Antibody-conjugates with improved therapeutic index for targeting HER2 tumours and method for improving therapeutic index of antibody-conjugates
申请人:SYNAFFIX B.V.
公开号:US11338043B2
公开(公告)日:2022-05-24
The present invention concerns novel and improved antibody-conjugates for targeting HER2. The inventors found N that when antibody-conjugates were prepared using a specific mode of conjugation, they exhibit an improved therapeutic index. The mode of conjugation comprises a first step (i) of contacting a glycoprotein comprising 1-4 core N-acetylglucosamine moieties with a compound of the formula S(F1)x-P in the presence of a catalyst, wherein S(F1)x is a sugar derivative comprising x functional groups F1 capable of reacting with a functional group Q1, x is 1 or 2 and P is a nucleoside mono- or diphosphate, and wherein the catalyst is capable of transferring the S(F1)x moiety to the core-GlcNAc moiety, to obtain a modified antibody; and a second step (ii) of reacting the modified antibody with a linker-conjugate comprising a functional group Q1 capable of reacting with functional group F1 and a target molecule D connected to Q1 via a linker L2 to obtain the antibody-conjugate wherein linker L comprises S—Z3-L2 and wherein Z3 is a connecting group resulting from the reaction between Q1 and F1. The invention also relates to a use for improving the therapeutic index of an antibody-conjugate and to a method for targeting HER2-expressing cells.
本发明涉及用于靶向 HER2 的新型改良抗体共轭物。发明者发现,当抗体结合物采用特定的结合模式制备时,它们的治疗指数会有所提高。共轭模式包括第一步(i),在催化剂存在下,将包含 1-4 个核心 N-乙酰葡糖胺分子的糖蛋白与式 S(F1)x-P 的化合物接触、其中,S(F1)x 是包含 x 个官能团 F1 的糖衍生物,能与官能团 Q1 反应,x 是 1 或 2,P 是核苷单磷酸或二磷酸,催化剂能将 S(F1)x 基转移到核心-GlcNAc 基上,以获得修饰的抗体;第二步(ii)将修饰的抗体与连接体-共轭物反应,该连接体-共轭物包括能与官能团 F1 反应的官能团 Q1 和通过连接体 L2 与 Q1 连接的靶分子 D,从而得到抗体-共轭物,其中连接体 L 包括 S-Z3-L2,Z3 是 Q1 和 F1 反应产生的连接基团。本发明还涉及一种提高抗体轭合物治疗指数的用途和一种靶向 HER2 表达细胞的方法。