p53基因突变和STK15基因过表达与喉癌发生的关系

目的　探讨p5 3基因突变和STK15基因表达与喉癌发生发展的关系。方法　自 5 5例术前未经化疗和放疗的喉鳞状细胞癌患者的新鲜手术标本中 ,分别取配对癌组织和癌旁正常组织进行以下检测 :(1)提取DNA ,采用聚合酶链反应 单链构象多态性 (PCR SSCP)银染结合DNA直接测序 ,检测喉鳞癌组织中p5 3基因第 7外显子 (p5 3E7)和第 8外显子 (p5 3E8)的突变情况 ;(2 )提取总RNA ,反转录合成cDNA ,以 β actin为内对照进行PCR扩增 ,分析STK15基因表达的水平。结果　 5 5例喉癌组织中 ,17例 (30 .9% )发生p5 3E7突变 ,未发现p5 3E8突变 ;癌组织STK15基因表达与 β actin表达平均密度比值 (ADV)为 1.2 2± 0 .4 9。癌旁正常组织发生p5 3E7突变 1例 (1.8% ) ,p5 3E8突变 1例 (1.8% ) ;癌旁正常组织ADV为 0 .99± 0 .5 4。喉癌组织p5 3E7突变率显著高于癌旁正常组织 (χ2 =8.6 6 ,P <0 .0 1)。癌组织STK15基因表达高于癌旁正常组织 (t=4 .5 39,P <0 .0 1)。 17例p5 3基因突变的患者中 ,14例 (82 .4 % )癌组织STK15基因表达高于癌旁正常组织 ;38例癌组织STK15基因表达高于癌旁正常组织的患者中 ,14例 (36 .8% )存在p5 3E7突变。 2 5 .5 %的喉癌患者同时发生p5 3E7突变与STK15基因表达增高。结论　同时发生p5 3基因突变和STK

Mutation of p53 and overexpression of STK15 in laryngeal squamous-cell carcinoma

OBJECTIVE: To explore the relationship between p53 gene mutations and STK15 abnormal expression in the development of human laryngeal squamous-cell carcinoma (LSCC). METHODS: LSCC tissues and matched normal tissues were taken during operation from 55 patients without previous chemotherapy or radiotherapy. Following polymerase chain reaction amplification direct sequencing single strand conformational polymorphism (PCR-SSCP) combined with silver staining were used to detect mutations of p53 gene in exons 7 and 8 (p53E7 and p53E8) using genomic DNA from 110 specimens including 55 LSCC tissues and 55 matched normal tissues. STK15 expression were evaluated by RT-PCR with beta-actin as internal control. RESULTS: The mutation rate of p53E7 was 30.9% (compared to normal tissues, chi(2) = 8.66, P < 0.01). There was no mutation in p53E8. In 38 of the 55 cases (69.1%), the STK15 mRNA expression level was higher than that of the paired normal tissue. The STK15 to beta-actin ratio of average density value was 1.22 +/- 0.49 in the cancer tissue, and 0.99 +/- 0.54 in the normal tissues (t = 4.539, P < 0.01). In 14 of the 17 cases (82.4%) with p53E7 mutations, the STK15 expression was higher than that of normal tissue. In the 38 cases with STK15 over-expression, p53E7 mutation was found in 14 cases (36.8%). The rate of concurrence of p53E gene mutations and STK15 over-expression (25.5%) was higher than that of only p53E gene mutations (chi(2) = 26.025, P < 0.01). CONCLUSION: There is significant association between p53 gene mutation and STK15 over-expression in laryngeal squamous-cell carcinoma.