u-PAR反义核酸载体对高侵袭人前列腺癌细胞PC-3M亚系侵袭能力的抑制效应

The Inhibitory Effects of an Antisense u-PAR Vector on Invasion by Highly Invasive Human Prostate Carcinoma PC-3M Cell Subclones

目的 :观察u PAR反义核酸载体对高侵袭力PC 3M亚系侵袭能力的抑制效应。方法 :利用单层细胞侵袭和软琼脂克隆形成实验 ,对比观察u PAR反义核酸对高侵袭亚系体外侵袭能力的影响 ;应用RT PCR和明胶酶谱法 ,分析u PAR反义核酸对高侵袭亚系MMP 9活性的影响 ,并且观察u PAR反义核酸载体转染前后的细胞亚系在裸鼠体内成瘤率及转移情况。结果 :转染u PAR反义核酸的高侵袭亚系体外侵袭能力和非贴壁依赖性生长能力均明显降低 ,抑制率分别为 79%和6 0 % ;u PAR反义核酸虽不影响高侵袭亚系MMP 9mRNA的转录 ,但对MMP 9酶原的激活有抑制作用 ;且转染u PAR反义核酸载体亚系的体内成瘤率和移植瘤的生长明显受到抑制 ,与对照组之间差异具有极显著性 (P <0 .0 1)。结论 :u PAR反义核酸对高侵袭亚系体外侵袭能力有较强抑制作用 ,并可显著抑制高侵袭亚系的体内生长能力。

Objective: To observe the inhibiting effects of an antisense u-PAR vector on invasion by highly invasive PC-3M cell subclones. Methods: The effects of an antisense vector on invasion by highly invasive PC-3M cell subclones were observed and compared in vitro by monolayer invasion assay and soft agar clone. Then, both a quantitative RT-PCR and zymography were used to exam the effects of the antisense u-PAR on activity of MMP-9 in those highly invasive cell subclones. Furthermore, the tumorigenesis rate and invasions by the cell subclones with or without the antisense u-PAR were observed in nude mice. Results: It is found that the speed of growth in vitro was slowing down by highly invasive PC-3M cell subclones transfected with the antisense u-PAR, and the ability of anchorage-independent growth of those cell subclones was also decreasing sharply,and the inhibiting rate was 79% and 60%, respectively. Although the antisense u-PAR didn′t change MMP-9 gene transcription, but they could inhibit the activation of MMP-9 of highly invasive PC-3M cell subclones. Moreover, the tumorigenesis rate of the cell subclones with the antisense u-PAR decreased and the growth of a neoplasm also slowed down. The t tests showed the difference between experimental and control groups reached statistical significance ( P <0.01). Conclusion: The antisense u-PAR vector could not only inhibit invasion by highly invasive PC-3M cell subclones in vitro but also restrain the growth of those cell subclones in vivo.