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Uricase Inhibits Nitrogen Dioxide-Promoted Allergic Sensitization to Inhaled Ovalbumin Independent of Uric Acid Catabolism

Nitrogen dioxide (NO2) is an environmental air pollutant and endogenously generated oxidant that contributes to the exacerbation of respiratory disease and can function as an adjuvant to allergically sensitize to an innocuous inhaled Ag. Because uric acid has been implicated as a mediator of adjuvan...

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Published in:The Journal of immunology (1950) 2016-09, Vol.197 (5), p.1720-1732
Main Authors: Ather, Jennifer L, Burgess, Edward J, Hoyt, Laura R, Randall, Matthew J, Mandal, Mridul K, Matthews, Dwight E, Boyson, Jonathan E, Poynter, Matthew E
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cited_by cdi_FETCH-LOGICAL-c429t-8f3c16dcc94c91ee6d534c5e3e6f1a1b15f7d24d490c318cde1fa1ef7d3abfa33
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container_issue 5
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container_title The Journal of immunology (1950)
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creator Ather, Jennifer L
Burgess, Edward J
Hoyt, Laura R
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Mandal, Mridul K
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Boyson, Jonathan E
Poynter, Matthew E
description Nitrogen dioxide (NO2) is an environmental air pollutant and endogenously generated oxidant that contributes to the exacerbation of respiratory disease and can function as an adjuvant to allergically sensitize to an innocuous inhaled Ag. Because uric acid has been implicated as a mediator of adjuvant activity, we sought to determine whether uric acid was elevated and participated in a mouse model of NO2-promoted allergic sensitization. We found that uric acid was increased in the airways of mice exposed to NO2 and that administration of uricase inhibited the development of OVA-driven allergic airway disease subsequent to OVA challenge, as well as the generation of OVA-specific Abs. However, uricase was itself immunogenic, inducing a uricase-specific adaptive immune response that occurred even when the enzymatic activity of uricase had been inactivated. Inhibition of the OVA-specific response was not due to the capacity of uricase to inhibit the early steps of OVA uptake or processing and presentation by dendritic cells, but occurred at a later step that blocked OVA-specific CD4(+) T cell proliferation and cytokine production. Although blocking uric acid formation by allopurinol did not affect outcomes, administration of ultra-clean human serum albumin at protein concentrations equivalent to that of uricase inhibited NO2-promoted allergic airway disease. These results indicate that, although uric acid levels are elevated in the airways of NO2-exposed mice, the powerful inhibitory effect of uricase administration on allergic sensitization is mediated more through Ag-specific immune deviation than via suppression of allergic sensitization, a mechanism to be considered in the interpretation of results from other experimental systems.
doi_str_mv 10.4049/jimmunol.1600336
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Because uric acid has been implicated as a mediator of adjuvant activity, we sought to determine whether uric acid was elevated and participated in a mouse model of NO2-promoted allergic sensitization. We found that uric acid was increased in the airways of mice exposed to NO2 and that administration of uricase inhibited the development of OVA-driven allergic airway disease subsequent to OVA challenge, as well as the generation of OVA-specific Abs. However, uricase was itself immunogenic, inducing a uricase-specific adaptive immune response that occurred even when the enzymatic activity of uricase had been inactivated. Inhibition of the OVA-specific response was not due to the capacity of uricase to inhibit the early steps of OVA uptake or processing and presentation by dendritic cells, but occurred at a later step that blocked OVA-specific CD4(+) T cell proliferation and cytokine production. Although blocking uric acid formation by allopurinol did not affect outcomes, administration of ultra-clean human serum albumin at protein concentrations equivalent to that of uricase inhibited NO2-promoted allergic airway disease. These results indicate that, although uric acid levels are elevated in the airways of NO2-exposed mice, the powerful inhibitory effect of uricase administration on allergic sensitization is mediated more through Ag-specific immune deviation than via suppression of allergic sensitization, a mechanism to be considered in the interpretation of results from other experimental systems.</description><identifier>ISSN: 0022-1767</identifier><identifier>EISSN: 1550-6606</identifier><identifier>DOI: 10.4049/jimmunol.1600336</identifier><identifier>PMID: 27465529</identifier><language>eng</language><publisher>United States</publisher><subject><![CDATA[Adaptive Immunity ; Allergens - administration & dosage ; Allopurinol - administration & dosage ; Animals ; Antigen Presentation ; Asthma - chemically induced ; Asthma - immunology ; Asthma - prevention & control ; Cytokines - biosynthesis ; Cytokines - immunology ; Disease Models, Animal ; Humans ; Hypersensitivity - immunology ; Lung - chemistry ; Lung - immunology ; Lung - pathology ; Mice ; Mice, Inbred BALB C ; Nitrogen Dioxide - toxicity ; Ovalbumin - administration & dosage ; Ovalbumin - immunology ; Serum Albumin - administration & dosage ; Th2 Cells ; Urate Oxidase - administration & dosage ; Urate Oxidase - metabolism ; Uric Acid - metabolism]]></subject><ispartof>The Journal of immunology (1950), 2016-09, Vol.197 (5), p.1720-1732</ispartof><rights>Copyright © 2016 by The American Association of Immunologists, Inc.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c429t-8f3c16dcc94c91ee6d534c5e3e6f1a1b15f7d24d490c318cde1fa1ef7d3abfa33</citedby><cites>FETCH-LOGICAL-c429t-8f3c16dcc94c91ee6d534c5e3e6f1a1b15f7d24d490c318cde1fa1ef7d3abfa33</cites><orcidid>0000-0003-2715-6104 ; 0000-0003-2673-9148 ; 0000-0003-3840-8952</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,27924,27925</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/27465529$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Ather, Jennifer L</creatorcontrib><creatorcontrib>Burgess, Edward J</creatorcontrib><creatorcontrib>Hoyt, Laura R</creatorcontrib><creatorcontrib>Randall, Matthew J</creatorcontrib><creatorcontrib>Mandal, Mridul K</creatorcontrib><creatorcontrib>Matthews, Dwight E</creatorcontrib><creatorcontrib>Boyson, Jonathan E</creatorcontrib><creatorcontrib>Poynter, Matthew E</creatorcontrib><title>Uricase Inhibits Nitrogen Dioxide-Promoted Allergic Sensitization to Inhaled Ovalbumin Independent of Uric Acid Catabolism</title><title>The Journal of immunology (1950)</title><addtitle>J Immunol</addtitle><description>Nitrogen dioxide (NO2) is an environmental air pollutant and endogenously generated oxidant that contributes to the exacerbation of respiratory disease and can function as an adjuvant to allergically sensitize to an innocuous inhaled Ag. 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source Elektronische Zeitschriftenbibliothek
subjects Adaptive Immunity
Allergens - administration & dosage
Allopurinol - administration & dosage
Animals
Antigen Presentation
Asthma - chemically induced
Asthma - immunology
Asthma - prevention & control
Cytokines - biosynthesis
Cytokines - immunology
Disease Models, Animal
Humans
Hypersensitivity - immunology
Lung - chemistry
Lung - immunology
Lung - pathology
Mice
Mice, Inbred BALB C
Nitrogen Dioxide - toxicity
Ovalbumin - administration & dosage
Ovalbumin - immunology
Serum Albumin - administration & dosage
Th2 Cells
Urate Oxidase - administration & dosage
Urate Oxidase - metabolism
Uric Acid - metabolism
title Uricase Inhibits Nitrogen Dioxide-Promoted Allergic Sensitization to Inhaled Ovalbumin Independent of Uric Acid Catabolism
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