SU11274逆转肝细胞生长因子诱导不同EGFR基因型非小细胞肺癌细胞株对吉非替尼耐药

摘要

Background and purpose:Hepatocyte growth factor (HGF) induce epidermal growth factor receptor-tyrosine kinase inhibitor (EGFR-TKI) resistance in non-small cell lung cancer (NSCLC) cells, the mechanism might be related with activation of c-Met. The present study aimed to explore whether c-Met inhibitor SU11274 reverse gefitinib resistance induced by HGF in differentEGFR gene types of NSCLC.Methods:PC9 (EGFR-activating mutant), H292 (EGFR-wild type) and A549 (EGFR-wiled) were chosen. The experiments were divided into 6 groups:C group (control), H group (HGF), G group (geiftinib), S group (SU11274), GH group (geiftinib+HGF), GSH group (geiftinib+SU11274+HGF). The cell survival was measured by MTT assay; the cell apoptosis was measured by lfow cytometry (FCM); the expressions of c-Met, Stat3, Akt and Erk1/2 protein were examined by Western blot.Results:Gefitinib inhibited cell growth of 3 cells lines in a dose-dependent manner, and treating with HGF could relieve inhibition of cell growth caused by geiftinib. The cell survival when treating the HGF-induced cell lines with defferent concentration of geiftinib combined with SU11274 was signiifcantly decreased than that when treating HGF-induced cell lines with geiftinib alone. In 3 cell lines, the apoptosis rate in HGS group was higher than that in HG group (P<0.05). In three cells lines, the p-Met, p-Stat3, p-Akt and p-Erk1/2 expressions in HGS group were lower than that in HG group (P<0.05).Conclusion:SU11274 reversed geiftinib resistance induced by HGF in different EGFR gene types of NSCLC cells, the mechanism might be related with inhibiting the HGF-induced activation of c-Met and its downstream signaling pathway.%背景与目的：肝细胞生长因子(hepatocyte growth factor，HGF)诱导敏感非小细胞肺癌(non-small cell lung cancer，NSCLC)细胞对表皮生长因子受体酪氨酸激酶抑制剂(epidermal growth factor receptor-tyrosine kinase inhibitor，EGFR-TKI)耐药，其机制与c-Met激活有关。本研究探讨c-Met抑制剂SU11274逆转HGF诱导的不同EGFR基因型NSCLC细胞株对吉非替尼耐药及逆转耐药机制。方法：选择人NSCLC细胞株PC9(EGFR突变型)、H292(EGFR野生型)和A549(EGFR野生型)，应用吉非替尼和SU11274单独或联合作用于HGF诱导的细胞株。实验分为6组：C组(不加药对照组)、H组(HGF处理组)、G组(吉非替尼处理组)、S组(SU11274处理组)、HG组(HGF+吉非替尼处理组)和HGS组(HGF+吉非替尼+SU11274处理组)。MTT法检测对细胞增殖的影响，流式细胞术检测细胞凋亡的影响；应用蛋白质印迹法(Western blot)检测细胞中c-Met及其下游通道Stat3、Akt和Erk1/2蛋白表达水平。结果：吉非替尼对3种细胞的生长抑制作用均呈浓度依赖性，HGF处理能够缓解吉非替尼的增殖抑制作用(P<0.05)；不同浓度吉非替尼联合SU11274作用于HGF诱导细胞时，3种细胞株存活率比吉非替尼单独作用于HGF诱导细胞时明显降低(P<0.05)；HGS组的细胞凋亡比HG组明显增加(P<0.05)；HGS组的c-Met、Stat3、Akt和Erk1/2活化蛋白量比HG组明显减少。结论：c-Met抑制剂SU11274可逆转HGF诱导的不同EGFR基因型NSCLC细胞株对吉非替尼耐药，其机制可能与抑制HGF活化的c-Met及其下游通道蛋白表达有关。