作者:Mengxiong Wang、Renan B. Ferreira、Mary E. Law、Bradley J. Davis、Elham Yaaghubi、Amanda F. Ghilardi、Abhisheak Sharma、Bonnie A. Avery、Edgardo Rodriguez、Chi-Wu Chiang、Satya Narayan、Coy D. Heldermon、Ronald K. Castellano、Brian K. Law
DOI:10.1038/s41388-019-0717-6
日期:2019.5
While HER2 and EGFR are overexpressed in breast cancers and multiple other types of tumors, the use of EGFR and/or HER2 inhibitors have failed to cure many cancer patients, largely because cancers acquire resistance to HER2/EGFR-specific drugs. Cancers that overexpress the HER-family proteins EGFR, HER2, and HER3 are uniquely sensitive to agents that disrupt HER2 and EGFR protein folding. We previously showed that disruption of disulfide bond formation by Disulfide Disrupting Agents (DDAs) kills HER2/EGFR overexpressing cells through multiple mechanisms. Herein, we show that interference with proline isomerization in HER2/EGFR overexpressing cells also induces cancer cell death. The peptidyl-prolyl isomerase inhibitor Cyclosporine A (CsA) selectively kills EGFR+ or HER2+ breast cancer cells in vitro by activating caspase-dependent apoptotic pathways. Further, CsA synergizes with the DDA tcyDTDO to kill HER2/EGFR overexpressing cells in vitro and the two agents cooperate to kill HER2+ tumors in vivo. There is a critical need for novel strategies to target HER2+ and EGFR+ cancers that are resistant to currently available mechanism-based agents. Drugs that target HER2/EGFR protein folding, including DDAs and CsA, have the potential to kill cancers that overexpress EGFR or HER2 through the induction of proteostatic synthetic lethality.
虽然HER2和EGFR在乳腺癌和其他多种肿瘤中过度表达,但使用EGFR和/或HER2抑制剂未能治愈许多癌症患者,这主要是因为癌症对HER2/EGFR特异性药物产生了抗药性。过度表达HER家族蛋白EGFR、HER2和HER3的癌症对破坏HER2和EGFR蛋白折叠的药物特别敏感。我们之前已经证明,二硫键破坏剂(DDA)通过多种机制破坏二硫键的形成,从而杀死过度表达HER2/EGFR的细胞。在此,我们证明,干扰HER2/EGFR过度表达细胞中的脯氨酸异构化也会诱导癌细胞死亡。肽-脯氨酸异构酶抑制剂环孢菌素A(CsA)通过激活依赖半胱天冬酶的凋亡途径,选择性地杀死体外EGFR+或HER2+乳腺癌细胞。此外,CsA与DDA tcyDTDO协同作用,杀死体外HER2/EGFR过度表达细胞,这两种药物共同杀死体内HER2+肿瘤。迫切需要针对HER2+和EGFR+癌症的新策略,这些癌症对目前基于机制的药物具有抗药性。靶向HER2/EGFR蛋白折叠的药物,包括DDA和CsA,有可能通过诱导蛋白质合成致死性来杀死过度表达EGFR或HER2的癌症。