CD8+ lymphocytes are critical for early control of tuberculosis in macaques
DownloadCaylin G. Winchell, Sarah K. Nyquist, Michael C. Chao, Pauline Maiello, Amy J. Myers, Forrest Hopkins, Michael Chase, Hannah P. Gideon, Kush V. Patel, Joshua D. Bromley, Andrew W. Simonson, Roisin Floyd-O’Sullivan, Marc Wadsworth, Jacob M. Rosenberg, Rockib Uddin, Travis Hughes, Ryan J. Kelly, Josephine Griffo, Jaime Tomko, Edwin Klein, Bonnie Berger, Charles A. Scanga, Joshua Mattila, Sarah M. Fortune, Alex K. Shalek, Philana Ling Lin, JoAnne L. Flynn; CD8+ lymphocytes are critical for early control of tuberculosis in macaques. J Exp Med 4 December 2023; 220 (12): e20230707. doi: https://doi.org/10.1084/jem.20230707
The functional role of CD8+ lymphocytes in tuberculosis remains poorly understood. We depleted innate and/or adaptive CD8+ lymphocytes in macaques and showed that loss of all CD8α+ cells (using anti-CD8α antibody) significantly impaired early control of Mycobacterium tuberculosis (Mtb) infection, leading to increased granulomas, lung inflammation, and bacterial burden. Analysis of barcoded Mtb from infected macaques demonstrated that depletion of all CD8+ lymphocytes allowed increased establishment of Mtb in lungs and dissemination within lungs and to lymph nodes, while depletion of only adaptive CD8+ T cells (with anti-CD8β antibody) worsened bacterial control in lymph nodes. Flow cytometry and single-cell RNA sequencing revealed polyfunctional cytotoxic CD8+ lymphocytes in control granulomas, while CD8-depleted animals were unexpectedly enriched in CD4 and γδ T cells adopting incomplete cytotoxic signatures. Ligand-receptor analyses identified IL-15 signaling in granulomas as a driver of cytotoxic T cells. These data support that CD8+ lymphocytes are required for early protection against Mtb and suggest polyfunctional cytotoxic responses as a vaccine target.
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Created at: 24th Oct 2023 at 19:34
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Created: 24th Oct 2023 at 19:34
