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Vaccines are among the most effective tools in preventive medicine, designed to prepare the immune system to recognize and combat infectious agents. By introducing antigens—substances that the immune system identifies as foreign—vaccines stimulate an adaptive immune response that leads to immunological memory. This immunological memory enables the body to mount a faster and more effective response upon future exposures to the actual pathogen.Vaccines can be categorized based on the...
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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
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Programming systemic and mucosal immunity through co-adjuvant-based prime-boost vaccination.

Satoshi Uematsu1

  • 1Department of Immunology and Genomics, Graduate School of Medicine, Osaka Metropolitan University, 1-4-3 Asahi-machi, Abeno-ku, Osaka 545-8585, Japan; Division of Metagenome Medicine, Human Genome Center, The Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan.

Current Opinion in Virology
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New vaccine strategies use co-adjuvants during initial priming to program long-lasting mucosal immunity, enabling future adjuvant-free boosts. This approach enhances immune cell imprinting for robust mucosal IgA and tissue-resident responses.

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Area of Science:

  • Vaccinology
  • Immunology
  • Innate Immunity

Background:

  • Effective mucosal vaccine development is hindered by a lack of clinically validated mucosal adjuvants and poor understanding of immune coordination.
  • The initial vaccination priming phase critically influences the quality, durability, and location of immune responses.

Purpose of the Study:

  • To review emerging evidence on co-adjuvant-based priming strategies for establishing long-lasting immune programs.
  • To highlight how coordinated innate immune receptor activation during priming imprints immune cells for mucosal immunity.
  • To discuss translational advances and the principle that priming quality, not boosting, dictates mucosal immunity.

Main Methods:

  • Review of recent studies on co-adjuvant-based priming strategies.
  • Focus on the combination of CpG DNA and curdlan as a model system.
  • Discussion of translational studies in non-human primates using mRNA and protein-based vaccines.

Main Results:

  • Co-adjuvant priming can establish durable immune programs, allowing for adjuvant-free mucosal boosting.
  • Coordinated activation of innate immune receptors imprints dendritic cells, B cells, and T cells.
  • This immune programming paradigm is maintainable with clinically oriented formulations.

Conclusions:

  • Vaccine adjuvants can be redefined as tools for immune programming.
  • The quality of vaccination priming is the key determinant of successful mucosal immunity.
  • This provides a conceptual framework for designing next-generation vaccines.