Phenylboronic-acid-based nanocomplex as a feasible delivery platform of immune checkpoint inhibitor for potent cancer immunotherapy.

Journal of Controlled Release : Official Journal of the Controlled Release Society
Junha LimWon Jong Kim

Abstract

Inspired by our previous study, we report a simple yet effective platform for therapeutic antibody delivery. A polymeric phenylboronic acid (pPBA)-antibody nanocomplex was simply formulated by mixing pPBA and antibody, derived by the formation of a pH-responsive phenylboronic ester between the PBA group on pPBA and diol on the inherent glycosylation site of the antibody. We focused on the basic prerequisites for a successful delivery, protection from degradation during the circulation, and release at the target lesion. To evaluate the antibody delivery system, anti-PD-L1, one of the most common antibody therapeutics in immuno-oncology, and mouse colon cancer model with an MC-38 cell line were used. Several in-vitro assays reveal the outstanding protective effect of the nanocomplexes as well as the pH-responsive release of antibodies. Moreover, the anti-PD-L1 nanocomplex exhibited an enhanced circulation as well as a better accumulation in tumor lesions after administration in vivo, which led to a significant antitumor effect in comparison to that of a free antibody. Our nanocomplex platform is a promising antibody delivery system for application in conventional antibody-mediated therapies.

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Jan 13, 2021·Journal of Controlled Release : Official Journal of the Controlled Release Society·Minsu KwonIn-San Kim

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