乙酰肝素酶反义寡核苷酸对人乳腺癌细胞株MDA435侵袭力的抑制作用

目的：探讨乙酰肝素酶（HPSE）反义寡脱氧核苷酸对人乳腺癌细胞株MDA435侵袭力的抑制作用。方法：设计合成互补于HPSE mRNA起始密码区的硫代反义寡脱氧核苷酸AS－ODN及相应的无义对照寡脱氧核苷酸NS－ODN,以阳离子脂质体Lipofectin包埋后转染MDA435细胞,以逆转录－聚合酶链反应（RT－PCR）检测转染后HPSE mRNA表达的变化,以Western印迹检测HPSE蛋白表达的变化,以定量Matrigel侵袭实验检测MDA435细胞侵袭力的变化。结果：与正常对照组、脂质体对照组和NS－ODN相应浓度组相比,AS－ODN各浓度组对HPSE mRNA和蛋白的表达及细胞侵袭力均有明显抑制作用（P＜0．01）,其抑制效应在不同浓度组间差别显著P＜0．01）。AS－ODN在终浓度为0．1μmol/L,0.2μmol/L和0．4μmol/L时对MDA435细胞的侵袭力抑制率分别为34．0％、57．8％和79．7％。结论：HPSE反义寡脱氧核苷酸通过下调HPSE mRNA在蛋白的表达可显著抑制人乳腺癌细胞株MDA435的侵袭力,并呈剂量依赖性。

Inhibition of invasiveness of human mammary carcinoma cell line MDA435 by heparanase antisense oligodeoxynucleotide

OBJECTIVE: To evaluate the inhibitory effect of heparanase antisense oligodeoxynucleotide (AS-ODN) on the invasiveness of human mammary carcinoma cell line MDA435. METHODS: The AS-ODN complementary to the start codon region of heparanase mRNA and its control, scrambled nonsense oligodeoxynucleotide (NS-ODN) were designed and synthesized and phosphorothioated. The ODNs were embedded in cationic liposome Lipofectin and transfected into MDA435 cells. The total RNAs and proteins were extracted from the cells 48 hours after transfection and then semi-quantitative RT-PCR and Western blotting were performed to evaluate the heparanase gene and protein expression levels respectively. The invasiveness of transfected MDA435 cells were measured quantitatively by Matrigel invasion assays. RESULTS: The heparanase gene and protein expression and invasiveness of MDA435 cells treated with AS-ODN of different final concentrations were significantly decreased compared with that of the controls (P < 0.01). Besides, the inhibitory effects were significantly different between the cells treated with AS-ODN of different concentrations (P < 0.01). The invasiveness inhibition rates were 34.0%, 57.8% and 79.7% at the cells treated with AS-DON of the final concentrations of 0.1 micro mol/L, 0.2 micro mol/L, and 0.4 micro mol/L, respectively. CONCLUSION: Heparanase AS-DON complementary to the start codon region of heparanase mRNA has a significant inhibitory effect on the invasiveness of human mammary carcinoma cell line in a dose-dependent manner.