Microbial cancer immunotherapy reprograms hematopoietic stem cells to enhance anti-tumor immunity
Daman, A. W.; Antonelli, A. C.; Redelman-Sidi, G.; Paddock, L.; Cheong, J. G.; Jurado, L. F.; Benjamin, A.; Jiang, S.; Ahimovic, D.; Khayat, S.; Bale, M. J.; Loutochin, O.; McPherson, V. A.; Pe'er, D.; Divangahi, M.; Pietzak, E.; Josefowicz, S. Z.; Glickman, M.
Show abstract
Mycobacterium bovis BCG is the vaccine against tuberculosis and an immunotherapy for bladder cancer. When administered intravenously, BCG reprograms bone marrow hematopoietic stem and progenitor cells (HSPCs), leading to heterologous protection against infections. Whether HSPC-reprogramming contributes to the anti-tumor effects of BCG administered into the bladder is unknown. We demonstrate that BCG administered in the bladder in both mice and humans reprograms HSPCs to amplify myelopoiesis and functionally enhance myeloid cell antigen presentation pathways. Reconstitution of naive mice with HSPCs from bladder BCG-treated mice enhances anti-tumor immunity and tumor control, increases intratumor dendritic cell infiltration, reprograms pro-tumorigenic neutrophils, and synergizes with checkpoint blockade. We conclude that bladder BCG acts systemically, reprogramming HSPC-encoded innate immunity, highlighting the broad potential of modulating HSPC phenotypes to improve tumor immunity. Graphical Abstract O_FIG O_LINKSMALLFIG WIDTH=199 HEIGHT=200 SRC="FIGDIR/small/586166v2_ufig1.gif" ALT="Figure 1"> View larger version (73K): org.highwire.dtl.DTLVardef@16b81a7org.highwire.dtl.DTLVardef@10cfebforg.highwire.dtl.DTLVardef@28bf93org.highwire.dtl.DTLVardef@1396184_HPS_FORMAT_FIGEXP M_FIG C_FIG
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