Abstract
Activation of the innate immune system via pattern recognition receptors (PRRs) is key to generate lasting adaptive immunity. PRRs detect unique chemical patterns associated with invading microorganisms, but whether and how the physical properties of PRR ligands influence the development of the immune response remains unknown. Through the study of fungal mannans, we show that the physical form of PRR ligands dictates the immune response. Soluble mannans are immunosilent in the periphery but elicit a potent pro-inflammatory response in the draining lymph node (dLN). By modulating the physical form of mannans, we developed a formulation that targets both the periphery and the dLN. When combined with viral glycoprotein antigens, this mannan formulation broadens epitope recognition, elicits potent antigen-specific neutralizing antibodies, and confers protection against viral infections of the lung. Thus, the physical properties of microbial ligands determine the outcome of the immune response and can be harnessed for vaccine development.
Keywords:
Dectin; PAMP; PRR; SARS-CoV-2; coronavirus; inflammation; influenza A virus; innate immunity; interferon; pathogen-associated molecular pattern; pattern recognition receptor; viral glycoprotein.
Copyright © 2022 Elsevier Inc. All rights reserved.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, N.I.H., Intramural
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Adjuvants, Immunologic / pharmacology*
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Aluminum Hydroxide / chemistry
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Animals
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Antibodies, Neutralizing / immunology
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Antibody Specificity / immunology
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Antigens, Viral / immunology*
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B-Lymphocytes / immunology
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COVID-19 / immunology
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COVID-19 / prevention & control
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COVID-19 / virology
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Candida albicans / chemistry*
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Chlorocebus aethiops
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Epitopes / immunology
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Immunity, Innate
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Immunization
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Inflammation / pathology
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Interferons / metabolism
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Lectins, C-Type / metabolism
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Ligands
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Lung / immunology
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Lung / pathology
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Lung / virology
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Lymph Nodes / immunology
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Lymph Nodes / metabolism
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Macrophages / metabolism
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Mannans / immunology*
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Mice
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Mice, Inbred C57BL
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Paranasal Sinuses / metabolism
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Protein Subunits / metabolism
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Sialic Acid Binding Ig-like Lectin 1 / metabolism
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Solubility
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Spike Glycoprotein, Coronavirus / metabolism
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T-Lymphocytes / immunology
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Transcription Factor RelB / metabolism
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Vero Cells
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beta-Glucans / metabolism
Substances
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Adjuvants, Immunologic
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Antibodies, Neutralizing
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Antigens, Viral
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Epitopes
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Lectins, C-Type
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Ligands
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Mannans
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Protein Subunits
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Relb protein, mouse
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Sialic Acid Binding Ig-like Lectin 1
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Spike Glycoprotein, Coronavirus
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beta-Glucans
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dectin-2, mouse
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spike protein, SARS-CoV-2
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Transcription Factor RelB
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Aluminum Hydroxide
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Interferons