Physicochemical and biological characterization of nanovenoms, a new tool formed by silica nanoparticles and Crotalus durissus terrificus venom

BAUDOU, FEDERICO G.; FUSCO, L.; GIORGI, E.; DIAZ, M. E.; MUNICOY, S.; DESIMONE, M.; LEIVA, L.; DE MARZI, M.

COLLOIDS AND SURFACES B-BIOINTERFACES

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2020

0927-7765

Nanoparticles (NPs) are being studied due to their potential use as therapeutic and immunomodulatory tools,including their ability to transport antigens with the aim to induce a specific immune response. The productionof snake antivenoms (AV) involves several inoculations of venom (V) in the presence of adjuvants (ADJ) to improve the immune response of inoculated animals, causing a decrease in its quality and shelf life. Therefore, it isinteresting to develop new strategies for reduce these side effects. For that reason, associating V to NPs to replaceconventional ADJ could be a useful tool for future AV production. In this work, nanovenoms (NVs) were generated by the adsorption of Crotalus durissus terrificus (Cdt) V proteins over silica NPs (SiNPs) synthesized accordingto the Stöber method. Microphotographies obtained under Transmission Electron Microscopy (TEM) displayed aprotein crown over NPs and Fourier Transform Infrared (FT-IR) presented the expected spectra for NVs resultingfrom the sum of those exhibited by Cdt V and SiNPs separately. SDS PAGE and immunoblotting assays confirmedthe presence of proteins over SiNPs. Furthermore, the different enzymatic activities detected demonstrated thatSiNPs were capable of binding V proteins preserving its activity and therefore would keep its native structure. Inthe same way, the NVs conserve the potential cytotoxic effects present in the V as we observed when culturingTHP-1 cells with these complexes. This evidence allows us to infer that developed NVs could be used as a newplatform for the production of antisera or for immunomodulatory therapies.