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Mucosal Vaccine Development: From Adjuvant Design to Next-Generation Delivery Strategies.

Wook-Heon Lee1, Eunsoo Kim1

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This summary is machine-generated.

Developing effective mucosal vaccines is crucial for preventing pathogen entry. This review explores advances in mucosal immunity, delivery methods, and adjuvants to improve vaccine strategies against respiratory and gut infections.

Keywords:
intranasal immunizationmucosal adjuvantmucosal vaccineneedle-free vaccinesecretory IgAsublingual vaccination

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Area of Science:

  • Immunology
  • Vaccinology
  • Microbiology

Background:

  • Infectious pathogens often enter hosts via mucosal surfaces, necessitating localized immunity.
  • Conventional vaccines primarily induce systemic immunity, failing to generate robust mucosal secretory immunoglobulin A (SIgA).
  • The COVID-19 pandemic underscored the limitations of intramuscular vaccines in establishing durable respiratory mucosal immunity.

Purpose of the Study:

  • To review recent advancements in mucosal vaccine development.
  • To discuss the components and strategies for eliciting effective mucosal immune responses.
  • To identify challenges and future directions in mucosal vaccine research.

Main Methods:

  • Review of the mucosal immune system, including SIgA, tissue-resident memory T (TRM), and resident memory B (BRM) cells.
  • Examination of various mucosal adjuvants (e.g., STING agonists, modified enterotoxins) and delivery routes (intranasal, oral, sublingual).
  • Analysis of vaccine platforms (viral vectors, nanoparticles, mRNA-LNP, VLPs, bacterial platforms) and influencing factors (innate cells, T helper subsets, microbiota).

Main Results:

  • Recent progress includes novel adjuvants like STING agonists and strategies to enhance existing ones.
  • Diverse delivery systems, including nanoparticles and mRNA-lipid nanoparticles, show promise for mucosal immunization.
  • Understanding the roles of innate immunity, T cell subsets, and the microbiota is key to optimizing mucosal vaccine responses.

Conclusions:

  • Significant progress has been made in mucosal vaccine development, addressing limitations of traditional vaccines.
  • Overcoming barriers such as the lack of validated correlates of protection is essential for clinical translation.
  • Future research should focus on thermostable formulations and systems biology approaches for rational vaccine design.