摘要目的 探讨整合素连接激酶( ILK)基因对人海绵体平滑肌细胞收缩和舒张功能的影响.方法 人海绵体平滑肌细胞为实验对象,分为非沉默组、非处理对照组和ILK小干扰RNA(siRNA)实验组,采用siRNA干扰技术下调细胞中ILK的表达,伸展实验和基质胶黏附实验分别检测ILK基因敲减前后海绵体平滑肌细胞伸展和黏附能力变化,Transwell小室观察ILK表达对海绵体平滑肌细胞迁移能力的影响,荧光标记的鬼笔环肽染色海绵体平滑肌细胞观察ILK基因敲减前后细胞 骨架的变化.结果 黏附实验中,非沉默siRNA组、非处理对照组和实验组siRNA干扰的平滑肌细胞吸光度(A)值分别为0.184±0.034、0.179±0.028和0.092±0.010;迁移实验中,3组穿过Matrigel胶包被的Transwell小室的平滑肌细胞A值分别为0.184±0.017、0.188 ±0.013和0.106±0.003,实验组与非沉默siRNA组比较差异有统计学意义(P＜0.05);非处理对照组平滑肌细胞应力纤维错综分布于细胞周边与胞质内,而实验组的细胞应力纤维仅分布于细胞边缘.结论 ILK下调降低人海绵体平滑肌细胞的黏附、伸展、迁移能力,并通过影响细胞骨架重构参与调节平滑肌收缩与舒张状态,提示ILK基因有可能成为勃起功能障碍基因治疗的有效靶点.

abstractsObjective To investigate the changes of human penile smooth muscle cell contraction and stretch resulting from the integrin-linked kinase (ILK) gene knock-down.Methods Cultured human penile smooth muscle cells were knocked down for ILK using a small interfering RNA (SiRNA).Cellular ILK expression was quantified by Western blot analysis.Cell attachment,spreading and migration were also performed.Furthermore,microfilament dynamics was tested by means of Alexa Fluor 488 phalloidin stain.Results First,blocking the expression of ILK by siRNA significantly inhibited human penile smooth muscle cell attachment,speading and migration; moreover,ILK down-regulation affected actin cytoskeleton reorganization and changed cell morphology in human penile smooth muscle cell.Conclusions Targeting of ILK with a small interfering RNA not only inhibits human penile smooth muscle cell attachment,spreading and migration,but also effectively suppresses microfilament dynamics.This may be of potential therapeutic usefulness in treating erectile dysfunction (ED).