目的:初步探讨重组人白介素-27(interleukin-27,IL-27)体外对人外周血来源的细胞因子诱导的杀伤(cytokineinducedkiller,CIK)细胞增殖及其对肿瘤细胞的杀伤能力的影响。方法:无菌条件下分离健康志愿者外周血单个核细胞(peripheralbloodmononuclearcell,PBMC),第0天加入IFN-γ、CD3单抗,之后根据加入不同细胞因子剂量随机分为六组进行CIK细胞培养:A组(IL-2:1000U/ml,正常对照组),B组(IL-2:1000u/ml,IL-27:20ng/m1),C组(IL-2:1000U/ml,IL-27:10ng/m1),D组(IL-2:500U/ml,IL-27:10ng/ml),E组(IL-2:1000U/ml,IL-27:5ng/ml),F组(IL-2:1000U/ml,IL-27:40ng/ml)。倒置相差显微镜下观察各组CIK细胞生长情况,流式细胞术检测各组C1K细胞CD3+ CD56+T、CD8+T细胞的表达,自动细胞计数仪计数各组CIK细胞增殖情况,MTS方法测定各组CIK细胞对淋巴瘤K562细胞的杀伤活性。结果:培养第11天,D组与A、B、C组比较,CIK细胞中CD3+ CD56+ T细胞的表达[(66.57±2.44)%掷(60.03±1.75)%,(55.51±0.03)%,(56.07±0.83)%;均P〈0.05]、CD8+T细胞的表达[(81.67±1.97)%郴(70.30±2.67)%,(74.92±2.47)%,(74.43±1.90)%;均P〈0.05]都明显增强;D组CIK细胞培养的扩增倍数明显高于A、B、C组[(4811.87±23.07)vs(3257.73±91.97),(3790.92±64.49),(4009.85±43.08)倍;均P〈0.05];效靶比40:1时;D组CIK细胞培养第11天时杀伤力为(76.71±2.21)%,显著高于其他各组(均P〈0.05)。结论:细胞因子IL-27体外可显著提高CIK细胞的增殖能力和杀伤能力,最佳培养周期为11d。
Objective:To investigate the effect of IL-27 on the proliferation and cytotoxicity of cytokine induced killer (CIK) cells derived from human peripheral blood mononuclear cells (PBMC). Methods: Monocytes were purified from PBMCs obtained from healthy adults. After being challenged with interferon-γ (IFN-γ) and anti-human CD3, the cells were radomly divided into six groups by different stimulating factors: A group (IL-2:1 000 U/ml), B group (IL-2: 1 000 U/ml, IL-27:20 ng/ml), C group (IL-2:1 000 U/ml, IL-27:10 ng/ml), D group (IL-2:500 U/ml, IL-27: 10 ng/ml), E group (IL-2:1 000 U/ml, IL-27:5 ng/ml), and F group (IL-2:1000 U/ml, IL-27:40 ng/ml). The mor- phology of the CIK cells in different groups were evaluated by inverted microscopy. The proportion of CIK cells respective- ly expressing CD3 + CD56 + and CD8 + were analyzed by fluorescence activating cell sorter (FACS) on days 7 , 9, 11 and 13 after treatments. The number of attached cells was counted by a computer-based cell counter. The cytotoxicity of CIKceils was determined by MTS test. Results: Compared with A, B and C groups, D group had significantly higher propor- tions of CD3 +CD56+ CIK cells ([66.57 ±2.441% vs [60.03 ±1.751%, [55.51 ±0.031%, and [56.07 ± 0.831%; P〈0.05) and CD8 + CIK cells ([81.67 ±1.971% vs [70.30±2.671%, [74.92 ±2.471%, and [ 74.43 ± 1.90 ] % ; P 〈 0.05 ), and significantly higher index of cell expansion to culture median (4 811.87 ± 23.07 vs 3 257.73 ± 91.97, 3 790.92 ± 64.49, 4 009.85 ± 43.08 ; P 〈 0.05) on day 11 after treatments. The highest effector to target cell ratio on day 11 in D group was 40:1 with a cytotoxicity rate of (76.71 ± 2. 21 )% which was significantly higher than that in groups A, B, and C. Conclusion: In vitro, IL-27 is capable of significantly enhancing the proliferation and cytotoxicity of CIK cells in a time-dependent manner and the optimal time of incubation seems to be 11 days.