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Ligand Nano-cluster Arrays in a Supported Lipid Bilayer

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Published on: April 23, 2017

Biocompatible Lipid Polymer Cationic Nanoparticles for Antigen Presentation.

Yunys Pérez-Betancourt¹, Bianca de Carvalho Lins Fernandes Távora², Eliana L Faquim-Mauro²

¹Biocolloids Laboratory, Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, Avenida Professor Lineu Prestes, 748 Butantan, São Paulo CEP 05508-000, Brazil.

|January 12, 2021

Summary

This summary is machine-generated.

Biocompatible lipid polymer nanoparticles (PMMA/DODAB/PDDA NPs) show promise as immuno-adjuvants. These nanoparticles enhance both humoral and cellular immune responses without cytotoxicity, demonstrating high biocompatibility and stability.

Keywords:

biocompatible polymer cationic lipid cationic nanoparticles toxicity cationic polymer humoral and cellular immune responses hybrid nanoparticles ovalbumin protein delivery vaccine adjuvants

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Area of Science:

Biomaterials Science
Immunology
Nanotechnology

Background:

Lipid polymer nanoparticles (NPs) have been utilized as antimicrobial agents.
Investigating novel applications for biocompatible NPs is crucial for advancing therapeutic strategies.

Purpose of the Study:

To explore the potential of Poly(methyl methacrylate)/dioctadecyldimethylammonium bromide/poly(diallyldimethylammonium chloride) (PMMA/DODAB/PDDA) nanoparticles (NPs) as immuno-adjuvants.
To characterize the immune response elicited by these NPs when combined with ovalbumin (OVA).

Main Methods:

NPs were synthesized via emulsion polymerization of methyl methacrylate (MMA) with DODAB and PDDA.
Dynamic light scattering was used for NP characterization (hydrodynamic diameter, zeta-potential, polydispersity).
Balb/c mice were immunized with NPs/OVA to assess humoral and cellular immune responses, including antibody production and cytokine profiles.

Main Results:

Characterization revealed NPs with a hydrodynamic diameter of 225 ± 2 nm, zeta-potential of 73 ± 1 mV, and low polydispersity (0.10 ± 0.01).
Ovalbumin adsorption reduced zeta-potential to 45 ± 2 mV.
Immunization induced enhanced OVA-specific IgG1 and IgG2a, moderate delayed type hypersensitivity, and increased cytokine production (IL-4, IL-10, IL-2, IFN-γ).
No cytotoxicity was observed in cultured macrophages and fibroblasts.

Conclusions:

PMMA/DODAB/PDDA NPs exhibit high biocompatibility, zeta-potential, colloidal stability, and antigen adsorption capabilities.
These NPs effectively stimulate both humoral and cellular antigen-specific immune responses.
The findings support the potential of these NPs as novel immuno-adjuvants for vaccine development.