Multi-antigen spherical nucleic acid cancer vaccines

Area of Science:

• Immunology
• Nanotechnology
• Oncology

Background:

• Effective cancer vaccines necessitate the activation of diverse immune cell populations to combat aggressive tumors.
• The structural presentation of antigenic peptides is crucial for modulating immune responses.

Purpose of the Study:

• To investigate how the spatial arrangement and placement of two distinct antigenic peptides on spherical nucleic acid (SNA) nanoparticles influence immune responses.
• To determine the impact of dual-antigen SNA structure on antigen processing, cytokine production, and memory induction.

Main Methods:

• Utilized spherical nucleic acid (SNA) nanoparticles to present single and dual antigens.
• Analyzed transcriptomic, cellular, and organismal immune responses in mouse models.
• Assessed T cell activation, proliferation, gene expression, and tumor growth dynamics.

Main Results:

• A single dual-antigen SNA significantly increased antigen-specific T cell activation (30%) and proliferation (two-fold) compared to single-antigen SNAs.
• Specific antigen placement on dual-antigen SNAs modulated T cell gene expression and suppressed lymphoma tumor growth in mice.
• Dual-antigen SNAs combined with anti-programmed-cell-death protein-1 therapy reduced melanoma tumor growth and increased circulating memory T cells.

Conclusions:

• The structural design and antigen arrangement within multi-antigen vaccines, particularly dual-antigen SNAs, substantially impact their efficacy.
• Optimizing the presentation of multiple antigens on nanostructures can enhance anti-tumor immunity and therapeutic outcomes.