Effect of bifunctional IL2- GMCSF in promoting dendritic cell activation in vitro in simulated tumor-induced immune suppression
- VernacularTitle:双功能分子白介素-2-粒细胞-巨噬细胞集落生长因子促进树突状细胞在肿瘤免疫抑制环境中的活化效应
- Author:
Qian WEN
1
;
Wenjing XIONG
;
Sudong LIU
;
Chaoying ZHOU
;
Li MA
Author Information
1. 南方医科大学生物技术学院分子免疫学研究所
- Keywords:
bifunctional molecular;
interleukin 2;
granulocyte macrophage colony stimulating factor;
dendritic cells;
tumor immune inhibition
- From:
Journal of Southern Medical University
2015;(9):1239-1244
- CountryChina
- Language:Chinese
-
Abstract:
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.
