根据p21基因序列设计合成特异性检测p21mRNA的分子信标,发展了一种体外快速、定量检测p21mRNA的新方法,将其用于肿瘤细胞p21mRNA表达水平的检测.结果发现:抑制p53表达引起CNE2细胞中p21mRNA表达水平降低,转染ING1诱导MCF-7细胞中p21mRNA表达上调,5-氟尿嘧啶处理MCF-7细胞后p21mRNA表达水平呈浓度和时间相关性变化.这种特异性强、操作快速、简便的新方法有望广泛用于各类样品中p21mRNA表达水平检测.
A molecular beacon,which was designed and synthesized according to the p21 gene sequence,was applied to develop a new method for quantitative detection of p21 mRNA in cellular total RNA.The results showed that p21 mRNA is inhibited by silencing p53 in CNE2 cells while it is upregulated in MCF-7 cells by ING1 transfection,the influence of 5-FU treatment on p21 mRNA of MCF-7 cells is time and concentration-dependent manner.These results demonstrated that the new method with the advantage of high specificity,fast speed and simplicity can be widely applied for p21 mRNA detection in different samples.