Efficient antigen cross-presentation through coating conventional aluminum adjuvant particles with PEI

Area of Science:

• Immunology
• Nanotechnology
• Vaccine Adjuvants

Background:

• Classical aluminum adjuvants are suboptimal carriers for antigen cross-presentation and CD8+ cytotoxic T cell priming.
• Covalent conjugation of antigens to α-Al2O3 nanoparticles previously enhanced cross-presentation efficiency.

Purpose of the Study:

• To investigate the effect of coating aluminum adjuvants with polyethyleneimine (PEI) on antigen cross-presentation.
• To evaluate the in vitro and in vivo efficacy of PEI-coated aluminum adjuvants in enhancing dendritic cell (DC) function.

Main Methods:

• Coating conventional aluminum adjuvants with polyethyleneimine (PEI).
• Assessing antigen cross-presentation by dendritic cells (DCs) in vitro.
• Evaluating the in vivo immune response following administration of PEI-coated adjuvants.

Main Results:

• Coating aluminum adjuvants with PEI significantly enhanced antigen cross-presentation by DCs.
• PEI demonstrated differential effects on the efficiency of antigen cross-presentation.
• The PEI-coated adjuvants showed improved performance both in vitro and in vivo.

Conclusions:

• Polyethyleneimine coating represents a viable strategy to improve the antigen-carrying capacity of aluminum adjuvants.
• This approach enhances DC-mediated antigen cross-presentation, crucial for effective CD8+ T cell responses.
• Findings support the rapid clinical translation of modified alumina nanoparticle adjuvants for vaccine applications.