人脐血及骨髓淋巴细胞免疫表型的比较及其意义

人脐血及骨髓淋巴细胞免疫表型的比较及其意义

郭　荣,邹　萍,邹典斌1

(华中科技大学同济医学院附属协和医院血液病研究所,武汉430022;

1郑州大学医学院第一附属医院血液科,郑州450052)

摘要 为比较脐血和骨髓淋巴细胞及祖细胞分化抗原,通过流式细胞术(FCM)双标法对38份脐血及10份骨髓免疫细胞表型进行了分析研究。研究发现:①脐血及骨髓淋巴细胞中均测到幼稚淋巴细胞(CD3-CD4+),且前者中含量较多,但脐血细胞毒T细胞含量(CTL,CD3+CD16+56+)低于骨髓;②脐血中N K细胞(CD3-CD16+56+)比例高于骨髓;③脐血有核细胞中CD34+细胞的比值接近于骨髓,但脐血CD34+细胞中髓系祖细胞(CD34+ CD13+,CD34+HLA2DR+)及淋巴系祖细胞(CD34+CD19+)含量均低于骨髓。结论:①脐血免疫细胞具有不成熟性,这估计是脐血移植后GVHD程度轻的主要原因;②脐血淋巴细胞中N K细胞含量较高,推测脐血移植后移植物抗白血病效应(GVL)并不会降低;③脐血CD34+细胞中髓系祖细胞及淋巴系祖细胞比例均低于骨髓,可能是脐血移植后造血及免疫重建速度较慢的原因之一。

关键词 脐血;骨髓;淋巴细胞;免疫表型

中图分类号 R33111;R331.2

A Comparison bet w een Immunophenotypes of Lymphoid Cells from H uman Umbilical Cord Blood and Bone Marrow and Its Signif icance

GUO Rong,ZOU Ping,ZOU Dian2Bin1

(Instit ute of Hematology,The A f f iliated U nion Hospital,Tongji Medical College,Huaz hong Science and Technology U niversity, W uhan430022,Chi na;1Depart ment of Hematology,The Fi rst A f f iliated Hospital of Medical College of Zhenz hou U niversity, Zhenz hou450052,Chi na)

Abstract To compare the expression of CD antigens on immune cells from umbilical cord blood(UCB)and bone marrow(BM)and analyze its clinical significance,the phenotypes of lymphoid cells and nucleated cells from38UCB and 10BM samples were investigated by flow cytometry with double labeling monoclonal antibodies.The results showed that the immature lymphocytes(CD3-CD4+)were detedcted in UCB and higher than those in BM;cytotoxic T lymphocytes (CD3+CD16+CD56+)in UCB were significantly lower than those in BM.N K cells(CD3-CD16+CD56+)in UCB were higher than those in BM.The ratio of CD34+cells in nucleated cells of UCB was similar to that of BM,however,both the contents of myeloid(CD34+CD13+and CD34+HLA2DR+)and lymphoid(CD34+CD19+)progenitor cells in UCB were lower than those in BM.It is concluded that the immune cells in UCBpossess immaturity,which might lead to mild GVHD after UCB trans plantation.It is infered from the higher ratio of N K cells in UCB,GVL will not decrease after UCB transplantation.The lower contents of myeloid and lymphoid progenitor cells in UCB probably accounted for the slow hematopoiesis and immune reconstitution following UCB transplantation.

K ey w ords umbilical cord blood;bone marrow;lymphoid cell;immunophenotype

脐血具有经济、来源广、采集方便、无采集并发症,移植后移植物抗宿主病(graft versus host dis2 ease,GV HD)程度轻,移植物抗白血病(graft versus leukemia,GVL)效应不降低等优点。但是脐血也存在造血重建速度慢,易合并感染的问题。本研究应用流式细胞术(flow cytometry,FCM)对脐血和骨髓免疫细胞分化抗原进行检测,比较二者在淋系祖细胞、髓系祖细胞、幼稚淋巴细胞及N K细胞含量方面有无差别,旨在分析二者免疫表型差异,探讨其在扩大脐血应用范围中的作用和意义。

材料与方法

标本采集

无菌条件下采集正常足月分娩新生儿脐血38份。母亲年龄24-35岁,平均(29.3±3.3)岁。新生儿娩出后,立即(不超过30秒)用止血钳在距脐轮2-3cm处夹住脐带,在两钳间剪断脐带,用含少许肝素的注射器抽取脐血,加入离心管中混匀。骨髓

　通讯作者:郭荣　电话:(027)85730575.E2mail:gh7311@yahoo.

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中国实验血液学杂志　Journal of Ex perimental Hem atology2002;10(6):519-522