Local and systemic inflammation triggers different outcomes of tumor growth related to infiltration of anti-tumor or pro-tumor macrophages. Issue 15 (5th August 2022)

• Record Type: Journal Article
• Authors: Liu, Xinghan; Jiang, Qi; Shen, Sunan; Hou, Yayi
• Editors: Wei, Peifang
• Is Part Of: Chinese medical journal. Volume 135:Issue 15(2022)
• Page Start: 1821
• Page End: 1828
• Publication Date: 2022-08-05
• Subjects: Inflammation -- Cancer -- Macrophage -- Toll-like receptor; Medicine -- Periodicals; Medicine, Oriental -- Periodicals; Medicine; Medicine, Oriental; Medicine; Medicine, East Asian Traditional; Periodicals; Electronic journals; 610.5
• DOI: 10.1097/CM9.0000000000001775
• Languages: English
• ISSNs: 0366-6999

Abstract

Abstract: Background: Previous evidence suggests inflammation may be a double-edged sword with cancer-promoting and cancer suppressing function. In this study, we explore the impact of local and systemic inflammation on cancer growth. Methods: Female BALB/C mice were subcutaneously implanted with foreign body (plastic plates) to build up a local inflammation and intraperitoneally injected with PolyIC or lipopolysaccharides (LPS) to build up a systemic inflammation, followed by subcutaneous injection of 5 × 10 5 colon cancer cells. Immunohistochemistry and enzyme linked immunosorbent assay were utilized to detect the Ki67 and interleukin (IL) 6, IL-1β, and monocyte chemoattractant protein-1 expression in the tumor tissues and serum, respectively. The distributions of immune cells and expression of toll-like receptors (TLRs) were evaluated by flow cytometry (FCM) and quantitative real time-polymerase chain reaction. Results: The results showed that local inflammation induced by foreign body implantation suppressed tumor growth with decreased tumor weight ( P = 0.001), volume ( P = 0.004) and Ki67 index ( P < 0.001). Compared with the control group, myeloid-derived suppressive cells sharply decreased ( P = 0.040), while CD4 + T cells slightly increased in the tumor tissues of the group of foreign body-induced local inflammation ( P = 0.035). Moreover, the number of M1 macrophages ( P = 0.040) and expression of TLRs, especially TLR3 ( P < 0.001) and TLR4 ( P < 0.001), were significantly up-regulated in the foreign body group. Contrarily, tumor growth was significantly promoted in LPS or PolyIC-induced systemic inflammation ( P = 0.009 and 0.006). FCM results showed M1 type macrophages ( P = 0.017 and 0.006) and CD8 + T cells ( P = 0.031 and 0.023) were decreased, while M2 type macrophages ( P = 0.002 and 0.007) were significantly increased in tumor microenvironment of LPS or PolyIC-induced systemic inflammation group. In addition, the decreased expression of TLRs was detected in LPS or PolyIC group. Conclusions: The foreign body-induced local inflammation inhibited tumor growth, while LPS or PolyIC- induced systemic inflammation promoted tumor growth. The results suggested that the different outcomes of tumor growth might be attributed to the infiltration of anti-tumor or pro-tumor immune cells, especially M1 or M2 type macrophages into tumor microenvironment.