Biodegradable Zwitterionic Poly(Carboxybetaine) Microgel for Sustained Delivery of Antibodies with Extended Stability and Preserved Function

Published

June 2, 2021

Author(s)

Amir Erfani, Abanoub Hanna, Payam Zarrintaj, Saeed Manouchehri, Katie Weigandt, Clint P. Aichele, Joshua D. Ramsey

Abstract

Many recent innovative treatments are based on monoclonal antibodies (mAbs) and other protein therapies. Nevertheless, sustained subcutaneous, oral or pulmonary delivery of such therapeutics are limited by the poor stability, short half-life, and non-specific interactions between the antibody (ab) and delivery vehicle. Protein stabilizers (osmolytes) such as carboxybetaine can prevent non-specific interactions within proteins. In this work, a biodegradable zwitterionic poly(carboxybetaine), pCB, based microgel covalently crosslinked with tetra(ethylene glycol) diacrylate (TTEGDA) was synthesized for Ab encapsulation. The resulting microgels were characterized via FTIR, diffusion NMR, small-angle neutron scattering (SANS), and cell culture studies. The microgels were found to contain up to 97.5% water content and showed excellent degradability that can be tuned with crosslinking density. Cell compatibility of the microgel was studied by assessing the toxicity and immunogenicity in vitro. Cells exposed to microgel showed complete viability and no pro-inflammatory secretion of interleukin 6 (IL6) or tumor necrosis factor-alpha (TNFα). Microgel was loaded with Immunoglobulin G (as a model Ab), using a post-fabrication loading technique, and Ab sustained release from microgels of varying crosslinking densities was studied. The released Abs (especially from the high crosslinked microgels) proved to be completely active and able to bind with Ab receptors. This study opens a new horizon for scientists to use such a platform for local delivery of Abs to the desired target with minimized nonspecific interactions.

Citation

Soft Matter

Volume

17

Issue

21

Pub Type

Journals

Keywords

Microgels, antibodies, polymers

Citation

Erfani, A. , Hanna, A. , Zarrintaj, P. , Manouchehri, S. , Weigandt, K. , Aichele, C. and Ramsey, J. (2021), Biodegradable Zwitterionic Poly(Carboxybetaine) Microgel for Sustained Delivery of Antibodies with Extended Stability and Preserved Function, Soft Matter (Accessed October 9, 2025)