Summary |
Antibody (Ab)-conjugated mPEG-NPs display improved specific targeting and therapeutic efficacy toward tumors as compared to untargeted NPs. However, covalent chemical modification of Ab/ligands to PEG-NPs often leads to heterogeneous orientation of Ab/ligands and difficulty in obtaining a reproducible product. Here, we developed humanized bispecific antibodies (anti-mPEG Fab+anti-tumor marker scFv) (BsAbs) which can simultaneously bind the terminal methoxy end of mPEG and tumor markers. The BsAbs can non-covalent modify the terminal ends of mPEG on the surface of mPEG-NPs and confer tumor specificity to mPEG-NPs. We also anticipate that this one-step method can facilitate development of multiplex bsAbs possessing different tumor marker tropism, such as against EGFR, HER2, CD20, CD19, and CD22 to allow customized therapy depending on the tumor markers displayed on the cancer of each patient. The bsAbs of the invention will accelerate the clinical applications of PEG-NPs. |