SARS-Coronavirus Open Reading Frame-8b triggers intracellular stress pathways and activates NLRP3 inflammasomes
Identifieur interne : 000341 ( Pmc/Curation ); précédent : 000340; suivant : 000342SARS-Coronavirus Open Reading Frame-8b triggers intracellular stress pathways and activates NLRP3 inflammasomes
Auteurs : Chong-Shan Shi ; Neel R. Nabar ; Ning-Na Huang ; John H. KehrlSource :
- Cell Death Discovery [ 2058-7716 ] ; 2019.
Abstract
The SARS (severe acute respiratory syndrome) outbreak was caused by a coronavirus (CoV) named the SARS-CoV. SARS pathology is propagated both by direct cytotoxic effects of the virus and aberrant activation of the innate immune response. Here, we identify several mechanisms by which a SARS-CoV open reading frame (ORF) activates intracellular stress pathways and targets the innate immune response. We show that ORF8b forms insoluble intracellular aggregates dependent on a valine at residue 77. Aggregated ORF8b induces endoplasmic reticulum (ER) stress, lysosomal damage, and subsequent activation of the master regulator of the autophagy and lysosome machinery, Transcription factor EB (TFEB). ORF8b causes cell death in epithelial cells, which is partially rescued by reducing its ability to aggregate. In macrophages, ORF8b robustly activates the NLRP3 inflammasome by providing a potent signal 2 required for activation. Mechanistically, ORF8b interacts directly with the Leucine Rich Repeat domain of NLRP3 and localizes with NLRP3 and ASC in cytosolic dot-like structures. ORF8b triggers cell death consistent with pyroptotic cell death in macrophages. While in those cells lacking NLRP3 accumulating ORF8b cytosolic aggregates cause ER stress, mitochondrial dysfunction, and caspase-independent cell death.
Url:
DOI: 10.1038/s41420-019-0181-7
PubMed: 31231549
PubMed Central: 6549181
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<front><div type="abstract" xml:lang="en"><p id="Par1">The SARS (severe acute respiratory syndrome) outbreak was caused by a coronavirus (CoV) named the SARS-CoV. SARS pathology is propagated both by direct cytotoxic effects of the virus and aberrant activation of the innate immune response. Here, we identify several mechanisms by which a SARS-CoV open reading frame (ORF) activates intracellular stress pathways and targets the innate immune response. We show that ORF8b forms insoluble intracellular aggregates dependent on a valine at residue 77. Aggregated ORF8b induces endoplasmic reticulum (ER) stress, lysosomal damage, and subsequent activation of the master regulator of the autophagy and lysosome machinery, Transcription factor EB (TFEB). ORF8b causes cell death in epithelial cells, which is partially rescued by reducing its ability to aggregate. In macrophages, ORF8b robustly activates the NLRP3 inflammasome by providing a potent signal 2 required for activation. Mechanistically, ORF8b interacts directly with the Leucine Rich Repeat domain of NLRP3 and localizes with NLRP3 and ASC in cytosolic dot-like structures. ORF8b triggers cell death consistent with pyroptotic cell death in macrophages. While in those cells lacking NLRP3 accumulating ORF8b cytosolic aggregates cause ER stress, mitochondrial dysfunction, and caspase-independent cell death.</p>
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<front><journal-meta><journal-id journal-id-type="nlm-ta">Cell Death Discov</journal-id>
<journal-id journal-id-type="iso-abbrev">Cell Death Discov</journal-id>
<journal-title-group><journal-title>Cell Death Discovery</journal-title>
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<issn pub-type="epub">2058-7716</issn>
<publisher><publisher-name>Nature Publishing Group UK</publisher-name>
<publisher-loc>London</publisher-loc>
</publisher>
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<article-meta><article-id pub-id-type="pmid">31231549</article-id>
<article-id pub-id-type="pmc">6549181</article-id>
<article-id pub-id-type="publisher-id">181</article-id>
<article-id pub-id-type="doi">10.1038/s41420-019-0181-7</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>SARS-Coronavirus Open Reading Frame-8b triggers intracellular stress pathways and activates NLRP3 inflammasomes</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Shi</surname>
<given-names>Chong-Shan</given-names>
</name>
<xref ref-type="aff" rid="Aff1"></xref>
</contrib>
<contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">http://orcid.org/0000-0002-9704-3570</contrib-id>
<name><surname>Nabar</surname>
<given-names>Neel R.</given-names>
</name>
<address><phone>+301-443-6907</phone>
<email>neel.nabar@nih.gov</email>
</address>
<xref ref-type="aff" rid="Aff1"></xref>
</contrib>
<contrib contrib-type="author"><name><surname>Huang</surname>
<given-names>Ning-Na</given-names>
</name>
<xref ref-type="aff" rid="Aff1"></xref>
</contrib>
<contrib contrib-type="author" corresp="yes"><name><surname>Kehrl</surname>
<given-names>John H.</given-names>
</name>
<address><phone>+301-443-6907</phone>
<email>jkehrl@niaid.nih.gov</email>
</address>
<xref ref-type="aff" rid="Aff1"></xref>
</contrib>
<aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0001 2164 9667</institution-id>
<institution-id institution-id-type="GRID">grid.419681.3</institution-id>
<institution>B Cell Molecular Immunology Section, Laboratory of Immunoregulation,</institution>
<institution>National Institute of Allergy and Infectious Diseases, National Institutes of Health,</institution>
</institution-wrap>
Bethesda, MD 20892 USA</aff>
</contrib-group>
<pub-date pub-type="epub"><day>5</day>
<month>6</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="pmc-release"><day>5</day>
<month>6</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="collection"><year>2019</year>
</pub-date>
<volume>5</volume>
<elocation-id>101</elocation-id>
<history><date date-type="received"><day>20</day>
<month>3</month>
<year>2019</year>
</date>
<date date-type="rev-recd"><day>30</day>
<month>4</month>
<year>2019</year>
</date>
<date date-type="accepted"><day>13</day>
<month>5</month>
<year>2019</year>
</date>
</history>
<permissions><copyright-statement>© The Author(s) 2019</copyright-statement>
<license license-type="OpenAccess"><license-p><bold>Open Access</bold>
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">http://creativecommons.org/licenses/by/4.0/</ext-link>
.</license-p>
</license>
</permissions>
<abstract id="Abs1"><p id="Par1">The SARS (severe acute respiratory syndrome) outbreak was caused by a coronavirus (CoV) named the SARS-CoV. SARS pathology is propagated both by direct cytotoxic effects of the virus and aberrant activation of the innate immune response. Here, we identify several mechanisms by which a SARS-CoV open reading frame (ORF) activates intracellular stress pathways and targets the innate immune response. We show that ORF8b forms insoluble intracellular aggregates dependent on a valine at residue 77. Aggregated ORF8b induces endoplasmic reticulum (ER) stress, lysosomal damage, and subsequent activation of the master regulator of the autophagy and lysosome machinery, Transcription factor EB (TFEB). ORF8b causes cell death in epithelial cells, which is partially rescued by reducing its ability to aggregate. In macrophages, ORF8b robustly activates the NLRP3 inflammasome by providing a potent signal 2 required for activation. Mechanistically, ORF8b interacts directly with the Leucine Rich Repeat domain of NLRP3 and localizes with NLRP3 and ASC in cytosolic dot-like structures. ORF8b triggers cell death consistent with pyroptotic cell death in macrophages. While in those cells lacking NLRP3 accumulating ORF8b cytosolic aggregates cause ER stress, mitochondrial dysfunction, and caspase-independent cell death.</p>
</abstract>
<kwd-group kwd-group-type="npg-subject"><title>Subject terms</title>
<kwd>Cell death and immune response</kwd>
<kwd>Inflammasome</kwd>
</kwd-group>
<funding-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">https://doi.org/10.13039/100006492</institution-id>
<institution>Division of Intramural Research, National Institute of Allergy and Infectious Diseases (Division of Intramural Research of the NIAID)</institution>
</institution-wrap>
</funding-source>
<award-id>1ZIAAI000739-23</award-id>
<principal-award-recipient><name><surname>Kehrl</surname>
<given-names>John H.</given-names>
</name>
</principal-award-recipient>
</award-group>
</funding-group>
<custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name>
<meta-value>© The Author(s) 2019</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
</pmc>
</record>
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