Enhancement of phagocytosis and cytotoxicity in macrophages by tumor-derived IL-18 stimulation.

Enhancement of phagocytosis and cytotoxicity in macrophages by tumor-derived IL-18 stimulation.
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DOI:
10.5483/bmbrep.2014.47.5.152
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发表时间:
2014-05
期刊:
影响因子:
3.8
通讯作者:
Sugimoto K
Sugimoto K
中科院分区:
生物学3区
文献类型:
--
作者:
Henan X;Toyota N;Yanjiang X;Fujita Y;Zhijun H;Touma M;Qiong W;Sugimoto K

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Inoculation of mice with the murine NFSA cell line caused the formation of large tumors with necrotic tumor cores. FACS analysis revealed accumulations of CD11b+ cells in the tumors. Microarray analysis indicated that the NFSA cells expressed a high level of the pro-inflammatory factor interleukin-18 (il-18), which is known to play a critical role in macrophages. However, little is known about the physiological function of IL-18-stimulated macrophages. Here, we provide direct evidence that IL-18 enhances the phagocytosis of RAW264 cells and peritoneal macrophages, accompanied by the increased expression of tumor necrosis factor (tnf-α), interleukin-6 (il-6) and inducible nitric oxide synthase (Nos2). IL-18-stimulated RAW264 cells showed an enhanced cytotoxicity to endothelial F-2 cells via direct cell-to-cell interaction and the secretion of soluble mediators. Taken together, our results demonstrate that tumor-derived IL-18 plays an important role in the phagocytosis of macrophages and that IL-18-stimulated macrophages may damage tumor endothelial cells. [BMB Reports 2014; 47(5): 286-291]
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