S100A4细胞核表达与胃癌淋巴结转移相关

目的探讨S100A4蛋白在胃癌组织中的细胞内定位及其表达情况及与胃癌临床病理参数的关系。方法分离10对新鲜胃癌组织及配对的正常胃黏膜的核蛋白及浆蛋白，用蛋白印迹法检测S100A4蛋白在细胞内的定位。用免疫组织化学方法检测131例胃癌患者的胃癌组织和20例转移性淋巴结中S100A4蛋白的表达。结果S100A4蛋白在胃癌组织细胞核的表达阳性率为24．4％（32／131）。细胞浆表达阳性率为38．2％（50／131）。在32例S100A4核表达阳性的胃癌病例中，30例（93．8％）有淋巴结转移。伴淋巴结转移的胃癌组织中，S100A4细胞核表达阳性率（29．1％）显著高于没有淋巴结转移的胃癌组织中的S100A4细胞核表达的阳性率（7．1％）（P=0．016）。结论在胃癌组织中发现细胞核表达S100A4，并与胃癌淋巴结转移有关。

Nuclear expression of S100A4 is associated with lymph node metastasis in gastric carcinoma

OBJECTIVE: To investigate the intracellular localization of S100A4 in gastric carcinoma cells and the relationship between S100A4 expression status and lymph node metastasis of gastric carcinoma. METHODS: Western blotting analysis was performed to locate the expression of S100A4 protein in sub-fraction components of frozen tissues. S100A4 protein expression was also determined by immunohistochemical method in 131 samples of gastric cancer and 20 samples of matched metastatic lymph nodes. RESULTS: Thirty-two of 131 (24.4%) gastric carcinoma showed positive S100A4 nuclear expression and 50/131 (38.2%) carcinoma showed positive cytoplasmic expression. In 32 samples with positive S100A4 nuclear expression, 30 (93.8%) carcinomas had positive lymph node metastases. S100A4 nuclear expression level was higher in gastric carcinoma with lymph node metastasis (29.1%) than that without lymph node metastasis (7.1%) (P=0.016). CONCLUSION: Nuclear expression of S100A4 is associated with lymph node metastasis of gastric carcinoma.