人端粒保护蛋白POT1和TRF2在喉癌中的表达

Expression of human protection of telomeres1 (POT1) and telomeric repeat binding factor-2 (TRF2)in laryngneal squamous cell carcinoma

目的探讨人端粒保护蛋白1(human protection of telomeres1,POT1)和端粒重复序列结合因子2(telomeric repeat binding factor-2,TRF2)在喉鳞状细胞癌(简称喉癌)及声带息肉中的表达及意义。方法采用间接免疫荧光法检测20例喉癌、19例声带息肉中POT1和TRF2的表达水平。结果POT1和TRF2在喉癌中的阳性表达率为65.00%和70.00%,在声带息肉中未见POT1和TRF2的表达。POT1在低分化喉癌中的表达高于POT1在高及中分化喉癌中的表达(P<0.05),POT1的表达水平在喉癌的不同发生部位、T分级、临床分期及淋巴结转移率中的差异无统计学意义(P<0.05)。TRF2的表达程度与肿瘤的发生部位、组织病理、T分级、淋巴结转移率和临床分期均无关(P<0.05)。相关分析显示喉癌中POT1的表达与TRF2的表达无相关性(P<0.05)。结论POT1和TRF2在喉癌中高表达,两者在喉癌的发生中可能起重要作用。POT1在喉癌中的表达与肿瘤的分化程度有关。

OBJECTIVE To study the significance by analyzing the expression of human protection of telomeresl （POT1） and telomeric repeat binding factor-2 （TRF2） in the tissues of laryngneal squamous cell carcinoma （LSCC） and in polyp of vocal cord tissues. METHODS The expression of POT1 and TRF2 in 20 tumor samples and 19 polyp of vocal cord were determined by the indirect immunofluorescence method. The results were scored and analyzed statistically. RESULTS The positive expression rates of POT1 and TRF2 in tumor samples was 65.00% and 70.00% respectively. There were no positive expression of POT1 and TRF2 in polyp of vocal cord. The positive expression of POT1 was higher in poorly differentiated laryngeal carcinoma than that in well-differentiated and moderately differentiated laryngeal carcinoma（Chi-square test with contingency table, P〈0.05） . The expression of POT1 in different primary sites, T-grading, clinical stage and lymph node metastases indicated no statistical difference. The expression of TRF2 in different primary sites, T-grading, clinical stage and lymph node metastases indicated no statistical difference. There was no correlation between the expression of POT1 and TRF2 in tumor samples（Spearman rank correlation test, P〉0.05） . CONCLUSION The expression of POT1 and TRF2 in laryngneal squamous cell carcinoma were remarkable, POT1 and TRF2 may play a critical role in tumorigenesis of laryngneal squamous cell carcinoma. There was statistical significant difference for degrees of POT1 expression in different tumor histological grades.