基质金属蛋白酶_0.docx
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基质金属蛋白酶【关键词】 肠肿瘤;基质金属蛋白酶;肿瘤坏死因子受体 Effects of matrix metalloproteinase9 on the expression of tumor necrosis factor receptor1 in human colon carcinoma cell lines 【Abstract】 AIM: To study the effects of matrix metalloproteinase9 (MMP9) on the expression of tumor necrosis factor receptor1 (TNFR1) and migratory and invasive potentials in human colon carcinoma cells. METHODS: Immunofluorescence staining was applied to examine the expression of TNFR1 in SW1116 in human colon carcinoma cell lines. The expression of TNFR1 was assayed by flow cytometry in human colon carcinoma SW1116 cells treated with MMP9 at different concentrations and at different time periods of culture. RESULTS: TNFR1 was expressed in SW1116 cells and MMP9 downregulated the expression of TNFR1 on cell surface in a dose and timedependent manner. CONCLUSION: MMP9 decreases the expression of TNFR1 on the surface of human colon carcinoma cells, which may be a factor associated with invasive and metastasis potentials of colon carcinoma. 【Keywords】 intestinal neoplasms; matrix metalloproteinase; TNFR 【摘要】 目的: 研究基质金属蛋白酶9(MMP9)对大肠癌细胞肿瘤坏死因子受体1(TNFR1)表达的影响以及促进大肠癌侵袭和转移的可能途径. 方法:通过免疫荧光法研究TNFR1在大肠癌细胞SW1116中的表达;用MMP9干预培养的大肠癌SW1116细胞,用流式细胞术检测MMP9不同剂量和不同作用时间时TNFR1表达变化. 结果:①SW1116细胞表达TNFR1; ②MMP9对SW1116细胞表面TNFR1表达有下调作用,但有剂量和时间依赖性. 结论: MMP9下调大肠癌细胞表面TNFR1的表达,可能与大肠癌侵袭转移密切相关. 【关键词】 肠肿瘤;基质金属蛋白酶;肿瘤坏死因子受体 0引言 肿瘤坏死因子(tumor necrosis factor, TNF)是一种主要由单核巨噬细胞产生的多肽细胞因子,因其在内毒素处理后具有杀伤肿瘤细胞的作用而被命名为肿瘤坏死因子. TNF的生物学活性是通过存在于细胞表面的膜受体,即肿瘤坏死因子受体1(tumor necrosis factor receptor 1, TNFR1)和肿瘤坏死因子受体2(tumor necrosis factor receptor 2, TNFR2)介导. 体内外实验已证实肿瘤坏死因子受体(tumor necrosis factor receptor, TNFR)介导肿瘤坏死因子的肿瘤杀伤作用,体内有多种免疫活性因子(干扰素、白介素等)即通过激活上调TNFR以达到清除肿瘤的目的[1],因而诱导并稳定肿瘤细胞膜TNFR对机体抗肿瘤起非常重要的作用. 其他研究还证实大肠癌组织中存在基质金属蛋白酶(matrix metalloproteinase,MMPs)高表达或活性增强现象. 某些活性基质金属蛋白酶可能通过酶解作用促进肿瘤细胞膜TNFR的释放形成高水平的可溶性肿瘤坏死因子受体[2](soluble tumor necrosis factor receptor,sTNFR),是肿瘤细胞实现免疫逃逸的重要方式. 本研究通过检测TNFR1在肿瘤细胞膜的表达及MMP9对肿瘤细胞膜TNFR1表达的影响,探讨MMP9通过调节TNFR1促进大肠癌转移
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