慢性髓系白血病来源的树突状细胞生物学特性的研究

目的:体外诱导慢性髓系白血病(CML)原代细胞分化生成树突状细胞(Dendritic cells DCs),并研究其生物学特性和功能.方法: 分离初诊13例CML患者的骨髓单个核细胞和5例正常人外周血的单个核细胞,用rhGM -CSF 1 000 U/ml、rhIL-4 500 U/ml和TNF-α50 U/ml联合培养10 d;形态学(Wright染色、倒置显微镜、透射电镜),免疫学(CD80、CD86、CD83、CD 1a、HLA-DR)鉴定,荧光原位杂交(FISH)进行细胞遗传学分析,ELISA检测分泌IL- 12的能力和混合淋巴细胞反应(MLR)检测抗原递呈功能.结果:慢性白血病细胞体外诱导后,大部分细胞呈现树突状细胞的典型形态,而且有免疫标记的明显上调(CD 86 24.49±25.87 vs 61.73±28.54;CD1a 10.41±9.52 vs 47.26±3 5.60,P<0.05);FISH证实这类DC还携带有白血病克隆,并且具有分泌IL-12和刺激T淋巴细胞增殖的能力.结论:在体外可成功地将CML细胞诱导分化成树突状细胞 ,这类DC与正常DC无论在形态学和免疫学表达方面均相似,但是功能较弱.

Biological features of dendritic cells derived from chronic myeloid leukemia cells in vitro

OBJECTIVE: To induce primary chronic myeloid leukemia (CML) cells into dendritic cells (DCs). METHODS: Bone marrow mononuclear cells (MNCs) were isolated from 13 CML patients and peripheral blood MNCs from 5 healthy donors. The isolated MNCs were co-cultured with rhGM-CSF 1,000 U/ml, rhIL- 4,500 U/ml and TNF-alpha 50 U/ml for 10 days. The morphological features were observed by Wright's staining,inverted microscope and electron microscope. CD(80), CD(86), CD(83), CD(1a) and HLA-DR expression were assayed by flow cytometry, cytogenetic analysis was performed by fluorescence in-situ hybridization(FISH). The concentration of IL-12 was measured by ELISA and the function of antigen presenting was tested by mixed lymphocyte reaction (MLR). RESULT: After being cultured with cytokines, the typical dendritic appearance with delicate membrane projections was observed. The CD(80), CD(86), CD(83), CD(1a) and HLA-DR markers and capacity of stimulating allogeneic T cells were upregulated significantly. FISH confirmed that the DCs were generated from leukemic origin and CML DCs could secrete higher level of IL-12 than CML MNCs. There were no differences in morphology and immunophenotype expression between DCs derived from CML and those from normal individuals. However, DCs from CML patients displayed weaker activity than that of normal individuals when tested in MLR. CONCLUSION: CML cells could be induced into leukemia-DCs by co-culture with cytokines.