非小细胞肺癌细胞对 MET 激酶抑制的获得性耐药是由向表皮生长因子受体依赖性的转变介导的。
Acquired resistance of non-small cell lung cancer cells to MET kinase inhibition is mediated by a switch to epidermal growth factor receptor dependency.
机构信息
Center for Molecular Therapeutics, Massachusetts General Hospital Cancer Center and Harvard Medical School, Charlestown, Massachusetts 02129, USA.
出版信息
Cancer Res. 2010 Feb 15;70(4):1625-34. doi: 10.1158/0008-5472.CAN-09-3620. Epub 2010 Feb 2.
Cancer cells harboring MET amplification display striking sensitivity to selective small molecule inhibitors of MET kinase, prompting their clinical evaluation. Similar to the experience with traditional therapeutics, most patients responding to treatment with such molecular targeted therapeutics ultimately relapse with drug-resistant disease. In this study we modeled acquired resistance to experimental MET kinase inhibitor PF2341066 in MET-amplified non-small cell lung carcinoma (NSCLC) cell lines to identify drug resistance mechanisms that may arise in clinic. We found that activation of the epidermal growth factor receptor (EGFR) pathway emerges as a resistance mechanism in MET-amplified cells after prolonged exposure to PF2341066. Whereas combined inhibition of MET and EGFR kinases in MET-dependent NSCLC cells did not enhance their initial sensitivity to PF2341066, this combination dramatically suppressed the eventual emergence of drug-resistant clones after prolonged drug exposure. Conversely, activation of the EGFR pathway increased the yield of PF2341066-resistant clones, confirming the significance of this pathway in conferring resistance. Our findings support an intimate relationship between the EGFR and MET signaling pathways in NSCLC, and they suggest that combination treatment with MET and EGFR kinase inhibitors may be beneficial in MET-amplified NSCLC by reducing selection for drug resistant clones.
携带 MET 扩增的癌细胞对 MET 激酶的选择性小分子抑制剂表现出显著的敏感性,促使其进行临床评估。与传统治疗药物的经验类似,大多数对这种分子靶向治疗药物治疗有反应的患者最终会因耐药性疾病而复发。在这项研究中,我们模拟了对实验性 MET 激酶抑制剂 PF2341066 的获得性耐药,以鉴定可能在临床上出现的耐药机制。我们发现,在长时间暴露于 PF2341066 后,表皮生长因子受体(EGFR)通路的激活成为 MET 扩增的非小细胞肺癌(NSCLC)细胞系中的一种耐药机制。虽然在 MET 依赖性 NSCLC 细胞中联合抑制 MET 和 EGFR 激酶并没有增强它们对 PF2341066 的初始敏感性,但这种联合用药在长时间药物暴露后,显著抑制了耐药克隆的最终出现。相反,EGFR 通路的激活增加了 PF2341066 耐药克隆的产量,证实了该通路在赋予耐药性方面的重要性。我们的研究结果支持 NSCLC 中 EGFR 和 MET 信号通路之间的密切关系,并表明联合使用 MET 和 EGFR 激酶抑制剂可能通过减少耐药克隆的选择,对 MET 扩增的 NSCLC 有益。