%、(47.53±3.96)%(与单纯培养组比较P＜0.05),部分表达CD34,阴性表达CD45,这与诱导组及成熟脐静脉内皮细胞表达率一致.结论 UC-MSCs旁分泌作用与外源性细胞因子都具有促分化作用,均能使脐血CD34+细胞向内皮细胞分化.

Abstract：

Objective To study whether the paracrine action of umbilical cord-derived mesenchymal stem cells (UC-MSC) can induce differentiation of human umbilical cord blood-derived CD34+ cells into endothelial cells in vitro. Methods The 20 fresh umbilical cord blood samples were collected with volume of (103. 80 ± 19. 77) ml. CD34+ cells were isolated from the mononuclear cells by magnetic activated cell sorting system (MACS) , and mesenchymal stem cells (MSCs) were isolated from umbilical cord by collagenase and trypsin digestion. Three groups were set up: CD34+ cells pure culture group, cytokineinduced group and two stem cells co-culture group with noncontact. Results The average purity of enriched CD34+ cells as assessed by FACS was (95. 02 ± 3. 81) %. Freshly isolated CD34+ cells were small and round which suspended in culture medium. Attached cord-like structure cells of CD34+ cells appeared after 7 days coculture with noncontacted MSC, and when the CD34+ cells grew into large number, they formed colonies. These cells expressed endothelial specific markers, including CD144 (54. 40 ±4. 13)% ,vWF (47. 53 ± 3. 96) % , CD31 (65. 43 ± 5. 61) % ( P ＜ 0. 05, as compared with CD34+ cells pure culture group) , partially expressed CD34 and, the leukocyte common antigen CD45 was negatively expressed.Conclusion Human umbilical cord blood-derived CD34+ cells could be induced into endothelial cells under the paracrine action of umbilical cord-derive mesenchymal stem cells which has the same effect of cytokines.     

CD34+细胞在干细胞旁分泌下向内皮细胞分化的研究

Objective To study whether the paracrine action of umbilical cord-derived mesenchymal stem cells (UC-MSC) can induce differentiation of human umbilical cord blood-derived CD34+ cells into endothelial cells in vitro. Methods The 20 fresh umbilical cord blood samples were collected with volume of (103. 80 ± 19. 77) ml. CD34+ cells were isolated from the mononuclear cells by magnetic activated cell sorting system (MACS) , and mesenchymal stem cells (MSCs) were isolated from umbilical cord by collagenase and trypsin digestion. Three groups were set up: CD34+ cells pure culture group, cytokineinduced group and two stem cells co-culture group with noncontact. Results The average purity of enriched CD34+ cells as assessed by FACS was (95. 02 ± 3. 81) %. Freshly isolated CD34+ cells were small and round which suspended in culture medium. Attached cord-like structure cells of CD34+ cells appeared after 7 days coculture with noncontacted MSC, and when the CD34+ cells grew into large number, they formed colonies. These cells expressed endothelial specific markers, including CD144 (54. 40 ±4. 13)% ,vWF (47. 53 ± 3. 96) % , CD31 (65. 43 ± 5. 61) % ( P ＜ 0. 05, as compared with CD34+ cells pure culture group) , partially expressed CD34 and, the leukocyte common antigen CD45 was negatively expressed.Conclusion Human umbilical cord blood-derived CD34+ cells could be induced into endothelial cells under the paracrine action of umbilical cord-derive mesenchymal stem cells which has the same effect of cytokines.     

社区医务人员对医院信息化管理的知信行调查

目的 从社区医务人员的角度了解医院信息化管理的利弊及其使用需求.方法 利用问卷调查、小组讨论和个人深入访谈等定量和定性相结合的方法,对103名北京市某三甲医院社区门诊的医务人员进行调查,了解其对医院信息化管理的认知、态度以及对目前医院正在推广使用的门诊医生工作站的看法和建议.结果 总体来说,社区医务人员对医院信息化管理持较认可和接受的态度.系统本身的便捷性和稳定性、信息的可利用性,医务人员对医院信息化管理的态度、对电脑操作的熟练程度及使用成本、医院推行力度等因素会影响门诊医生工作站的使用.结论 应采取积极措施进行系统及设备优化、员工培训,并加强相关的医务和后勤管理.医院信息化管理软件的引进和开发应始终坚持以需求为导向的原则,并需要各方相关人员的全程参与.     

原发性高血压患者血清hs-CRP和ET-1、NO检测的意义

【目的】探讨原发性高血压（EH）患者血清超敏C反应蛋白（hs-CRP）和内皮素-1（ET-1）;一氧化氮（N0）变化的临床意义。【方法】对60例EH患者进行血清hs-CRP和ET-1、NO测定,并与健康对照组作比较分析。【结果】与对照组比较,EH组血清hs-CRP、ET-1明显升高,且随高血压分级升高而逐渐升高（P〈0．01）;血浆NO明显降低,且随高血压分级升高而逐渐降低（P〈0．01）。【结论】高血压病与炎症活动及血管内皮功能紊乱有关,血清hs-CRP和ET-1、NO是反映EH患者代谢异常的重要指标,可用于评估其病情的严重程度。     

高血压病患者病情与血清MDA、SOD水平的关系

原发性高血压(EH)是最常见的心血管疾病，常可引起严重的心、脑、肾等并发症。本文观察了90例EH患者的血清超氧化物岐化酶(SOD)活性、丙二醛(MDA)含量变化，旨在探讨血清MDA、SOD水平变化与EH病情的关系，期望对防治EH有一定帮助。     

天麻钩藤饮对高血压病患者血压及血清过氧化氢酶的影响

目的 :观察天麻钩藤饮对肝阳上亢型高血压病患者血压及其抗氧化酶系统的影响。方法 :选择肝阳上亢型高血压患者 6 0例 ,随机分为天麻钩藤饮组 (中药组 )和非洛地平组 (西药组 )各 30例 ,治疗 4周 ,分别检测治疗前后患者血压和血清过氧化氢酶 (CAT)的活力变化。结果 :治疗后 ,2组血压均明显下降 ,组间比较差异无显著性 (P >0 .0 5 ) ,而中药组CAT的升高却较西药组明显 (t=15 .94 ,P <0 .0 1)。结论 :天麻钩藤饮对肝阳上亢型高血压病患者具有良好降压效果 ,并且能增加CAT活力 ,清除过多的氧自由基 ,防止血管内皮细胞的脂质过氧化。     

缺氧预处理对脐带间充质干细胞bFGF分泌的影响

目的 探讨氯化钴(CoCl_2)模拟缺氧预处理对人脐带间充质干细胞(UC-MSCs)碱性成纤维生长因子(bFGF)分泌的影响.方法 分离、培养人UC-MSCs,显微镜观察其形态学特征,并运用流式细胞仪检测其表面标志物的表达;选取P3代健康人UC-MSCs,MTT法检测不同浓度(0、50、100、150、200、250μmol/L)CoCl_2对UC-MSCs活力及增殖的影响,然后将细胞分为4组,分别采用0、50、100、150μmol/L CoCl_2处理,于24、48、72h后检测bFGF蛋白及mRNA的表达并分析各组间的差异.结果 经适当浓度(≤150μmol/L)CoCl_2处理后,UC-MSCs生长加快,平台期提前,而高浓度(>200μmol/L)CoCl_2对细胞活力有负面影响.经50、100、150μmol/L CoCl_2处理后,各组bFGF蛋白分泌水平均明显高于0μmol/L CoCl_2处理组(P<0.05),且48、72h时点均高于24h时点(P<0.05),150μnol/L CoCl_2处理组72h时点bFGF蛋白表达水平明显低于48h(P<0.05),100μmaol/L CoCl_2处理组72h时点bFGF蛋白表达水平明显高于48h(P<0.05),而50μmol/LCoCl_2处理组72h时点与48h时点比较无显著差异.bFGFmRNA表达改变与蛋白基本相一致,但50μmol/L CoCl_2处理组在各时点没有显著差异.结论 适当浓度(≤150μmol/L)的CoCl_2对UC-MSCs增殖能力影响较小,可用于细胞模拟缺氧;缺氧预处理对人UC-MSCs的bFGF分泌有一定促进作用.     

对“解剖学”一书的意见

张鋆教授所编著的医士学校教本——解剖学,由於以局部解剖学的编写方法编著,自出版後,曾先後接到许多读者来信,认为本书在教学工作上是不适用的,加以著者本人为此亦曾於去年提出绝版的要求,因此已从去年将此书绝版。但为帮助读者明确今後解剖学的教学方向。特将此书评发表。     

穴位埋线治疗重型颅脑损伤康复期患者临床观察

目的:观察穴位埋线法治疗重型颅脑损伤康复期患者的临床疗效.方法:将60例重型颅脑损伤康复期患者随机分成治疗组和对照组(每组30例),两组均常规药物和康复治疗,治疗组加用穴位埋线治疗,通过治疗前后Fugl-Meyer运动评分(FMA)、修订的Barthel指数(MBI)评分的变化对两组患者功能康复进行评价并比较两组疗效.结果:治疗组患者的总有效率为93.3%,明显高于对照组的70.0%(P<0.01),FMA、MBI评分也优于对照组(P<0.05).结论:穴位埋线对重型颅脑损伤康复期患者疗效明显,可以促进运动功能和日常活动能力的恢复.