摘要
目的将本室构建与制备的双功能分子白介素-2-粒细胞-巨噬细胞集落生长因子(IL2-GMCSF)蛋白作用于肿瘤条件培养基(TCM)环境中的树突状细胞系(DC),检测其对DC细胞的活化,探讨其用于活化DC、进行抗肿瘤免疫治疗的可能性。方法制备小鼠黑色素瘤B16F10细胞系的TCM,用以培养DC2.4细胞,同时分别添加IL2-GMCSF、GM-CSF、IL-2、或IL-2与GMCSF组合使用。24 h后,检测DC2.4细胞的吞噬与增殖活性、细胞成熟表型、细胞因子分泌与信号通路活化。结果 DC2.4细胞具有未成熟DC的特征,在TCM培养条件下吞噬能力增强、但增殖活性显著受抑,TCM对DC成熟表型表面标志的表达有一定促进作用,并促进单核与DC来源的趋化因子(MDC),但抑制DC的IL-12分泌。与之相反,IL2-GMCSF主要借助其GM-CSF活性,促进DC2.4细胞的吞噬与增殖活性,并促进DC进一步成熟,且高表达IL-12与MDC。与GM-CSF相比,IL2-GMCSF可诱导更高的炎性NF-κB通路活化水平,而抑制调节性STAT3通路的活化。结论与GM-CSF单独作用相比,IL2-GMCSF可更好地促进肿瘤免疫抑制环境中的DC活化,有望成为有效的临床抗肿瘤治疗手段。
Objective To test the effect of bifunctional molecule IL2-GMCSF in promoting the activation of dendritic cells(DCs)cultured in tumor conditioned medium. Methods We prepared a tumor conditioned medium using mouse melanoma cell line B16F10 supplemented with IL2-GMCSF, GM-CSF, IL-2, or the combination of the latter two. After culturing mouse DC cell line DC2.4 in the conditioned medium for 24 h, the DCs were examined for phagocytosis, proliferation, maturation phenotype,cytokine secretion, and signal pathway activation. Results DC2.4 cells displayed characteristics of immature DCs. After cell culture in the conditioned medium, the cells showed enhanced phagocytosis but significantly suppressed cell proliferation activity. Culture in the conditioned medium also promoted DC cell maturation and secretion of macrophage- derived chemokine(MDC), but inhibited IL- 12 secretion. Supplementation of the conditioned medium with IL2- GMCSF promoted phagocytosis, proliferation, maturation, and cytokine(including both IL-12 and MDC) secretion of DC2.4 cells. Compared with GM-CSF, IL2-GMCSF induced a higher level of NF-κB signal pathway activation but suppressed STAT3 activation. Conclusion Compared with GM-CSF, IL2-GMCSF can better promote DC activation in the context of tumor-induced immune suppression,and thus shows potentials in anti-tumor therapy.
出处
《南方医科大学学报》
CAS
CSCD
北大核心
2015年第9期1239-1244,共6页
Journal of Southern Medical University
基金
国家自然科学基金(81371764
81171539)
广东省自然科学基金(2014A030313322)
广东省科技计划(2013B010404020)~~