Immunoadjuvant activity of the nanoparticles' surface modified with mannan

Area of Science:

• Nanotechnology
• Immunology
• Biomaterials

Background:

• Mannan (MN) is a natural ligand for mannose receptors found on dendritic cells (DCs).
• Poly(D,L-lactide-co-glycolide) (PLGA) nanoparticles (NPs) are utilized in drug delivery and vaccine development.
• DC maturation is crucial for initiating adaptive immune responses.

Purpose of the Study:

• To evaluate how formulation parameters affect the immunogenicity of MN-decorated PLGA NPs.
• To assess the impact of MN incorporation methods on DC phenotypic and functional maturation.
• To optimize PLGA NP formulations for enhanced immune stimulation.

Main Methods:

• Formulation of PLGA NPs using ester-terminated or COOH-terminated PLGA.
• Incorporation of MN via encapsulation, adsorption, or chemical conjugation.
• Treatment of murine bone marrow-derived DCs (BMDCs) with various NP formulations.
• Assessment of DC maturation markers, cytokine secretion, and T cell activation.

Main Results:

• COOH-terminated PLGA NPs with chemically conjugated MN (MN-Cov-COOH) demonstrated superior DC maturation and function.
• Higher MN incorporation levels in MN-Cov-COOH likely contributed to enhanced immunogenicity.
• Chemical conjugation of MN to PLGA NPs significantly improved DC stimulatory capacity.

Conclusions:

• Chemical conjugation of mannan to PLGA nanoparticles is an effective strategy for enhancing DC maturation.
• Optimized PLGA NP formulations can lead to improved vaccine immunogenicity.
• This approach holds potential for the development of novel and effective PLGA-based vaccine delivery systems.