CD4 TÂ cells re-wire granuloma cellularity and regulatory networks to promote immunomodulation following Mtb reinfection.
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Abstract | Immunological priming-in the context of either prior infection or vaccination-elicits protective responses against subsequent Mycobacterium tuberculosis (Mtb) infection. However, the changes that occur in the lung cellular milieu post-primary Mtb infection and their contributions to protection upon reinfection remain poorly understood. Using clinical and microbiological endpoints in a non-human primate reinfection model, we demonstrated that prior Mtb infection elicited a long-lasting protective response against subsequent Mtb exposure and was CD4 T cell dependent. By analyzing data from primary infection, reinfection, and reinfection-CD4 T cell-depleted granulomas, we found that the presence of CD4 T cells during reinfection resulted in a less inflammatory lung milieu characterized by reprogrammed CD8 T cells, reduced neutrophilia, and blunted type 1 immune signaling among myeloid cells. These results open avenues for developing vaccines and therapeutics that not only target lymphocytes but also modulate innate immune cells to limit tuberculosis (TB) disease. |
Year of Publication | 2024
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Journal | Immunity
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Date Published | 08/2024
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ISSN | 1097-4180
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DOI | 10.1016/j.immuni.2024.08.002
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PubMed ID | 39214090
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