组织因子促进人类大肠癌细胞的侵袭及与基质金属蛋白酶类的相关性研究

Role of tissue factor in the invasion of cultured human colon carcinoma cells and its correlation with Matrix metalloproteinases

目的:探讨组织因子促进人类大肠癌细胞侵袭的机制,研究其与MMP 2和MMP 9的相关性。方法:获取转染正义/反义TFcDNA的人类大肠癌HT 29细胞系/LoVo细胞系裸鼠皮下种植瘤标本,应用Westernblot和RT PCR技术,检测转染组和对照组肿瘤组织中MMP 2和MMP 9的蛋白和mRNA表达水平;同时采用明胶酶谱法检测转染反义LoVo细胞系培养上清中的MMP 2和MMP 9活性的变化。结果:与对照组相比较,转染正义TFcDNA的HT 29细胞系成瘤标本TF表达升高,其所对应的MMP 9和MMP 2蛋白水平和mRNA水平表达也明显升高; 转染反义TFcDNA的LoVo细胞系成瘤标本中的TF,MMP 9和MMP 2蛋白和mRNA水平表达明显低于对照组,转染反义TFcDNA的LoVo细胞系培养上清液中的MMP 9和MMP 2活性较对照组低;MMP 9和MMP 2表达与组织因子表达具有相关性。结论:组织因子促进人类大肠癌细胞的侵袭,其部分机制可能与组织因子上调MMP 9和MMP 2的表达有关,组织因子可能是大肠癌细胞分泌MMPs的内在激动剂。

Objective: To investigate the role of tissue factor expression in the invasive ability of human colon carcinoma cells and to analyze the correlation between tissue factor and MMP-2 and MMP-9. Methods: HT-29 cells with sense-TFcDNA transfection and LoVo cells with antisense-TFcDNA transfection were implanted subcutaneously into nude mice as well as controls. The expressions of MMP-9 and MMP-2 at the protein and mRNA levels were detected by Western blot and RT-PCR respectively; Gelatin zymography was used for assay of the MMP-9 and MMP-2 activiies in the supernatant cultured media of LoVo cells with antisense-TFcDNA transfection and controls. Results: The expressions of MMP-9 and MMP-2 at the protein and mRNA levels in the group of HT-29 cells with sense-TFcDNA were significantly increased with untransfected HT-29 cells.The expression in the group of LoVo cells with antisense- TFcDNA had a significant decrease than that of the controls.The MMP-9 and MMP-2 activities of LoVo cells with antisense-TFcDNA were weakened because of the lower expression of tissue factor by gelatin zymography. The expression of MMP-9 and MMP-2 were closely correlated to the expression of tissue factor. Conclusion: Tissue factor can increase the invasive ability of human colon carcinoma cells. The partial mechanism is that TF can upregulate the expressions of MMP-9 and MMP-2.Tissue factor may be an inner agonist in the secrection of MMPs in colon carcinoma cells.