摘要目的 探讨超声破裂载基因微泡增强心肌细胞反义RNA转染与表达的效应.方法 构建受磷蛋白(phospholamban,PLB)反义RNA真核表达质粒PcDNA 4.1-asPLB,采用磷酸钙共沉淀、超声辐照及超声破裂载基因微泡等方法介导反义RNA转染.采用RT-PCR及Western blot检测心肌细胞PLB、肌浆网钙ATP酶(sarcoplasmic retculum Ca2+ATPase,SERCA2a)mRNA和蛋白表达水平,观察不同方法介导PLB反义RNA转染对心肌细胞PLB及SERCA2a表达的影响.结果 与空载体PcDNA4.1比较,PcDNA4.1-asPLB能特异地抑制心肌细胞PLB表达(P＜0.05).超声破裂载基因微泡明显增强反义RNA转染与表达,与其他转染组比较差异具有统计学意义(P＜0.05).PcDNA4.1-asPLB对SERCA2a表达无明显影响,但降低PLB/SERCA2a比值.结论 超声破裂载基因微泡是一种高效的反义RNA转染方法,其介导PcDNA4.1-asPLB转染能明显抑制心肌细胞PLB表达.

abstractsObjective To explore whether ultrasound-mediated microbubbles destruction could enhance anti-sense RNA transfection and expression. Methods Phospholamban antisense RNA eukaryon vector PcDNA 4. 1-asPLB was successfully constructed and it was transfected into cardiac myocytes by various methods including calcium phosphate precipitation, ultrasound exposure and ultrasound-mediated microbubbles destruction. The expression of PLB and sarcoplasmic retculum Ca2+ ATPase (SERCA2a) in cardiac myocytes was tested by RT-PCR and western blot. Results The transfection and expression of PcDNA 4. 1-asPLB increased significantly in cells treated with ultrasound-mediated microbubbles destruction compared to other transfer groups( P ＜0.05). The expression of PLB was inhibited specifically after cardiac myocytes were transfected with PcDNA 4. 1-asPLB. There was no change of PLB expression after cardiac myocytes transfected with PcDNA 4. 1 ( P ＜0.05). Though the expression of SERCA2a never exhibited any changes after PcDNA 4. 1-asPLB transfection, the PLB/SERCA2a ratio decreased markedly. Conclusions As a highly effective antisense RNA transfer method, ultrasound-mediated microbubbles destruction can enhance the transfection and expression of the PcDNA 4. 1-asPLB significantly. The PcDNA4. 1-asPLB transfection inhibits the expression of PLB and result in decrease of PLB/SERCA2a ratio in cardiac myocytes.