Journal
PLOS PATHOGENS
Volume 14, Issue 10, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.ppat.1007358
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Funding
- National Institute of Allergy and Infectious Diseases (NIAID) of the National Institutes of Health (NIH) [2R01AI071752]
- National Institute of General Medical Sciences of the NIH [GM060655]
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R25GM060655, SC1GM100806] Funding Source: NIH RePORTER
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Development of vaccines against opportunistic infections is difficult as patients most at risk of developing disease are deficient in aspects of the adaptive immune system. Here, we utilized an experimental immunization strategy to induce innate memory in macrophages in vivo. Unlike current trained immunity models, we present an innate memory-like phenotype in macrophages that is maintained for at least 70 days post-immunization and results in complete protection against secondary challenge in the absence of adaptive immune cells. RNA-seq analysis of in vivo IFN-gamma primed macrophages revealed a rapid up-regulation of IFN-gamma and STAT1 signaling pathways following secondary challenge. The enhanced cytokine recall responses appeared to be pathogen-specific, dependent on changes in histone methylation and acetylation, and correlated with increased STAT1 binding to promoter regions of genes associated with protective anti-fungal immunity. Thus, we demonstrate an alternative mechanism to induce macrophage innate memory in vivo that facilitates pathogen-specific vaccine-mediated immune responses.
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