口腔鳞癌nm23—H1基因存在状态和颈淋巴结转移的关系

目的：探讨口腔鳞癌中nm23-H1基因结构变化和表达水平及其和颈淋巴结转移的关系。方法：用PCR法扩增了30例入口腔鳞癌，7例正常口腔粘膜标本及人舌鳞癌细胞系TSCCa和人口腔转移癌细胞系GNM nm23-H1基因，并对PCR产物进行SSCP分析；用原位杂交法检测鳞癌组织及两组细胞株nm23-H1mRNA水平，对其和颈淋巴结转移的关系进行统计学分析，结果：除1例口腔鳞癌外，所有标本均无nm23-H1结构变化。9例有转移的口腔鳞癌组织中有7例nm23-H1mRNA表达阴性，而1例无转移患者只有5例表达阴性，且GNM nm23-H1阳性率低于TSCCa(41.2%对63．1％）,nm23-H1表达与癌转移呈显著负相关（P＜0．01），nm23-H1表达和组织学分级无关。结论：nm23-H1 mRNA水平的变化不是由基因结构变化导致；nm23-H1基因产物对口腔鳞癌颈淋巴结转称有抑制作用。

Expression of nm23-H1 gene in oral squamous cell carcinoma and its relationship with metastasis to neck lymph nodes

Objective:To investigate the variation of nm23-H1 gene structure and its expression in oral squamous cell carcinoma (OSCC) and to study the relationship between nm23-H1 expression and OSCC metastasis to neck lymph nodes.Methods:nm23-H1 gene in the samples of 30 cases of OSCC,7 of normal oral mucous tissue,human OSCC cell line TSCCa and human oral metastatic cancer cell line GNM was extracted and amplified by PCR. PCR products were investegated with SSCP analysis;nm23 m RNA level in the samples was studied by in situ hybridization.The relationship between mRNA expression and metastasis to neck lymph nodes was analyzed statistically.Results： All samples showed no change in nm23-H1 gene structure except deletion in one case of OSCC;7 out of 9 cases with metastasis to neck lymph nodes showed no hybridization signal of nm23-H1 mRNA,however,only 5 were found no nm23-H1 mRNA in 21 cases without metastasis,positive rate of nm23-H1 expression in GNM cells was lower than that in TSCCa (41.2% versus 63.1%);The expression of nm23-H1 gene showed significant negative relationship with neck lymph nodes metastasis (P<0.01);no relationship was found between expression of nm23-H1 gene and cancer pathological classification.Conclusion:The change of nm23-H1 expression doesn't result from the variation of gene structure;the product of nm23-H1 gene probably inhibit OSCC metastasis to neck lymph nodes.