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细胞因子体外扩增脐血CD+34细胞移植SCID鼠人类免疫功能的建立
http://www.100md.com 《临床血液学杂志》 2000年第1期
     作者:仇志根 范华骅 高峰

    单位:仇志根(上海市血液中心输血研究所(上海市,200051));范华骅(上海市血液中心输血研究所(上海市,200051));高峰(上海市血液中心输血研究所(上海市,200051))

    关键词:脐血;体外扩增;移植;SCID鼠

    临床血液学杂志000105 摘要:目的:探讨扩增的脐血CD34细胞体内造血功能。方法:FLT3配体联合血小板生成素体外培养脐血CD+34细胞2~3周后移植SCID鼠,采用FCM检测SCID鼠骨髓、外周血、脾脏中的人类CD45、CD3、CD19抗原。结果:脐血CD+34细胞扩增10~37倍,移植6.6×104~6.9×105脐血CD+34细胞于SCID鼠,6周后10只SCID鼠骨髓中均检测到人类CD45抗原(0.2%~4.0%),6只SCID鼠外周血、脾脏中检测到人类CD3抗原(0.1%~2.3%),3只SCID鼠中外周血、脾脏中检测到人类CD19抗原(0.3%~1.3%)。结论:FLT3配体联合血小板生成素体外扩增的脐血CD+34细胞能重建SCID鼠人类免疫功能。
, 百拇医药
    Engraftment of severe combined immunodeficient mice transplanted with ex vivo-expanded human CD+34 cord blood cells

    QIU Zhi-gen FANG Hua-hua GAO Feng

    (Shanghai Institute of Blood Transfusion of Shanghai Blood Center,200051)

    Abstract:Objective:To explore the hematopoietic function of cytokine-expanding CD+34 cells from umbilical cord blood in vitro.Method:Cord blood cells expanded with FLT3(FMS-like tyrosine kinase 3)-ligand and thrombopoietin were transplanted in SCID(severe combined immune-deficient)mice. Human mature cell surface markers were detected with flow cytometry and used as indicator of succeeding transplantation.Result:After 2 and 3 weeks culture,the number of CD+34 cells increased approximately 10 and 37 folds. After transplantation with 6.6×104 to 6.9×105 CD+34 cells,respectively the percentage of human CD+45 cells in the bone marrow of all 10 SCID mice is 0.2%~4.0%. The percentage of human CD+3 cells in the peripheral blood and spleen of 6 SCID mice is 0.1%~2.3%. The percentage of human CD+19 cells in the peripheral blood and spleen of 3 SCID mice are 0.3%~1.3%.Conclusion:CD+34 cells expanded with FLT3-ligand and thrombopoietin are potential engraft used for reconstitution of both hematopoietic and immunologic function of SCID mice.
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    Key words:Umbilical cord blood Expanion in vitro Transplantation SCID mice▲

    脐血中含有丰富的造血干细胞。脐血移植已成功地应用于临床治疗白血病等病人。由于脐血量较少,造血干细胞绝对数少,成人移植成功的机会较儿童低,移植后中性粒细胞的恢复较慢〔1〕。因此,脐血造血干细胞的体外扩增已成为研究热点。近年来,国外许多学者采用FLT3配体(FL),血小板生成素(TPO),干细胞生长因子(SCF)等体外培养脐血CD+34细胞,结果使CD+34细胞得到了不同程度的扩增〔2,3〕。本课题采用SCID鼠作模型,探讨扩增的脐血CD+34的体内造血功能。

    1 材料与方法
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    1.1 细胞和动物来源

    无菌采集正常足月新生儿脐血,肝素抗凝,Ficoll-Hypaque分离单核细胞,洗涤备用。SCID鼠来自中国科学院上海药物研究所,鼠龄6周,雌性,饲养于无菌层流室内,饲料、饮水及垫料均经高压灭菌。

    1.2 CD+34细胞分离纯化

    利用吸附单克隆抗体——磁珠分离系统(MACS,德国Miltenyi Biotec Inc产品)。抗CD34抗体为QBENO-10,磁珠为羊抗鼠IgG1免疫磁珠,标记细胞通过置于磁场中的分离柱,洗涤去除CD-34细胞,将分离柱移出磁场,加压洗脱,收集CD+34细胞,流式细胞仪(COULTER EPICS ELITE ESP)检测CD+34细胞。
, 百拇医药
    1.3 CD+34细胞体外培养

    IMDM培养基中含有10%新生牛血清(杭州四季青生物工程材料研究所产品),rhu TPO 4万U/L(Stem Cell产品),rhu FL 100 μg/L(Stem Cell产品),接种细胞浓度为5×107/L,置37℃ CO2孵箱中培养,每周半量换液2次,取非粘附细胞计数。FCM检测细胞表面标记。

    1.4 移植

    取SCID鼠10只,经尾静脉注入0.1 ml扩增的脐血CD34细胞,观察6周,7周,8周,9周,10周后处死,取骨髓、外周血、脾脏(经压片后用Ficoll-Hypaque分离成单核细胞),FCM检测CD45,CD3,CD19
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    1.5 细胞表面标志的流式细胞仪分析

    结合有PE或FITC的鼠抗人单克隆抗体CD34,CD45,CD3,CD19,CD4/CD8(均为IgG1,Immunotech产品),标记方法按产品说明书,FCM检测。

    2 结果

    2.1 输入扩增的造血干细胞数量

    2份脐血经MACS分离纯化后,CD+34细胞纯度分别为78.1%和74.0%,FL联合TPO体外无基质培养2周和3周,非粘附细胞扩增44倍和256倍,CD+34细胞扩增11倍和37倍,CD+34CD-38细胞扩增7.5倍和34倍,CD+34细胞占非粘附细胞中的比例分别为19.6%和10.7%,CD+34CD-38细胞占非粘附细胞中的比例分别为13.4%和10.1%。移植SCID鼠CD+34细胞量见表1。
, 百拇医药
    表1 移植SCID鼠的脐血CD+34细胞数量 脐血

    CD+34细胞

    扩增倍数

    CD+34

    细胞

    CD+34

    CD-38

    非粘附

    细胞数

    1
, 百拇医药
    11

    6.9×105

    4.8×105

    3.5×106

    2

    37

    6.6×104

    6×104

    6×105

    2.2 CD+34细胞的植入
, 百拇医药
    移植10只SCID鼠6,7,8,9,10周后,在每只SCID鼠骨髓、外周血、脾脏中均可检测到人类CD45细胞,说明扩增的脐血CD+34细胞已在SCID鼠中植活。见表2。表2 不同移植时间SCID鼠骨髓、外周血、脾脏中人类CD45抗原的检测结果 周次

    编号

    骨髓

    外周血

    脾脏

    周次

    编号

    骨髓

    外周血
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    脾脏

    6

    1

    2

    0.2

    2.0

    ND1)

    0.1

    ND

    1.4

    9

    1

    2
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    0.3

    0.8

    0

    ND

    0.2

    0.3

    7

    1

    2

    3.3

    1.1

    ND

    1.7

    ND
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    2.5

    10

    1

    2

    4.0

    0.8

    2.2

    ND

    0.7

    1.4

    8

    1

    2

    0.9
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    0.2

    ND

    1.2

    ND

    0

    1)ND未测

    2.3 移植后SCID鼠中人类免疫功能的建立

    移植10只SCID鼠中,5只SCID鼠外周血、脾脏中检测到人类T细胞CD3抗原(0.1%~2.3%),3只SCID鼠外周血、脾脏中检测到人类B细胞CD19抗原(0.3%~1.3%),说明扩增的脐血造血干细胞已在SCID鼠中建立了人类免疫系统。

    3 讨论
, 百拇医药
    SCID鼠是C、B-17纯系小鼠16号染色体上的SCID基因突变引起的T、B细胞功能联合缺陷,但骨髓造血微环境和胸腺基质完整无损,故该鼠可接受人造血细胞和淋巴组织植入并生长〔4,5〕。国外学者报道,每只SCID鼠移植的CD+34细胞数量为2.74×104~5×105〔6〕,本实验采用扩增的脐血CD+34细胞数量为6×104~6.6×105,移植未经照射的SCID鼠,FCM检测到人类CD45,CD3,CD19抗原,说明SCID鼠植入了扩增的人脐血CD+34细胞。■

    参考文献:

    [1]Rubinstein P,Carrier L, Scarcdauou A, et al. Outcomes among 562 recipients of placental-blood transplants from unrelated donors. N Eng J Med,1998,339:1565~1577
, 百拇医药
    [2]Koller M R, Manchel I, Maher R J,et al. Clinical-scale human umbilical cord blood cell expansion in a novel automated perfusion culture system. Bone Marrow Transplantation,1998,21:653~663

    [3]Almici C, Carlo-Stella C, Wagner J E, et al. Clonogenic capacity ex vivo expansion potential of umbilical cord blood progenitor cells are not impaired by cryopreservation. Bone Marrow Transplantation,1997,19:1079~1084

    [4]Bosma G C, Davisson M T, Ruetsch N R, et al. The mouse mutation severe combined immunodeficiency(scid) is a chromosome 16. Immunogenetics,1989,29:54~57
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    [5]Fulop G M,Philips R A. The scid mutation in mice cause general defect in DNA repair. Nature,1990,47:479~482

    [6]Hogan C J, Shpall E J, McNulty O, et al. Engraftment and development of human CD+34-enriched cells from umbilical cord blood in NOD/Ltszscid/scid mice. Blood,1997,90:85~96

    收稿 1999-04-15

    修回 1999-08-09, http://www.100md.com