标题：Modulating Targeting of Poly(ethylene glycol) Particles to Tumor Cells Using Bispecific Antibodies
作者：Cui, Jiwei; Ju, Yi; Houston, Zachary H.; Class, Joshua J.; Fletcher, Nicholas L.; Alcantara, Sheilajen; Dai, Qiong; Howard, Christopher 更多 作者机构：[Cui, Jiwei; Ju, Yi; Dai, Qiong; Caruso, Frank] Univ Melbourne, ARC Ctr Excellence Convergent Bionano Sci & Techn, Parkville, Vic 3010, Australia.; 更多
通讯作者：Caruso, F;Caruso, F;Thurecht, K;Thurecht, K;Thurecht, K;Kent, SJ;Kent, SJ
通讯作者地址：[Caruso, F]Univ Melbourne, ARC Ctr Excellence Convergent Bionano Sci & Techn, Parkville, Vic 3010, Australia;[Caruso, F]Univ Melbourne, Dept Chem Engn 更多
来源：ADVANCED HEALTHCARE MATERIALS
关键词：biodistribution; bispecific antibodies; cell targeting; mesoporous; silica particles; PEG particles
摘要：Low-fouling or stealth particles composed of poly(ethylene glycol) (PEG) display a striking ability to evade phagocytic cell uptake. However, functionalizing them for specific targeting is challenging. To address this challenge, stealth PEG particles prepared by a mesoporous silica templating method are functionalized with bispecific antibodies (BsAbs) to obtain PEG-BsAb particles via a one-step binding strategy for cell and tumor targeting. The dual specificity of the BsAbsone arm binds to the PEG particles while the other targets a cell antigen (epidermal growth factor receptor, EGFR)is exploited to modulate the number of targeting ligands per particle. Increasing the BsAb incubation concentration increases the amount of BsAb tethered to the PEG particles and enhances targeting and internalization into breast cancer cells overexpressing EGFR. The degree of BsAb functionalization does not significantly reduce the stealth properties of the PEG particles ex vivo, as assessed by their interactions with primary human blood granulocytes and monocytes. Although increasing the BsAb amount on PEG particles does not lead to the expected improvement in tumor accumulation in vivo, BsAb functionalization facilitates tumor cell uptake of PEG particles. This work highlights strategies to balance evading nonspecific clearance pathways, while improving tumor targeting and accumulation.