vMIP-Ⅱ通过 CXCR4拮抗乳腺癌转移作用的初步研究

背景与目的: CXCR4-SDF-1α体系在乳腺癌靶向转移中具有重要作用,已证明多种 CXCR4拮抗剂对乳腺癌转移有抑制作用.本研究拟探讨作为 CXCR4封闭因子的病毒巨噬细胞炎症蛋白Ⅱ( viral macrophage inflammatory protein-Ⅱ , vMIP-Ⅱ)对乳腺癌细胞株 MCF 7转移相关因素的影响.方法: MTT法检测不同浓度 vMIP-Ⅱ刺激下 MCF-7的增殖效应;软琼脂集落形成实验评价克隆形成率;粘附和趋化实验观察 vMIP-Ⅱ对不同转移阶段 MCF-7细胞的作用.结果:(1)系列浓度的 vMIP-Ⅱ处理细胞 72h后,细胞没有表现出增殖效应( P >0.05). (2)vMIP-Ⅱ以浓度依赖的方式抑制细胞集落的形成, 50、 100、 500和 1 000 ng /ml vMIP-Ⅱ作用后,细胞的琼脂集落抑制率在 18.2%～ 54.6%之间. (3)经 300 ng/ml 的 vMIP-Ⅱ处理不同时间( 0 min、 30 min、 2 h 和 6 h)后,细胞在 2 h对纤维连接素( FN)和 Matrigel的粘附都达到了抑制高峰. (4)在趋化实验中, 500 ng/ml vMIP-Ⅱ组穿膜细胞数( 24± 10)比对照组( 60± 9)要低( P< 0.05).结论: MCF 7的克隆形成率与 vMIP-Ⅱ的刺激浓度呈负相关. vMIP-Ⅱ能降低 MCF-7对 FN和 Matrigel的粘附和有效抑制 MCF-7 对人肺蛋白粗提物的靶向性趋化作用.

Inhibitory effect of viral macrophage inflammatory protein-II on metastasis of breast cancer cell line MCF-7 through antagonising CXCR4

BACKGROUND & OBJECTIVE: CXCR4-stromal cell-derived factor-1 (CXCR4-SDF-1alpha) system has been proved to be involved in targeting metastasis of breast cancer. Some antagonists of CXCR4 have inhibitory effects on metastasis of breast cancer. This study was to investigate effect of viral macrophage inflammatory protein-II (vMIP-II), an antagonist of CXCR4, on metastasis of breast cancer cell line MCF-7. METHODS: Proliferation of MCF-7 cells stimulated by vMIP-II of different concentrations (10, 50, 100, 500, and 1 000 ng /ml) was detected by MTT assay, clone formation rate was assessed by agar clone assay. Adhesion and chemotaxis assays were also used to evaluate the effect of vMIP-II on MCF-7 cells in different steps of metastasis. RESULTS: MCF-7 cells treated with vMIP-II of a series of concentrations for 72 h showed no proliferation change (P >0.05). vMIP-II (50-1 000 ng /ml) suppressed colony formation of MCF-7 cells in a concentration-dependent manner. After MCF-7 cells treated with 300 ng/ml of vMIP-II for different time (0, 0.5, 2, and 6 h), inhibition peak of cell adherence to fibronectin (FN) and Matrigel was observed. The number of migration was low in MCF-7 cells in the presence of vMIP-II of 500 ng/ml (24+/-10) was lower than that of control MCF-7 cells (60+/-9) (P< 0.05). CONCLUSIONS: The clone formation rate of MCF-7 cells may negatively correlates with the concentration of vMIP-II. vMIP-II may inhibit MCF-7 cells adhesion to FN and Matrigel, and suppress chemotactic activity of MCF-7 cells toward extracts of human lung protein.