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Updated: Sep 15, 2025

Lymphocyte Isolation from Human Skin for Phenotypic Analysis and Ex Vivo Cell Culture
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IL-12 mRNA-LNP promotes dermal resident memory CD4+ T cell development.

Anabel Zabala-Peñafiel1, Claudia Gonzalez-Lombana1, Mohamad-Gabriel Alameh2

  • 1Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA.

NPJ Vaccines
|July 16, 2025
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Summary
This summary is machine-generated.

Interleukin-12 (IL-12) mRNA combined with a vaccine enhances CD4+ T cells in the skin (dTrm). This improves immunity against leishmaniasis and other skin infections.

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Area of Science:

  • Immunology
  • Vaccinology
  • Infectious Diseases

Background:

  • Dermal resident memory CD4+ T cells (dTrm) are crucial for protection against skin infections.
  • Factors influencing dTrm cell development are not fully understood.
  • mRNA vaccines show potential but require optimization for skin immunity.

Purpose of the Study:

  • To investigate if mRNA vaccination can induce dTrm cells.
  • To determine if combining IL-12 mRNA with a vaccine enhances dTrm development.
  • To assess the functional immunity conferred by IL-12-enhanced vaccination.

Main Methods:

  • mRNA vaccine encoding a leishmanial antigen was administered to mice.
  • IL-12 mRNA was co-administered with the vaccine in a separate group.
  • T cell populations, skin-homing markers, and memory markers were analyzed.
  • Delayed hypersensitivity responses and protection against Leishmania challenge were assessed.

Main Results:

  • Single mRNA vaccination induced systemic T cell responses but limited skin Trm cells.
  • IL-12 mRNA combined with the vaccine expanded Leishmania-specific Th1 cells in lymph nodes.
  • Enhanced vaccine strategy increased dTrm cell numbers in the skin.
  • Mice receiving the combination vaccine showed improved functional immunity and protection.

Conclusions:

  • IL-12 is a critical factor in promoting CD4+ dTrm cell development and skin seeding.
  • IL-12-enhanced mRNA vaccines can generate durable immunity against cutaneous leishmaniasis.
  • This approach holds promise for developing vaccines against other skin-targeted infections.