表皮生长因子受体表达水平对西妥昔单抗及其介导的抗体依赖的细胞介导的细胞毒作用杀伤肺腺癌A549细胞的影响

目的 探讨表皮生长因子受体(EGFR)表达水平对西妥昔单抗及其介导的抗体依赖的细胞介导的细胞毒作用(ADCC)对肺腺癌A549细胞杀伤的影响。方法 以肺腺癌A549细胞作为靶细胞,NKTm细胞作为效应细胞,将pEGFR-EGFP质粒用核转染技术导入A549细胞,免疫组织化学法检测转染组与野生组A549细胞表面EGFR蛋白的表达水平。采用细胞计数试剂盒-8法检测西妥昔单抗以及西妥昔单抗介导的ADCC作用对转染后A549细胞与野生组A549细胞的体外杀伤率。结果 免疫组织化学结果显示,野生组A549细胞EGFR表达呈弱阳性,而转染后的A549细胞EGFR表达呈强阳性。西妥昔单抗介导的ADCC作用对转染后高表达EGFR的A549细胞具有更强的杀伤作用(P<0.05),而西妥昔单抗单独作用时,转染组与野生组间的杀伤率差异无统计学意义(P>0.05)。结论 细胞表面EGFR蛋白的表达水平能够影响西妥昔单抗介导的ADCC作用对肺腺癌A549细胞的杀伤,而对西妥昔单抗本身的杀伤作用无影响。

Role of Epidermal Growth Factor Receptor Expression Level in Cetuximab Cytotoxicity and Antibody-dependent Cell-mediated Cytotoxicity Effect Against A549 Lung Cancer Cell Line

Objective To investigate the role of epidermal growth factor receptor(EGFR)expression level in cetuximab cytotoxicity and antibody-dependent cell-mediated cytotoxicity(ADCC)effect against A549 lung cancer cell line. Methods A549 cell line and NKTm cells were used as the target cell and the effector cell,respectively. pEGFR-EGFP plasmids were transfected into A549 cells by nucleofector method. EGFR expression levels were measured by immunohistochemistry. The ADCC activity induced by cetuximab was assessed by cell counting kit-8 assay. Results A549 cells transfected with pEGFR-EGFP plasmids expressed higher level of EGFR protein on membrane and were more sensitive to ADCC activity mediated by cetuximab(P<0.05). The inhibition rate of A549 cells showed no significant difference between transfection group and wild-type group when treated with cetuximab alone(P> 0.05). Conclusion EGFR expression level influences the sensitivity of A549 lung cancer cell line to ADCC activity mediated by cetuximab but not to cetuximab alone.