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Activation of Immune Responses Through the RIG-I Pathway Using TRITC-Dextran Encapsulated Nanoparticles.

Hayeon Baek1, Seung-Woo Yang2,3, Min-Kyung Kim1

  • 1Department of KONKUK-KIST Biomedical Science & Technology, Konkuk University, Seoul 05029, Korea.

Immune Network
|January 13, 2025
PubMed
Summary

Novel nanoparticles mimicking pathogen-associated molecular patterns (PAMPs) were developed. TRITC-dextran encapsulated nanoparticles specifically activated the RIG-I pathway, showing potential as broad-spectrum antiviral and anticancer agents.

Keywords:
Interferon-alphaNanoparticlesPathogen-associated molecular patternPathogen-associated molecular pattern moleculesReceptors, pattern recognitionRetinoic acid-inducible gene I

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Area of Science:

  • Immunology
  • Nanotechnology
  • Vaccine Development

Background:

  • Pathogen-associated molecular patterns (PAMPs) are microbial motifs recognized by pattern recognition receptors (PRRs), crucial for pathogen defense.
  • PAMP-mimicking vaccines offer potential for potent immune activation and broad-spectrum microbial protection.
  • Dextran encapsulation modifies nanoparticle (NP) surface characteristics.

Purpose of the Study:

  • To investigate dextran-encapsulated NPs as potential antiviral vaccines by mimicking viral PAMPs.
  • To explore the ability of dextran-encapsulated NPs to activate innate immunity via PRRs.
  • To determine the specific PRR targeted and the signaling pathway involved.

Main Methods:

  • Synthesis of basic NPs via cyclohexane inverse miniemulsion.
  • Encapsulation of NPs with dextran or TRITC-dextran (Dex-NPs, TDex-NPs).
  • In vitro (RAW 264.7 cells) and in vivo (C57BL/6 mice) experiments assessing PRR activation, IFN-α production, and signaling pathways (ERK/NF-κB).

Main Results:

  • Only TDex-NPs rapidly increased and directly bound to retinoic acid-inducible gene I (RIG-I) within 8 hours.
  • TDex-NPs induced 120-300 pg/ml of IFN-α production via the ERK/NF-κB pathway in both in vitro and in vivo models.
  • Therapeutic effects in mice were observed exclusively with footpad injections of TDex-NPs.

Conclusions:

  • TRITC-dextran encapsulated NPs possess surface properties enabling direct RIG-I binding.
  • These NPs show potential for development as novel antiviral and anticancer RIG-I agonists.
  • The findings highlight a new strategy for vaccine development using PAMP-mimicking nanoparticles.