Development of Anilino-Maytansinoid ADCs that Efficiently Release Cytotoxic Metabolites in Cancer Cells and Induce High Levels of Bystander Killing
作者:Wayne C. Widdison、Jose F. Ponte、Jennifer A. Coccia、Leanne Lanieri、Yulius Setiady、Ling Dong、Anna Skaletskaya、E. Erica Hong、Rui Wu、Qifeng Qiu、Rajeeva Singh、Paulin Salomon、Nathan Fishkin、Luke Harris、Erin K. Maloney、Yelena Kovtun、Karen Veale、Sharon D. Wilhelm、Charlene A. Audette、Juliet A. Costoplus、Ravi V. J. Chari
DOI:10.1021/acs.bioconjchem.5b00430
日期:2015.11.18
Antibody anilino maytansinoid conjugates (AaMCs) have been prepared in which a maytansinoid bearing an aniline group was linked through the aniline amine to a dipeptide, which in turn was covalently attached to a desired monoclonal antibody. Several such conjugates were prepared utilizing different dipeptides in the linkage including Gly-Gly, l-Val-l-Cit, and all four stereoisomers of the Ala-Ala dipeptide. The properties of AaMCs could be altered by the choice of dipeptide in the linker. Each of the AaMCs, except the AaMC bearing a d-Ala-d-Ala peptide linker, displayed more bystander killing in vitro than maytansinoid ADCs that utilize disulfide linkers. In mouse models, the anti-CanAg AaMC bearing a d-Ala-l-Ala dipeptide in the linker was shown to be more efficacious against heterogeneous HT-29 xenografts than maytansinoid ADCs that utilize disulfide linkers, while both types of the conjugates displayed similar tolerabilities.
抗体氨基氮杂丝氨霉素偶联物(AaMCs)已制备完成,其中一种含有苯胺基团的氮杂丝氨霉素通过苯胺胺键与二肽连接,该二肽又通过共价键与所需单克隆抗体相连。利用不同二肽(包括甘-甘、左旋缬-左旋瓜氨酸和丙氨酸-丙氨酸的四种立体异构体)制备了多种此类偶联物。通过选择连接子中的二肽,可以改变AaMCs的性质。除携带d-Ala-d-Ala肽链连接子的AaMC外,每种AaMC在体外均显示出比使用二硫键连接子的氮杂丝氨霉素ADC更高的旁观者杀伤效果。在小鼠模型中,携带d-Ala-l-Ala二肽连接子的抗CanAg AaMC在对抗异质性HT-29异种移植方面比使用二硫键连接子的氮杂丝氨霉素ADC更有效,而这两种偶联物显示出相似的耐受性。