脐带血重建造血潜能的母体及新生儿因素分析

脐带血作为一种备选的移植用造血干细胞,能否成功植入与输入受者体内的总有核细胞（total nucleated cells,TNC）数、CD34＋细胞数及粒-巨噬细胞集落形成单位（colony-forming unit-granulocyte-macrophage,CFU-GM）有关。本研究探讨影响脐带血造血潜能的母体及新生儿因素。按照广州脐血库标准化操作常规（SOP）,对脐带血样本进行筛选、处理、检测及冷冻,回顾性分析已保存的4615份脐带血样本的造血细胞参数及其与母体及新生儿特征的相关性。结果表明：脐带血采集量（Mean±SD：95.23±22.42ml;Median：91.85ml）与处理前TNC[Mean±SD：（1.34±0.49）×109;Median：1.25×109]及处理后TNC[Mean±SD：（1.21±0.42）×109;Median：1.14×109]、CD34＋细胞数[Mean±SD：（5.14±4.55）×106;Median：4.08×106]、CFU-GM[Mean±SD：（9.72±8.66）×105;Median：7.53×105]三者均显著相关（p〈0.001）。在供者因素中,只有婴儿出生体重与脐带血采集量及造血细胞参数均呈显著正相关（p〈0.001）,较大婴儿的脐带血在采集量、TNC、CD34＋细胞数及CFU-GM方面均呈现优势（p〈0.001）。母亲年龄与上述各项参数均无显著相关。孕龄与处理前/后TNC正相关（p〈0.001;p〈0.001）,与CD34＋细胞数呈负相关（p=0.04）,而与采集量及CFU-GM均无显著相关。剖宫产时采集的脐带血量虽然高于阴道分娩（Mean±SD：97.05ml±22.23mlvs.92.53ml±22.43ml;Median：94.08mlvs.88.82ml;p〈0.001）,但各细胞参数均低于阴道分娩（p〈0.001）。男婴脐带血的采集量和CD34＋细胞数高于女婴（Mean±SD：96.41ml±22.31mlvs.93.95ml±22.47ml;Median：93.27mlvs.90.14ml;p〈0.001）;[Mean±SD：（5.28±5.04）×106vs.（5.00±3.94）×106;Median：4.18×106vs.3.94×106;p=0.042]、但处理前TNC及处理后TNC均低于女婴[Mean±SD：（1.31±0.50）×109vs.（1.37±0.47）×109;Median：1.22×109vs.1.28×109;p〈0.001];[Mean±SD：（1.18±0.42）×109vs.（1.24±0.41）×109;Median：1.10×109vs.1.17×109;p〈0.001],二者CFU-GM的差异无统计学意义。结论：本研究数据有助于优化脐带血供者筛选及提高脐血库资源利用率。脐血库应侧重选择体重较大、阴道分娩的新生儿供者,优先处理采集量大、TNC高的脐带血样本。     

健康供者特征对rhG-CSF预激的骨髓采集物CD34+细胞和T细胞亚群的影响

目的 探讨健康供者特征对rhG-CSF预激的骨髓(G-BM)采集物造血和免疫细胞成分的影响.方法 150名健康供者体内应用rhG-CSF 5 μ·kg-1·d-1连续4～5 d,第4,5天采集骨髓和外周血,用流式细胞术测定G-BM采集物中的CD3+、CD3+CD4+、CD3+CD8+、CD14+、CD34+细胞以及CD3+CD4-CD8-调节性T细胞的数量,并分析供者性别、年龄、体重、是否妊娠等特征对G-BM成分的影响.结果 150名健康供者G-BM所含有核细胞,淋巴细胞,CD3+、CD3+CD4+、CD3+CD8+、CD14+、CD34+细胞以及CD3+CD4-CD8-调节性T细胞的中位值分别为31 050(12 200～58 100)、2122(506～6618)、1344(307～4791)、692(145～3038)、616(112～2575)、986(265～2958)、63(11～505)和83(9～390)/μl.年龄≤38岁的供者G-BM中的有核细胞、CD34+细胞以及CD3+ CD4-CD8-调节性T细胞的数量分别为33800(18600～57100)、76(22～505)和97(11～380)/μl,显著高于年龄＞38岁的供者[分别为28 000(12 200～58 100)、49(11～220)和65(9～389)/μl],P值分别为＜0.05,＜0.001和0.001.外周血单核细胞计数＞0.37×109 /L的供者G-BM中有核细胞的数量[33550(12 200～57 100)/μl]显著高于≤0.37×109 /L的供者[27 150(13 800～58 100)/μl](P=0.005).多因素分析显示年龄和外周血单核细胞是G-BM中有核细胞采集量的影响因素[HR值分别为0.41和2.87;P值分别为0.01和0.003];年龄是G-BM中CD34+细胞采集量的唯一影响因素(HR=0.26;P值=0.001);年龄还是G-BM中CD3+ CD4-CD8-调节性T细胞数量的影响凶素[HR值为0.31;P=0.001].结论 年龄是影响G-BM中有核细胞、CD34+细胞和CD3+ CD4-CD8-调节性T细胞采集数量的因素,年龄≤38岁的供者更易采集满足临床需要的有核细胞和CD34+细胞;外周血单核细胞＞0.37×109 /L的供者采集的G-BM含有较多数量的有核细胞.     

151例淋巴瘤外周血造血干细胞采集影响因素分析

目的:分析淋巴瘤患者外周血干细胞动员采集过程中各相关因素对干细胞采集量的影响,以期能更好地提高病人干细胞采集的效率。方法:回顾性分析本院151例淋巴瘤患者外周血造血干细胞移植动员采集过程中各种因素对所采集的造血干细胞数量的影响。这些因素包括年龄、性别、身高、体重、病理类型、分期、动员方案、采集天数、输注血制品、病程时间及所经历化疗疗程等。结果:单因素分析发现,性别、身高、体重、病理类型、分期、动员方案、采集天数、血制品输注等对干细胞采集数量影响不显著;CD34~+细胞采集量和年龄显著相关(r=-0.248,P=0.002),年龄大于50岁后,CD34~+细胞的采集量下降明显,大于60岁CD34~+细胞采集量降低显著;患者患病病程时间和动员前所经历化疗疗程数对CD34~+细胞采集量有显著影响。每次CD34~+细胞采集量与采集前血常规指标中的WBC(r=0.053,P=0.527)无显著相关,但与单个核细胞百分数(r=0.260,P=0.002)和单个核细胞绝对值(r=0.338,P=0.00003)相关显著。结论:60岁以下,动员前化疗疗程较少,动员后单个核细胞数在(2-6)×109/L之间患者可能有更高的外周血造血干细胞采集量。     

2种血细胞分离机外周血干细胞采集效率的比较

目的 比较CS-3000 plus和COM.TEC血细胞分离机采集外周造血干细胞的效率.方法 56例检测标本均来自本院2011年自体外周血干细胞移植患者或异基因移植供者,其中CS-3000血细胞分离机采集33例,COM.TEC血细胞分离机采集23例.比较2组采集前供/患者的白细胞计数、红细胞压积;产品中白细胞数、单个核细胞比例、体外总循环量、产品体积、产品中MNC(单个核细胞总数)及单位循环量MNC、CD34+细胞总数及单位循环量CD34+.结果 CS-3000 plus与COM.TEC血细胞分离机采集产品中单个核细胞的比例有一定差异(P＜0.05),CS-3000 plus中单个核细胞比例高于COM.TEC血细胞分离机;CS-3000 plus产品体积显著小于COM.TEC 血细胞分离机产品体积(P＜0.05);按照单位循环量采集的细胞数,无论是以MNC还是CD34+细胞计算,2种机器采集效率的差异无统计学意义(P＞0.05),提示2种血细胞分离机均可采集足够的造血干细胞.结论 CS-3000plus和COM.TEC血细胞分离机在单个核细胞采集效率和CD34+细胞采集效率的差异无统计学意义.     

脐带血造血干细胞-196℃保存20年后质量分析

目的 探讨脐带血造血干细胞经液氮冻存20年后的质量情况.方法 对山东省脐带血造血干细胞库于2000年冰存的合格的脐带血200例出库进行检测,检测其母血、脐带血的乙肝表面抗原(HBsAg)、丙肝病毒抗体(抗-HCV)、梅毒螺旋体抗体(抗-T P)、人类免疫缺陷病毒抗体(抗-HIV)和巨细胞病毒(CM V)-IgM抗体;检测脐血的有核细胞数(TNC)、细胞活性、粒-单核细胞集落形成单位(CFU-GM)、CD34+细胞数量,以及血培养(细菌/真菌)检测,检测指标与冻存前指标进行比对,同时分析复苏后的检测指标是否符合现有的质量标准.结果 母血、脐带血的HBsAg、抗-HCV、抗-TP、抗-HIV和CMV-IgM抗体与入库时结果完全一致,均无反应性;脐带血的细菌/真菌培养无菌生长;冻存前T NC、细胞活性、CFU-GM、CD34+细胞数量分别为(11.2±4.8)×108、(99.5±1.3)％、(1.9±0.8)×106和(3.1±2.3)×106;冻存后的TNC、细胞活性、CFU-GM、CD34+细胞数量分别为(10.1±4.0)×108、(75.4±2.4)％、(1.4±0.6)×106和(2.4±2.1)×106,冻存后与冻存前比较,差异有统计学意义(P<0.05).结论 脐带血造血干细胞经过液氮冻存20年后,TNC、细胞活性、CFU-GM、CD34+细胞数量均有所下降,但是脐带血的多项指标仍然符合质量标准,细胞仍具有很强的增殖活性,能够满足临床需要.     

脐血复温后细胞输入剂量对植入的预测作用分析

本研究探讨非血缘供者脐带血移植(unrelated cord blood transplantation,UCBT)中复温后供者细胞输入剂量对植入和造血重建的预测作用。回顾性分析1999年8月至2010年4月间接受单份UCBT的97例儿童恶性及非恶性疾病患者的临床资料,比较冷冻前和复温后检测的总有核细胞(total nucleated cells,TNC)、CD34+细胞及粒-巨噬细胞集落形成单位(colony-forming unit-granulocyte-macrophage,CFU-GM)的输入剂量对受者的植入及造血重建速度的影响,供者脐带血均来自广州脐血库。结果表明,冷冻前TNC(/kg)(mean±SD:7.65×107±4.26×107;median:6.34×107)、CD34+细胞(/kg)(mean±SD:4.64×105±4.47×105;median:3.03×105)及CFU-GM(/kg)(mean±SD:0.79×105±1.09×105;median:0.57×105)与其对应的复温后TNC(/kg)(mean±SD:6.98×107±4.12×107;median:6.00×...     

异基因造血干细胞移植健康供者外周血干细胞二次采集时机探讨

目的 探讨健康供者体内应用rhG-CSF初次采集造血于细胞以后二次外周血造血干细胞采集的时机.方法 38例二次采集外周血干细胞的健康供者皮下注射rhG-CSF 5 μg·kg-1·d-1,连用5 d,在第5、6天采集外周血移植物(A组);A组供者初次采集时的资料作为对照(B组);A组供者依据初次和二次采集的75%间隔时间分为C组(≤9个月,n=30)和D组(>9个月,n=8).应用流式细胞术检测各组供者外周血采集物中的淋巴细胞,CD3+、CD3+CD4+、CD3+CD8+、CD14+、CD34+细胞以及CD3+CD4-CD8-T细胞的数量.结果 A组供者外周血采集物中淋巴细胞CD3+CD8+(25.51×108)和CD34+细胞(0.51×108)的中位含量显著低于B组(31.55×108和0.70×108,P<0.05);C组供者CD3+CD8+(23.42×108)和CD34+细胞(0.42×108)的中位含量显著低于B组(P<0.05);D组供者淋巴细胞,CD3+、CD3+CD4+、CD3+CD8+、CD14+、CD34+细胞以及CD3+CD4-CD8-T细胞的中位含量与B组的差异无统计学意义(P>0.05).A、C和D三组采集物中CD4+与CD8+细胞的比值、单核细胞与CD3+细胞的比值以及CD3+CD4-CD8-T细胞与CD3+细胞的比值与B组的差异均无统计学意义(P>0.05).38名健康供者初次和二次采集的间隔时间与二次采集物中的CD34+细胞存在显著的相关性(r=0.357,P=0.028).结论 健康供者二次采集外周血造血干细胞的时机以初次采集的9个月后为宜,9个月内采集应适当增加循环血量以保证移植物中的免疫和造血组分能满足临床需要.     

常见血常规指标与外周血造血干细胞采集效率的相关性分析

目的 分析患者部分术前常见血常规指标与外周血造血干细胞采集效率之间的相关性.方法 收集我科外周血干细胞采集患者(供者)样品32例次,检测采前血常规相关指标包括WBC、单个核细胞比例、Hct,并将这些指标与产品中CD34+细胞总数、单位循环量CD34+细胞数等指标进行相关性分析.结果 产品中单个核细胞相关指标与采前WBC、单个核细胞计数以及Hct均显著正相关,但在CD34+细胞水平,则与采前各血常规指标均无显著相关性.结论 就目前的采集方法而言,外周血造血干细胞采集的效率与采前常见血常规指标无显著相关性.     

AutoPBSC程序与MNC程序采集外周血造血干细胞的比较研究

目的比较COBE Spectra血细胞分离系统的自动采集程序(AutoPBSC程序)与4.7版半自动采集程序(MNC程序)采集健康供者外周血造血干细胞的差异及对供者血常规相关指标的影响。方法 2002年3月~2008年3月期间对53例健康供者随机采用Auto PBSC程序和MNC程序进行了113例次造血干细胞采集,其中采用AutoPBSC程序63例次,MNC程序50例次。分析比较2种程序采得外周血造血干细胞(PBSC)的采集体积、单个核细胞百分数及总数、CD34+细胞百分数及总数等指标,采集前后供者红细胞、血小板变化。结果 2种程序采集外周血造血干细胞的体积、单个核细胞百分数、CD34+细胞百分数、CD34+细胞总数、采集袋中血小板及红细胞混入量、采集前后供者血小板计数的变化存在显著性差异(P<0.01);2种程序采集的单个核细胞总数无显著性差异;血小板计数在应用MNC程序组呈下降趋势,较AutoPBSC程序更加明显(P<0.01);1例地中海贫血供者应用Auto PBSC程序采集失败。结论 2种程序均可有效采集外周血造血干细胞,与MNC程序比较AutoPBSC程序具有以下优势:单个核细胞和CD34+细胞百分数提高、采集物体积减少有利于采集物的冻存、采集物中血小板数少对供者血小板影响小。地中海贫血供者需慎用Auto PBSC程序。     

健康供者外周造血干细胞采集的护理

目的 总结健康供者外周造血干细胞采集过程的护理。方法 对健康供者采集外周造血干细胞进行全程护理。结果 22例健康供者均顺利完成外周血造血干细胞采集,不良反应较少,采集物单个核细胞数(MNC)和CD34+细胞数均达到移植要求。结论 正确的护理可以顺利、高质量地完成健康供者外周血造血干细胞的采集。     

Cesarean section due to fetal distress increases the number of stem cells in umbilical cord blood

BACKGROUND: Umbilical cord blood (UCB) can be used as hematopoietic stem cell source for transplantation. The success of a transplantation is highly correlated with the number of total nucleated cells (TNCs) and CD34+ cells in the UCB. Certain obstetric factors increase the yield of stem cells in the UCB. It is necessary to evaluate optimal conditions in labor to decrease the rate of sample rejection due to low cell count. No data exist regarding the difference between primary and secondary Cesarean sections in terms of efficacy of stem cell harvesting. STUDY DESIGN AND METHODS: Seventy-nine consecutive UCB units from women who had a Cesarean section between 1997 and 2003 were included. The number of TNCs, CD34+ cells, colony-forming units (CFUs), white blood cells (WBCs), nucleated red blood cells (NRBCs), and the total collection volume were compared between cases with primary and secondary Cesarean section. RESULTS: UCB obtained after a Cesarean section due to fetal distress has significantly higher numbers of TNCs, CD34+ cells, NRBCs, and WBCs compared to elective Cesarean section. Of the cases with secondary Cesarean section due to fetal distress, 67 percent resulted in UCB units with sufficient TNC numbers (> or =80 x 10(7) TNCs) compared to 42 percent of the cases with primary Cesarean section. CONCLUSION: Fetal distress increases the number of hematopoietic stem cells mobilized into UCB. Particular effort should be made to collect UCB from newborns who experienced fetal distress.     

深低温冻存不同时间对脐血细胞质量的影响

本研究旨在探讨不同冻存时间的脐血干细胞复苏后的回收率,并分析冷冻复苏的细胞对患者植入速度的影响。20份经-196℃液氮低温保存1-10年的脐血干细胞标本,比较冻存前（脐血库提供资料）和复苏后的细胞活率、总有核细胞数（TNC）、CD34＋细胞和粒-巨噬细胞集落形成单位（CFU-GM）的数量,并分析复苏后的细胞回收对移植受者植入速度的影响。结果表明,不同冻存时间对复苏后干细胞的回收率没有影响。经冻存复苏后,细胞活存率为（92．75±2．55）％,TNC、CD34＋细胞数和CFU-GM的回收率分别为89．9％、84．8％和84．3％,与冻存前相比明显减少（P=0．000）,但细胞数量的下降对移植患者中性粒细胞和血小板的植入时间均无影响。冻存后TNC和CD34＋细胞数量与冻存前数量有很大的相关性（r=0．954;r=0．931,P=0．000）,而CFU-GM的相关性弱（r=0．285,P=0．223）。结论：冻存和复温过程会-定程度上损伤脐血干细胞,导致细胞丢失,但不会影响移植的效果。     

Analysis of maternal and neonatal factors that influence the nucleated and CD34+ cell yield for cord blood banking

BACKGROUND: It would be beneficial to be able to predict the cord blood (CB) cell yield from volunteer donors before cell processing. STUDY DESIGN AND METHODS: The maternal and neonatal factors that influence the total nucleated cell (TNC), CD34+ cell, and CFU-GM yields in CB collected for the Chugoku-Shikoku Cord Blood Bank were evaluated. RESULTS: In a univariate analysis, the volume of CB collected was significantly correlated with the TNC, CD34+ cell, and CFU-GM yields (p < 0.001). A longer cord (p < 0.001), larger placenta (p < 0.001), and bigger baby (p < 0.001) were associated with a greater volume of CB. A female baby (p < 0.05) and longer gestational age (p < 0.005) were associated with a higher TNC concentration. A younger maternal age (p < 0.05), larger birth weight (p < 0.001), shorter gestational age (p < 0.001), and shorter time from collection to processing (p < 0.05) were associated with a higher CD34+ cell concentration. A multivariate linear regression analysis was performed to predict the yield and determine first-level selection criteria to start processing when the volume of CB units was on the borderline. However, this formula might not be suitable for actual use. CONCLUSION: Maternal and neonatal factors appeared to affect CB cell yields. These findings might be useful for efficiently collecting more qualified CB units.     

Associations among birth weight, placental weight, gestational period and product quality indicators of umbilical cord blood units

Introduction

Numbers of CD34+ cell and total nucleated cell (TNC) and cord blood volume are commonly used as indicators for haematopoietic potential of umbilical cord blood (UCB) units. The purpose of this study was to investigate the relationship between donor-related factors and the quality indicators of UCB.

Methods

Obstetric and neonatal clinical laboratory data of a total of 1549 UCB units were obtained from Buddhist Tzu Chi Stem Cells Center (BTCSCC) Cord Blood Bank. A retrospective multivariate analysis was conducted to analyze the data.

Results

Our results showed that birth weight had positive correlations with each of the clinical features of CD34+ cell number, TNC count and unit volume of UCB, followed by the placental weight. Longer gestational period would decrease CD34+ cell number and volume of UCB. Female baby and mode of vaginal delivery of neonates were found to have larger amount of TNC in UCB.

Conclusion

Our results would be helpful and beneficial in building up standard criteria for evaluating stored UCB units.     

Dextran sedimentation in a semi-closed system for the clinical banking of umbilical cord blood

BACKGROUND: The results of current processing procedures for reducing volume and recovering HPCs from umbilical cord blood (UCB) before cryopreservation vary. STUDY DESIGN AND METHODS: Dextran was added to bags containing UCB, followed by sedimentation for 30 minutes. The processed UCB was then frozen. RBCs, nucleated cells, MNCs, CD34+ cells, CFUs and long-term culture-initiating cells (LTC-ICs), viability, and sterility were evaluated. Fractionations in ficoll-hypaque and hydroxyethyl starch (HES) were also run in parallel for comparison. RESULTS: The nucleated cell (NC) recovery and RBC depletion were 86.1 percent and 94.3 percent, respectively (n = 50). Sedimentation with dextran also enabled the recovery of 80.7 percent MNCs and 82.6 percent CD34+ cells (n = 30). Postsedimentation samples displayed no impairment of CFU growth (n = 42, 108.7% CFU-C, 104.6% CFU-GEMM, 107% CFU-GM, and 95.7% BFU-E). Long-term cultures on five paired samples before and after sedimentation generated similar numbers of CFU-C each week (p = 0.88). Limiting dilution analysis of 12 paired pre/postsedimentation samples showed comparable median proportions of LTC-ICs (1/6494 vs. 1/5236; p = 0.18). The cell viability of 24 samples of thawed UCB after sedimentation was 90.3 percent (77.5-96%) and the recovery of CFU-C, CFU-GEMM, CFU-GM, and BFU-E of 11 postsedimentation samples was 93.4 percent, 84.9 percent, 92.3 percent, and 83.4 percent, respectively. NC recovery was significantly higher after treatment with dextran than with ficoll-hypaque (n = 30; 88.5% vs. 29.1%; p<0.005) and HES treatment (n = 21; 88.5% vs. 76.4%; p = 0.004). However, MNCs, CD34+ cells, CFUs, LTC-ICs, and RBCs were comparable. Two cycles of dextran sedimentation recovered 93.9 percent of NCs with cell viability of 98.6 percent (96.5-100%), whereas 11.7 percent of RBCs were retained (n = 20). The final yield volume was 33.5 (28-41) mL. CONCLUSION: In a semi-closed system, dextran sedimentation enabled volume reduction of UCB without significant quantitative and qualitative losses of HPCs.     

固定抗凝剂量加入不同量脐血后脐血质量分析评估的研究

目的:研究固定抗凝剂量加入不同量脐血后对脐血质量的影响.方法:对6060份脐血样本,按照抗凝剂/脐血体积比分为28:(10-29)ml组、28:(30-69)ml组、28:(70-109)ml组、28:(110-150)ml组和28:(＞150)ml组.分析各组脐血的冻前有核细胞数、有核细胞活性、CFU-GM数量、CD...     

Factors associated with parameters of engraftment potential of umbilical cord blood

BACKGROUND: Umbilical cord blood (UCB) is an acceptable source of hematopoietic cells for transplantation with success being associated with the nucleated cell count (NCC), CD34+ cells, and colony-forming unit-granulocyte-macrophage (CFU-GM) content infused. A total of 1033 UCB samples with neonatal and paternal characteristics that might influence hematopoietic content were examined. STUDY DESIGN AND METHODS: UCB samples were screened, processed, and reevaluated for the above cell counts. These parameters of engraftment potential were analyzed for associations with neonatal and parental characteristics. RESULTS: Postprocessed NCCs (median, 6.53 x 10(8)+/- 2.80 x 10(8) SD; mean 7.30 x 10(8)), CD34+ counts (median, 2.02 x 10(6) +/- 2.20 x 10(6) SD; mean, 2.65 x 10(6); r = 0.66; p < 0.001), and CFU-GM content (median, 2.65 x 10(5) +/- 3.16 x 10(5) SD; mean, 3.54 x 10(5); r = 0.61; p < 0.001) all were strongly interrelated. Both initial volume (median, 77.5 +/- 26.2 mL SD; mean, 81.9 mL) and initial NCC (median, 9.75 x 10(8) +/- 4.88 x 10(8) SD; mean, 10.9 x 10(8)) correlated well with postprocessed NCC (r = 0.60; r = 0.90; p < 0.01), CD34+ count (r = 0.40; r = 0.63; p < 0.01), and CFU-GM content (r = 0.38; r = 0.59; p < 0.01), with a stronger relationship seen with initial NCC. Infant birth weight (specifically, >3000 g), but not sex, gestational age, or cytomegalovirus status correlated strongly with collection volume and UCB cell counts. Units from minority volunteers contained relatively smaller volumes and hematopoietic content. CONCLUSION: UCB banks should emphasize selecting the heaviest infants and processing large-volume units with high NCCs to optimize hematopoietic potential. Minority recruitment should be encouraged with consideration given to inherent racial differences in cell counts. There does not appear to be a significant relationship between other neonatal and parental characteristics and that of engraftment potential.     

人胎盘组织来源造血干/祖细胞及其特性

背景:近年来的研究表明,除已知的人骨髓、外周血和脐带血中存在造血干/祖细胞外,人胎盘组织中也有造血干/祖细胞存在.目前为止,还缺乏对人胎盘组织造血干/祖细胞的增殖分化特性及人胎盘组织淋巴细胞亚群组成和免疫原性等的深入研究.目的:探究人胎盘组织是否含有比脐带血更丰富的造血干/祖细胞,并对其造血祖细胞系增殖分化能力进行检测,同时对人胎盘组织淋巴细胞亚群组成及表型特征进行分析.设计、时间及地点:开放性实验,于2004-01/2006-12在贵州省细胞工程重点实验室完成.材料:经产妇知情同意,无菌采集遵义医学院附属医院产科健康足月分娩新生儿胎盘和脐带血共12份.淋巴细胞亚群检测试剂盒,CD34绝对计数试剂盒(Becton Dickinson公司):CD34磁珠分选试剂盒,FITC标记的CD38单克隆抗体,抗FITC磁珠和MS/LS免疫磁式细胞分选柱(Miltenyi Biotec).方法:脐带血与RPMI-1640培养基(含体积分数为0.1的胎牛血清)按1:1的比例混合,采用Ficoll-Histopaque分离液离心30min,吸取界面层细胞,PBS洗涤一次,获得脐带血单个核细胞.采用机械法加0.25g/L胶原酶消化制备胎盘组织单个细胞悬液,之后同脐带血单个核细胞分离步骤分离胎盘单个核细胞.流式细胞仪检测胎盘单个核细胞中CD34 CD38-, CD34 CD38 造血干/祖细胞(HSPCs)和淋巴细胞亚群的组成比例.免疫磁珠分选法分选人胎盘CD34 CD38-,CD34 D38 造血干/祖细胞,并分别进行粒细胞-单核细胞集落生成单位、红细胞爆裂型集落生成单位、混合集落生成单位系集落形成培养,以评价其造血祖细胞系增殖分化能力.实验全程用脐带血作平行比较分析.主要观察指标:胎盘和脐带血CD34 造血干/祖细胞组成百分率、祖细胞系集落形成能力、淋巴细胞亚群表型及组成特点.结果:[1]胎盘CD34 造血干/祖细胞百分率是脐带血的8.8倍,差异有显著性意义(P<0.01).[2]胎盘中的淋巴细胞总数、T细胞(CD3 CD2 )、B细胞(CD19 )、Th(CD3 CD4 )细胞及Th/Ts比值均明显低于脐带血,而CD8 CD28-T抑制细胞则明显高于脐带血,差异有显著性意义(P<0.01).[3]胎盘CD34 CD38 造血干/祖细胞亚群培养形成的粒细胞-单核细胞集落生成单位、红细胞爆裂型集落生成单位、混合集落生成单位集落数明显高于CD34 CD38-造血干/祖细胞亚群(P<0.01);胎盘与脐带血造血干/祖细胞中相同表型细胞亚群形成的各系集落数比较,差异无显著性意义(P0.05).结论:人胎盘组织富含CD34 造血干/祖细胞,其CD34 CD38 、CD34 CD38-两个造血干/祖细胞亚群均具有增殖分化为粒细胞-单核细胞集落生成单位、红细胞爆裂型集落生成单位、混合集落生成单位的能力,并且人胎盘组织具有淋巴细胞亚群低比例和抑制性T细胞高比例的特点,使其有望成为造血干/祖细胞移植的新来源.     

气相液氮罐内温度差异对脐带血造血干细胞保存质量的影响

目的 研究气相液氮罐内因位置不同而导致的温度差异对脐带血造血干细胞保存质量的影响.方法 选取位于液氮中的脐血干细胞20份作为对照组A组,保存在气相液氮罐内最低温度保存处的20份样本为实验B组,最高温度保存处的20组样品为实验C组.各组细胞解冻复苏后进行有核细胞计数、有核细胞活性、CD34+％、CFU-GM等检测,进行单...