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CD4+ and CD8+ Circulating Memory T Cells Are Crucial in the Protection Induced by Vaccination with <i>Salmonella</i> Typhi Porins
oleh: Luis Ontiveros-Padilla, Alberto García-Lozano, Araceli Tepale-Segura, Tania Rivera-Hernández, Rodolfo Pastelin-Palacios, Armando Isibasi, Lourdes A. Arriaga-Pizano, Laura C. Bonifaz, Constantino López-Macías
Format: | Article |
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Diterbitkan: | MDPI AG 2021-04-01 |
Deskripsi
<i>Salmonella enterica</i> serovar Typhi (<i>S</i>. Typhi) porins, OmpC and OmpF, are potent inducers of the immune response against <i>S</i>. Typhi in mice and humans. Vaccination with porins induces the protection against 500 LD<sub>50</sub> of <i>S</i>. Typhi, life-lasting bactericidal antibodies and effector T cell responses in mice; however, the nature of the memory T cell compartment and its contribution to protection remains unknown. In this work, we firstly observed that vaccination with porins induces in situ (skin) CD4+ and CD8+ T cell responses. Analysis of the porin-specific functional responses of skin CD4+ and CD8+ T cells showed IFN-gamma- and IL-17-producing cells in both T cell populations. The memory phenotype of porin-specific T cells indicated the presence of resident and effector memory phenotypes in the skin, and a central memory phenotype in the skin-draining lymph node. In addition, we demonstrated that vaccination with porins via skin reduces the bacterial burden following challenge. Finally, evaluating the role of the circulating T cell memory population in protection, we showed that circulating memory CD4+ and CD8+ T cells are crucial in porin-mediated protection against <i>S</i>. Typhi. Overall, this study highlights the importance of inducing circulating memory T cell responses in order to achieve the optimal protection provided by porins, showing a mechanism that could be sought in the rational development of vaccines.