IFN-α对体外培养CML-DC功能、表达趋化因子及其受体的影响

Influence of IFN-α on Function of CML-DC in vitro and Expression of Chemokine with Its Receptor

为了研究α干扰素(IFN-α)对慢性粒细胞白血病(CML)来源的树突状细胞(DC)分泌趋化因子、表达趋化因子受体及其功能的影响,取13例CML慢性期患者骨髓单个核细胞,在小牛血清培养体系中诱导培养CML来源的DC,以rhSCF、rhFlt3L作为扩增体系的细胞因子,加入rhGMCSF、rhTNFα、rhIL4,加或不加rhIFN-α诱导DC的生成,培养2周后流式细胞术检测培养细胞的免疫表型,ELISA法检测培养上清液中CMLDC分泌MIP3-β的含量,MTT法检测CMLDC刺激健康人外周血T淋巴细胞增殖能力。结果表明:IFN-α组培养所获DC表面CD86、CD83、CD40、MHCⅠ类分子、CCR7的表达均高于对照组(P<0.01);IFN-α组诱导培养的CMLDC表达MIP3β较对照组明显增高(P<0.01);IFN-α组诱导培养的CMLDC刺激异体T淋巴细胞增殖的能力较对照组明显增强(P<0.01)。结论:IFN-α可能部分通过纠正CMLDC的免疫表型以加速CMLDC的成熟,增强CMLDC的功能。

To study the influence of IFN-α on function of CML-DC cultured in vitro and expression of chemokine and its chemokine receptor, bone marrow mononuclear cells from 13 CML patients were cultured in the fetal calf serum culture system supplemented with rhSCF, rhFlt-3L for expansion system, and adding rhGM-CSF, rhTNF-α, rhIL-4, with or without rhIFN-α to induce DCs. After incubation for two weeks, the phenotypes of CML-DC were analyzed by direct immunofluorescence and flow cytometry. The concentration of MIP-3β expressed by CML-DC in the supernatant were analyzed by ELISA. The proliferative ability of T cells from healthy volunteers stimulated by CML-DCs were measured by MTT assay. The results showed that expression of CD86, CD83, CD40, MHC-I class molecules, CCR7, the concentration of MIP-3β expressed by CML-DC, and the proliferative ability of T cells stimulated by CML-DCs in IFN-α group were all significantly higher than that in control group (P<0.01). It is concluded that the immunophenotype of CML-DCs can be partially changed by IFN-α to accelerate the maturation of CML-DCs, enhance the capacity of CML-DCs, and stimulate allogeneic T lymphocyte proliferation.