胃癌相关寡糖蛋白纯化及对正常人NK和LAK细胞活性的影响
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摘要: 本文采用一种植物血凝素-PHA亲和层析法从胃癌组织中提取胃癌相关寡糖蛋白,SDS-PAGE示纯化后胃癌相关寡糖蛋白以分子量40-45KD的成份含量最高;ELISA结合抑制法检测59例胃癌患者及33例良性消化道疾病患者血清,发现胃癌患者血清中胃癌相关寡糖蛋白表达水平明显增高,阳性率达71.2%,探索其对细胞免疫功能影响时,显示胃癌相关寡糖蛋白对正常人NK细胞及LAK细胞活性呈现显著的抑制作用,在1.0μg/ml浓度下,抑制率分别为40.84±6.21%和35.47±4.21%,推测在胃癌患者血清中升高的胃癌相关寡糖蛋白可能是一种使机体细胞免疫功能受损的免疲抑制因子。
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