Antibody-drug conjugates (ADCs) are targeted therapies, mainly used in oncology, consisting in a three-component molecular architecture combining a highly potent drug conjugated via a linker onto a monoclonal antibody (mAb), designed for the selective delivery of the drug to the tumor site. The linker is a key component, defining the ADC stability and mechanism of action, and particularly the drug release strategy
抗体-药物偶联物 (ADC) 是靶向治疗,主要用于肿瘤学,由三组分分子结构组成,结合通过单克隆抗体 (mAb) 上的接头,设计用于将药物选择性递送至肿瘤部位。接头是一个关键组件,它定义了 ADC 的稳定性和作用机制,尤其是药物释放策略。在这项研究中,我们开发并合成了一种可切割的接头,该接头具有对在肿瘤微环境中过表达的人中性粒细胞弹性蛋白酶 (HNE) 敏感的 Asn-Pro-Val (NPV) 序列。该接头允许使用二硫键重桥技术将细胞渗透性药物单甲基 auristatin E (MMAE) 与曲妥珠单抗进行位点特异性结合。然后在体外评估得到的 ADC. 该偶联物显示出保留的抗原 (Ag) 结合亲和力,并在内化后对 Ag 阳性肿瘤细胞表现出高亚纳摩尔效力,表明接头切割的细胞内机制。虽然在经典条件下在 Ag 阴性细胞上没有观察到该 ADC 的内化和细胞毒活性,但外源 HNE 的补充允许在这些细
Functional native disulfide bridging enables delivery of a potent, stable and targeted antibody–drug conjugate (ADC)
作者:João P. M. Nunes、Maurício Morais、Vessela Vassileva、Eifion Robinson、Vineeth S. Rajkumar、Mark E. B. Smith、R. Barbara Pedley、Stephen Caddick、James R. Baker、Vijay Chudasama
DOI:10.1039/c5cc03557k
日期:——
A next generation maleimide–ADC is shown to have excellent stability in blood serum, as well as high potency and selectivity in vitro.
一种下一代马来酰亚胺-ADC在血清中表现出优异的稳定性,以及高效性和选择性 vitro。
Chemical Modification of Antibodies
申请人:UCL Business PLC
公开号:US20150031861A1
公开(公告)日:2015-01-29
The present invention relates to antibodies and antibody fragments, one or more of whose native inter-chain disulfide bridges have been replaced with a specific bridging moiety. The bridging moiety can be selectively targeted to inter-chain disulfide bonds within the antibody or antibody fragment, enabling the construction of more homogenously modified products such as antibody-drug conjugates.
Herein we describe the synthesis and evaluation of four novel HER2-targeting, cathepsin B-sensitive antibody–drug conjugates bearing a monomethylauristatin E (MMAE) cytotoxic payload, constructed via the conjugation of cleavable linkers to trastuzumab using a site-specific bioconjugation methodology. These linkers vary by both cleavable trigger motif and hydrophilicity, containing one of two cathepsin
Antibody-drug conjugates (ADC) are spearheading vectorized chemotherapy against cancer, with 4 FDA-approved ADCs and 79 in clinical trials. However, most ADCs are produced using a stochastic bioconjugation method, target hematological cancers, and are derived from a full immunoglobulin-G (IgG). These factors limit their efficacy, especially against solid tumors which remain difficult to treat. Here we report the site-specific conjugation of a single auristatin derivative onto an engineered anti-HER2 single chain fragment variable (scFv) of the trastuzumab antibody, generating new scFv-drug conjugates (SDC). Two cysteines were judiciously incorporated at the beginning of the scFv hexahistidine tag, in order to allow controlled bioconjugation of a heterobifunctional linker including a second generation maleimide (SGM), either cleavable (for monomethyl auristatin E) or noncleavable (for monomethyl auristatin F). Our data indicated that both SDCs conserved their affinity to HER2 in comparison to the native scFv, and were efficiently able to kill in vitro HER2-positive SK-BR-3 cells at subnanomolar concentrations (EC50 of 0.68 nM and 0.32 nM). No effect was observed on HER2-negative MCF-7 cells. Ours results showed efficient targeting of site-specific SDCs against HER2-positive breast cancer cells. This work represents a first important step in the design of more effective small conjugates, paving the way for future in vivo translation to evaluate their full potential.