Platinum(II) as Bifunctional Linker in Antibody-Drug Conjugate Formation: Coupling of a 4-Nitrobenzo-2-oxa-1,3-diazole Fluorophore to Trastuzumab as a Model
作者:Dennis C. J. Waalboer、Joey A. Muns、Niels J. Sijbrandi、Richard B. M. Schasfoort、Rob Haselberg、Govert W. Somsen、Hendrik-Jan Houthoff、Guus A. M. S. van Dongen
DOI:10.1002/cmdc.201402496
日期:2015.5
The potential of platinum(II) as a bifunctional linker in the coordination of small molecules, such as imaging agents or (cytotoxic) drugs, to monoclonal antibodies (mAbs) was investigated with a 4‐nitrobenzo‐2‐oxa‐1,3‐diazole (NBD) fluorophore and trastuzumab (Herceptin™) as a model antibody. The effect of ligand and reaction conditions on conjugation efficiency was explored for [Pt(en)(L‐NBD)Cl](NO3)
用4-硝基苯并-2-氧杂-1,3-研究了铂(II)作为双功能接头在小分子(例如成像剂或(细胞毒性)药物)与单克隆抗体(mAb)协同作用中的潜力。二唑(NBD)荧光团和曲妥珠单抗(Herceptin™)作为模型抗体。研究了配体和反应条件对[Pt(en)(L-NBD)Cl](NO 3)(en =乙二胺),L = N-杂芳族,N-烷基胺或硫醚的结合效率的影响。在NaClO 4或Na 2 SO 4的存在下,在pH 8.0时,结合最有效地进行在tricine或HEPES缓冲液中。N-配位复合物(20当量)与曲妥珠单抗在37°C下反应2 h,然后除去带有过量硫脲的弱结合复合物,得到的NBD / mAb比为1.5-2.9的结合物在磷酸盐缓冲液中稳定在室温下用生理盐水冲洗至少48小时。相反,硫醚配位的配合物提供了不稳定的结合物。最后,表面等离子体共振分析显示缀合后曲妥珠单抗的结合亲和力没有损失。