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A Metal-Phenolic Network-Enabled Nanoadjuvant to Modulate Immune Responses.

Zhaoran Wang1, Christina Cortez-Jugo1, Yang Yang2

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Summary

This study developed a novel nanoadjuvant using aluminosilicate nanoparticles, cytosine-phosphate-guanosine (CpG) oligonucleotides, and small-interfering RNA (siRNA). This advanced vaccine delivery system enhances immune responses and shows promise for disease prevention and therapeutics.

Keywords:
RNA interferenceimmunosuppressive pathwaysmetal–phenolic networksnanoadjuvants

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Area of Science:

  • Biotechnology
  • Immunology
  • Materials Science

Background:

  • Hierarchical suppressive immune pathways and inefficient delivery of vaccine components to antigen-presenting cells (APCs) hinder vaccine development.
  • Existing vaccine adjuvants and delivery systems face challenges in overcoming immune suppression and ensuring targeted delivery.

Purpose of the Study:

  • To engineer a novel nanoadjuvant using aluminosilicate nanoparticles, CpG oligonucleotides, and siRNA to overcome immune suppression in APCs.
  • To evaluate the stability and immune function of the nanoadjuvant, enhanced with a metal-phenolic network (MPN) coating, in vitro and in vivo.
  • To assess the nanoadjuvant's capacity for antigen delivery and its potential in triggering antigen-specific immune responses.

Main Methods:

  • Fabrication of nanoadjuvants using aluminosilicate nanoparticles as templates, incorporating CpG oligonucleotides and siRNA.
  • Application of a metal-phenolic network (MPN) coating for nanoparticle protection and bioadhesion.
  • In vitro and in vivo assessment of nanoadjuvant stability, immune cell maturation, lymph node accumulation, and antigen-specific responses using ovalbumin as a model antigen.

Main Results:

  • The developed nanoadjuvant demonstrated enhanced accumulation in lymph nodes and improved dendritic cell maturation compared to formulations lacking siRNA or MPN coating.
  • The MPN coating effectively loaded functional biomolecules, such as the model antigen ovalbumin.
  • The nanoadjuvant formulation showed no observable organ toxicity in vivo.
  • Enhanced antigen-specific immune responses were triggered by the nanoadjuvant carrying ovalbumin.

Conclusions:

  • The template-assisted fabrication strategy for nanoadjuvants, incorporating CpG, siRNA, and MPN coating, effectively counteracts immune suppression and enhances vaccine efficacy.
  • This nanoadjuvant design shows significant potential for improving vaccine delivery systems for disease prevention and therapeutic applications.
  • The study highlights a promising approach for engineering advanced nanodelivery systems with enhanced immunomodulatory and antigen-carrying capabilities.