肾母细胞瘤过表达基因和WT1基因在肾癌组织中转录水平的定量研究

目的 研究肾癌组织中肾母细胞瘤过表达基因（NOV）及WT1基因mRNA定量表达水平及意义。方法 肾癌组织标本57例。男40例，女17例，平均年龄65岁。T139例、T213例、T3a5例；G114例、G223例、G320例。应用实时RT—PCR方法定量检测癌组织及36例癌旁正常肾组织中NOV和WT1的mRNA表达，并对2种基因表达水平进行相关性分析。结果 肾癌组织NOVmRNA表达水平中位值（1．17）显著低于癌旁正常组织（4．32，P〈0．05），乳头状肾癌组织表达量（2．67）显著高于透明细胞癌（1．06，P〈0．05），G．肿瘤表达量（4．61）显著高于G2～G3肿瘤（1．11，P〈0．05）。NOV表达与肿瘤分期、大小等无显著相关。WT1mRNA在肾癌组织中的表达水平中位值（0．13）显著低于癌旁正常组织（1．93，P〈0．05），WT1表达与肿瘤分期、分级、组织类型等均无关。NOVmRNA与WT1mRNA表达水平无明显相关。结论 NOV基因与肾癌的发生和分化相关。WT1在肾癌组织中表现为低表达。NOV表达是否受WT1的调节尚需进一步研究。

The expression of NOV and WT1 genes in renal cell carcinoma:a quantitative RT-PCR analysis

Objective To investigate the quantitative expression of mRNA levels of human NOV and WT1 genes in renal cell carcinoma ( RCC). Methods Using quantitative real-time RT-PCR analysis, we quantified NOV and WT1 mRNA levels in the samples from 57 patients (40 men and 17 women; mean age,65 years) with RCC. Of them,39 cases had T1 stage tumor, 13 had T2 stage and 5 had T3a stage by UICC pathologic staging;and 14 cases had G1 tumor,23 had G2 and 20 had G3 by Fuhrman grading. The expression levels of NOV and WT1 genes,and their association were analyzed. Results The median level of NOV mRNA expression was significantly lower in RCC ( 1. 17) than in normal kidney tissue (4. 32, P < 0.05). The median level of NOV mRNA expression was significantly higher in papillary RCC (2.67) than in clear cell RCC (1.06 ,P <0.05) ,and higher in G1 tumor (4.61) than in G2 and G3 tumors (1.11 ,P < 0.05). The NOV expression was not significantly associated with tumor staging and size. The WT1 mRNA was also down-regulated in RCC;its median level (0. 13) was significantly lower than in normal kidney tissue ( 1. 93, P < 0. 05 ). WT1 expression had no relation with stage, grade, size and histological types of RCC. No correlation between NOV and WT1 expression could be demonstrated. Conclusions The results suggest that NOV gene may play a role in RCC development and differentiation. The WT1 gene was low expressed in RCC tissue. Whether NOV expression is regulated by WT1 needs further study.