MUC1的表达与乳腺癌细胞粘附的关系

背景与目的:近年研究认为,肿瘤的转移与肿瘤细胞膜上粘液型糖蛋白的大量形成有关。本实验研究糖基化抑制剂苯甲基-α-N-乙酰半乳糖胺对粘蛋白-1(mucin1,MUC1)形成的抑制作用及其对乳腺癌细胞株MDA-MB-231细胞的粘附、侵袭转移能力的影响。方法:免疫细胞化学法检测MUC1表达,噻唑蓝比色法(MTT)检测细胞对人工基底膜(Matrigel)的粘附能力,明胶酶谱法(zymography)检测MDA-MB-231细胞MMP-2、MMP-9的分泌变化。结果:经苯甲基-α-N-乙酰半乳糖胺去糖基化处理后的肿瘤细胞组与相应对照组比较,MUC1表达降低,对基底膜的粘附力明显降低(P<0.01),同时细胞中MMP-2和MMP-9的分泌量显著下降。结论:MUC1表达水平与肿瘤细胞的粘附能力相关,MUC1的抑制使乳腺癌MDA-MB-231细胞粘附能力,分泌Ⅳ型胶原酶能力明显减弱。

Correlation of MUC1 expression to adhesion of breast cancer cell line MDA-MB-231

BACKGROUND & OBJECTIVE: Recent researches found that an abundant production of mucin protein well correlates with tumor cell metastasis. This study was to investigate inhibitory effect of benzyl-alpha-GalNAc on production of mucin 1 (MUC1), and on adhesion and invasion of breast cancer cell line MDA-MB-231. METHODS: MDA-MB-231 cells were incubated with benzyl-alpha-GalNAc, expression of MUC1 was detected by immunohistochemistry, adhesive ability of MDA-MB-231 cells to artificial basement membrane Matrigel was measured by MTT assay. Gelatin zymography was performed to detect the secretion changes of matrix metalloproteinase-2 (MMP-2) and MMP-9. RESULTS: Compared with control cells, the tumor cells deglycosylated by benzyl-alpha-GalNAc showed lower expression of MUC1 (P < 0.05), and less adhesion to the Matrigel (P< 0.01), the secretion of MMP-2 and MMP-9 suppressed (P< 0.05). CONCLUSION: The expression of MUC1 correlates to adhesion and invasion of MDA-MB-231 cells, benzyl-alpha-GalNAc may weaken adhesion and type IV collagenase-secreting activity of MDA-MB-231 cells by inhibiting MUC1.