巨噬细胞在溃疡性结肠炎癌变中的作用

溃疡性结肠炎是病因不明的肠道非特异性炎症,其癌变风险呈逐年上升的趋势。巨噬细胞是机体免疫系统的重要组成,在炎症时发挥积极的免疫作用;但在肿瘤微环境中出现表型及功能的改变,其释放的大量细胞因子作用于结肠癌细胞,能促进结肠癌细胞增殖、抑制其凋亡、促进血管生成等。受肿瘤影响的巨噬细胞,还通过与其他炎症细胞相互作用,改变机体的免疫功能,形成免疫抑制。故巨噬细胞的改变与溃疡性结肠炎癌变的过程密不可分。

Effect of macrophages on ulcerative colitis-associated carcinogenesis

Ulcerative colitis is a non-specific colorectal inflammation of unknown causes. It is now known to complicate the dangers of colorectal cancer more than was previously thought. Macrophages are an important part of immune system and play a positive role in immune reaction. But it has been shown that the phenotype and the function of macrophages change in the tumor microenvironment. Through their interaction with colorectal cancer cells and by releasing large quantities of cytokines, macrophages promote colorectal cancer cells by inhibiting angiogenesis and inhibit apoptosis. But the macrophages are also affected by cancer, interact with other inflammatory cells, and become immune suppressed. Thus the changes of macrophages are inseparable with colitis-associated colorectal carcinogenesis.