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2015年11月6日讯 /生物谷BIOON/ --近日,一项发表在国际学术期刊Oncotarget上的最新研究发现了一种能够显著抑制具有药物抗性的非小细胞肺癌(NSCLC)生长的小分子化合物,对于解决非小细胞肺癌病人的获得性药物抵抗问题具有重要意义。
许多研究已经证明表皮生长因子受体(EGFR)在非小细胞肺癌中发挥重要作用,一些针对EGFR开发的酪氨酸激酶抑制剂如gefitinib已经用于非小细胞肺癌病人的临床治疗,并且取得了良好的治疗效果。然而许多病人在进行6到12个月的治疗后会产生对gefitinib的获得性抵抗,这对于使用该药物进行治疗的病人来说是一件非常不幸的事。有研究已经发现这种对gefitinib产生的药物抵抗作用主要与EGFR蛋白上出现的双突变有关。
在这项最新研究中,研究人员发现了一种编号为244-MPT的化合物能够抑制gefitinib敏感性和抵抗性肺癌细胞的生长和克隆形成能力,同时还会抑制野生型与双突变型EGFR的激酶活性。
研究人员还对244-MPT作用发挥的机制进行了研究,他们发现无论是在gefitinib敏感性肺癌细胞还是抵抗性肺癌细胞中,这种化合物都能够以一种ATP-竞争性方式结合野生型或双突变EGFR,显著降低EGFR的磷酸化水平,并进一步抑制其下游的Akt和ERK1/2途径,除此之外,该化合物还可以诱导gefitinib抗性细胞系发生凋亡,并抑制异种移植小鼠模型体内具有gefitinib抗性的NSCLC肿瘤的生长。
研究人员还利用肿瘤模型研究的金标准--人源异种移植模型(PDX model)对244-MPT的作用效果进行了检测,结果表明该化合物能够有效减小PDX模型体内具有gefitinib抗性的NSCLC肿瘤尺寸。
该项工作表明直接靶向EGFR能够很好地解决非小细胞肺癌病人对gefitinib产生的抗性问题,对于帮助病人获得更好的治疗效果具有重要意义。(生物谷Bioon.com)
原文:
DOI: 10.18632/oncotarget.6236
244-MPT over comes gefitinib resistance in non-small cell lung cancer cells
Yi Zhang1,2,3,4,*, Ke Yao1,2,4,*, Chengcheng Shi1,3,4,*, Yanan Jiang2,*, Kangdong Liu1,2,4, Song Zhao3, Hanyong Chen1, Kanamata Reddy1, Chengjuan Zhang1,2,5, Xiaoyu Chang1, Joohyun Ryu1, Ann M. Bode1, Ziming Dong2, Zigang Dong
The epidermal growth factor receptor (EGFR) is known to play a critical role in non-small cell lung cancer(NSCLC). Several EGFR tyrosine kinase inhibitors(TKIs), such as gefitinib, have been used as effective clinical therapies for patients with NSCLC. Unfortunately, acquired resistance to gefitinib commonly occurs after 6-12 months of treatment. The resistance is associated with the appearance of the L858R/T790M double mutation of the EGFR. In our present study, we discovered a compound,referred to as 244-MPT, which could suppress either gefitinib-sensitive or -resistant lung cancer cell growth and colony formation, and also suppressed the kinase activity of both wildtype and double mutant (L858R/T790M) EGFR. The underlying mechanism reveals that 244-MPT could interact with either the wildtype or double-mutant EGFR in an ATP-competitive manner and inhibit activity. Treatment with 244-MPT could substantially reduce the phosphorylation of EGFR and its downstream signaling pathways, including Akt and ERK1/2 in gefitinib-sensitive and -resistant cell lines. It was equally effective in suppressing EGFR phosphorylation and downstream signaling in NL20 cells transfected with wildtype, single-mutant (L858R) or mutant (L858R/T790M) EGFR. 244-MPT could also induce apoptosis in a gefitinib-resistant cell line and strongly suppress gefitinib-resistant NSCLC tumor growth in a xenograft mouse model. In addition, 244-MPT could effectively reduce the size of tumors in a gefitinib-resistant NSCLC patient-derived xenograft (PDX) SCID mouse model. Overall, 244-MPT could overcome gefitinib-resistance by directly targeting the EGFR. |