Novel Hybrid Compound of a Plinabulin Prodrug with an IgG Binding Peptide for Generating a Tumor Selective Noncovalent-Type Antibody–Drug Conjugate
作者:Kyohei Muguruma、Fumika Yakushiji、Ryosuke Kawamata、Daichi Akiyama、Risako Arima、Takuya Shirasaka、Yamato Kikkawa、Akihiro Taguchi、Kentaro Takayama、Takeshi Fukuhara、Tetsuro Watabe、Yuji Ito、Yoshio Hayashi
DOI:10.1021/acs.bioconjchem.6b00149
日期:2016.7.20
Although several approaches for making antibody–drug conjugates (ADC) have been developed, it has yet to be reported that an antibody binding peptide such as Z33 from protein A is utilized as the pivotal unit to generate the noncovalent-type ADC (NC-ADC). Herein we aim to establish a novel probe for NC-ADC by synthesizing the Z33-conjugated antitumor agent, plinabulin. Due to the different solubility of two components, including hydrophobic plinabulin and hydrophilic Z33, an innovative method with a solid-supported disulfide coupling reagent is required for the synthesis of the target compounds with prominent efficiency (29% isolated yield). We demonstrate that the synthesized hybrid exhibits a binding affinity against the anti-HER2 antibody (Herceptin) and the anti-CD71 antibody (6E1) (Kd = 46.6 ± 0.5 nM and 4.5 ± 0.56 μM, respectively) in the surface plasmon resonance (SPR) assay. In the cell-based assays, the hybrid provides a significant cytotoxicity in the presence of Herceptin against HER2 overexpressing SKBR-3 cells, but not against HER2 low-expressing MCF-7 cells. Further, it is noteworthy that the hybrid in combination with Herceptin induces cytotoxicity against Herceptin-resistant SKBR-3 (SKBR-3HR) cells. Similar results are obtained with the 6E1 antibody, suggesting that the synthesized hybrid can be widely applicable for NC-ADC using the antibody of interest. In summary, a series of evidence presented here strongly indicate that NC-ADCs have high potential for the next generation of antitumor agents.
尽管已经开发了几种制备抗体药物偶联物(ADC)的方法,但尚未有报道利用抗体结合肽(例如来自蛋白 A 的 Z33)作为生成非共价型 ADC(NC-ADC)的关键单元。 )。在此,我们的目标是通过合成 Z33 缀合的抗肿瘤药物普那布林来建立一种新型 NC-ADC 探针。由于疏水性普那布林和亲水性 Z33 两种组分的溶解度不同,需要采用固载二硫键偶联试剂的创新方法来合成具有显着效率(分离产率 29%)的目标化合物。我们证明,合成的杂交体在表面等离振子共振 (SPR) 中表现出针对抗 HER2 抗体(赫赛汀)和抗 CD71 抗体 (6E1) 的结合亲和力(Kd 分别为 46.6 ± 0.5 nM 和 4.5 ± 0.56 μM) ) 测定。在基于细胞的测定中,在赫赛汀存在的情况下,该杂交体对 HER2 过表达的 SKBR-3 细胞具有显着的细胞毒性,但对 HER2 低表达的 MCF-7 细胞没有显着的细胞毒性。此外,值得注意的是,与赫赛汀组合的杂合体可诱导针对赫赛汀耐药 SKBR-3 (SKBR-3HR) 细胞的细胞毒性。使用 6E1 抗体获得了类似的结果,表明合成的杂交体可以广泛适用于使用目标抗体的 NC-ADC。总之,这里提出的一系列证据强烈表明 NC-ADC 具有作为下一代抗肿瘤药物的巨大潜力。