Enhancing Immune Responses Through Modulation of Innate Cell Microenvironments in Lymph Nodes with Virus-Mimetic...

Area of Science:

• Vaccinology
• Nanotechnology
• Immunology

Background:

• Nanovaccines show promise but often struggle with insufficient innate and adaptive immune stimulation.
• Effective nanovaccine design requires strategies to enhance immune cell activation and coordination.

Purpose of the Study:

• To develop a versatile nanovaccine platform, termed virus-mimetic vaccines (VMVs), for enhanced immune response generation.
• To investigate VMVs' ability to modulate innate cell microenvironments within lymph nodes (LNs) for improved vaccine efficacy.

Main Methods:

• Developed VMVs by assembling polyarginine-tagged antigens onto nucleic acid nanogels containing cytosine-phosphate-guanine oligodeoxynucleotide.
• Utilized a salt-bridge zipper mechanism for noncovalent assembly and Toll-like receptor 9 activation.
• Administered VMVs via intramuscular immunization and analyzed innate cell recruitment, activation, and relocation within LNs.

Main Results:

• VMVs effectively recruited and activated diverse innate immune cells (DCs, macrophages, neutrophils) within LNs.
• Innate cell activation led to modulation of the LN microenvironment and optimized antigen-presenting cell function.
• Induced robust antigen-specific immune responses, including high neutralizing antibodies, memory T cell activity, and germinal center B cell development.

Conclusions:

• VMVs represent a rational vaccine strategy for dynamic modulation of innate cell microenvironments.
• This approach optimizes the generation of both humoral and cellular immunity against infectious diseases.
• VMVs offer a promising platform for developing next-generation nanovaccines.