Antibody-mediated trapping in biological hydrogels is governed by sugar-sugar hydrogen bonds.

Acta Biomaterialia
Jennifer L SchillerSamuel K Lai

Abstract

N-glycans on IgG and IgM antibodies (Ab) facilitate Ab-mediated crosslinking of viruses and nanoparticles to the major structural elements of mucus and basement membranes. Nevertheless, the chemical moieties in these biological hydrogel matrices to which Ab can bind remain poorly understood. To gain insights into the chemistries that support Ab-matrix interactions, we systematically evaluated IgG- and IgM-mediated trapping of nanoparticles in different polysaccharide-based biogels with unique chemical features. In agarose, composed of alternating d-galactose and 3,6-anhydro-l-galactopyranose (i.e. hydroxyl groups only), anti-PEG IgM but not anti-PEG IgG trapped PEGylated nanoparticles. In alginate, comprised of homopolymeric blocks of mannuronate and guluronate (i.e. both hydroxyl and carboxyl groups), both IgG and IgM trapped PEGylated nanoparticles. In contrast, chitosan, comprised primarily of glucosamine (i.e. both hydroxyl and primary amine groups), did not facilitate either IgG- or IgM-mediated trapping. IgG-mediated trapping in alginate was abrogated upon removal of IgG N-glycans, whereas IgM-mediated trapping was eliminated in agarose but not alginate upon desialylation. These results led us to propose a model in which ...Continue Reading

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Citations

Nov 22, 2020·Expert Opinion on Drug Delivery·Daiqin ChenJung Soo Suk
Jul 15, 2021·Human Vaccines & Immunotherapeutics·Kevin J Whaley, Larry Zeitlin
Jul 28, 2021·Human Vaccines & Immunotherapeutics·Alison Schaefer, Samuel K Lai

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