Abstract
There is a growing appreciation for the importance of the gut microbiota as a therapeutic target in various diseases. However, there are only a handful of known commensal strains that can potentially be used to manipulate host physiological functions. Here we isolate a consortium of 11 bacterial strains from healthy human donor faeces that is capable of robustly inducing interferon-γ-producing CD8 T cells in the intestine. These 11 strains act together to mediate the induction without causing inflammation in a manner that is dependent on CD103+ dendritic cells and major histocompatibility (MHC) class Ia molecules. Colonization of mice with the 11-strain mixture enhances both host resistance against Listeria monocytogenes infection and the therapeutic efficacy of immune checkpoint inhibitors in syngeneic tumour models. The 11 strains primarily represent rare, low-abundance components of the human microbiome, and thus have great potential as broadly effective biotherapeutics.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Adenocarcinoma / immunology*
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Adenocarcinoma / pathology
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Adenocarcinoma / therapy*
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Animals
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Antigens, CD / metabolism
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Bacteria / classification*
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Bacteria / immunology
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Bacteria / isolation & purification
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CD8-Positive T-Lymphocytes / cytology
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CD8-Positive T-Lymphocytes / immunology*
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Cell Line, Tumor
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Dendritic Cells / immunology
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Feces / microbiology
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Female
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Gastrointestinal Microbiome / immunology*
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Healthy Volunteers
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Histocompatibility Antigens Class I / immunology
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Humans
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Integrin alpha Chains / metabolism
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Interferon-gamma / biosynthesis
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Interferon-gamma / immunology
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Listeria monocytogenes / immunology
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Listeriosis / immunology
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Listeriosis / microbiology
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Listeriosis / prevention & control*
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Male
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Mice
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Programmed Cell Death 1 Receptor / antagonists & inhibitors
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Programmed Cell Death 1 Receptor / immunology
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Symbiosis / immunology*
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Xenograft Model Antitumor Assays
Substances
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Antigens, CD
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Histocompatibility Antigens Class I
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Integrin alpha Chains
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Programmed Cell Death 1 Receptor
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alpha E integrins
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Interferon-gamma