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Activation of c-jun N-terminal kinase upon influenza A virus (IAV) infection is independent of pathogen-related receptors but dependent on amino acid sequence variations of IAV NS1.

Identifieur interne : 000F61 ( Main/Exploration ); précédent : 000F60; suivant : 000F62

Activation of c-jun N-terminal kinase upon influenza A virus (IAV) infection is independent of pathogen-related receptors but dependent on amino acid sequence variations of IAV NS1.

Auteurs : Wolfgang Nacken [Allemagne] ; Darisuren Anhlan [Allemagne] ; Eike R. Hrincius [Allemagne] ; Ahmed Mostafa [Égypte] ; Thorsten Wolff [Allemagne] ; Anne Sadewasser [Allemagne] ; Stephan Pleschka [Allemagne] ; Christina Ehrhardt [Allemagne] ; Stephan Ludwig [Allemagne]

Source :

RBID : pubmed:24872593

Descripteurs français

English descriptors

Abstract

A hallmark cell response to influenza A virus (IAV) infections is the phosphorylation and activation of c-jun N-terminal kinase (JNK). However, so far it is not fully clear which molecules are involved in the activation of JNK upon IAV infection. Here, we report that the transfection of influenza viral-RNA induces JNK in a retinoic acid-inducible gene I (RIG-I)-dependent manner. However, neither RIG-I-like receptors nor MyD88-dependent Toll-like receptors were found to be involved in the activation of JNK upon IAV infection. Viral JNK activation may be blocked by addition of cycloheximide and heat shock protein inhibitors during infection, suggesting that the expression of an IAV-encoded protein is responsible for JNK activation. Indeed, the overexpression of nonstructural protein 1 (NS1) of certain IAV subtypes activated JNK, whereas those of some other subtypes failed to activate JNK. Site-directed mutagenesis experiments using NS1 of the IAV H7N7, H5N1, and H3N2 subtypes identified the amino acid residue phenylalanine (F) at position 103 to be decisive for JNK activation. Cleavage- and polyadenylation-specific factor 30 (CPSF30), whose binding to NS1 is stabilized by the amino acids F103 and M106, is not involved in JNK activation. Conclusively, subtype-specific sequence variations in the IAV NS1 protein result in subtype-specific differences in JNK signaling upon IAV infection.

DOI: 10.1128/JVI.00424-14
PubMed: 24872593


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<front>
<div type="abstract" xml:lang="en">A hallmark cell response to influenza A virus (IAV) infections is the phosphorylation and activation of c-jun N-terminal kinase (JNK). However, so far it is not fully clear which molecules are involved in the activation of JNK upon IAV infection. Here, we report that the transfection of influenza viral-RNA induces JNK in a retinoic acid-inducible gene I (RIG-I)-dependent manner. However, neither RIG-I-like receptors nor MyD88-dependent Toll-like receptors were found to be involved in the activation of JNK upon IAV infection. Viral JNK activation may be blocked by addition of cycloheximide and heat shock protein inhibitors during infection, suggesting that the expression of an IAV-encoded protein is responsible for JNK activation. Indeed, the overexpression of nonstructural protein 1 (NS1) of certain IAV subtypes activated JNK, whereas those of some other subtypes failed to activate JNK. Site-directed mutagenesis experiments using NS1 of the IAV H7N7, H5N1, and H3N2 subtypes identified the amino acid residue phenylalanine (F) at position 103 to be decisive for JNK activation. Cleavage- and polyadenylation-specific factor 30 (CPSF30), whose binding to NS1 is stabilized by the amino acids F103 and M106, is not involved in JNK activation. Conclusively, subtype-specific sequence variations in the IAV NS1 protein result in subtype-specific differences in JNK signaling upon IAV infection.</div>
</front>
</TEI>
<affiliations>
<list>
<country>
<li>Allemagne</li>
<li>Égypte</li>
</country>
<region>
<li>Berlin</li>
<li>District de Münster</li>
<li>Rhénanie-du-Nord-Westphalie</li>
</region>
<settlement>
<li>Berlin</li>
<li>Münster</li>
</settlement>
</list>
<tree>
<country name="Allemagne">
<region name="Rhénanie-du-Nord-Westphalie">
<name sortKey="Nacken, Wolfgang" sort="Nacken, Wolfgang" uniqKey="Nacken W" first="Wolfgang" last="Nacken">Wolfgang Nacken</name>
</region>
<name sortKey="Anhlan, Darisuren" sort="Anhlan, Darisuren" uniqKey="Anhlan D" first="Darisuren" last="Anhlan">Darisuren Anhlan</name>
<name sortKey="Ehrhardt, Christina" sort="Ehrhardt, Christina" uniqKey="Ehrhardt C" first="Christina" last="Ehrhardt">Christina Ehrhardt</name>
<name sortKey="Hrincius, Eike R" sort="Hrincius, Eike R" uniqKey="Hrincius E" first="Eike R" last="Hrincius">Eike R. Hrincius</name>
<name sortKey="Ludwig, Stephan" sort="Ludwig, Stephan" uniqKey="Ludwig S" first="Stephan" last="Ludwig">Stephan Ludwig</name>
<name sortKey="Pleschka, Stephan" sort="Pleschka, Stephan" uniqKey="Pleschka S" first="Stephan" last="Pleschka">Stephan Pleschka</name>
<name sortKey="Sadewasser, Anne" sort="Sadewasser, Anne" uniqKey="Sadewasser A" first="Anne" last="Sadewasser">Anne Sadewasser</name>
<name sortKey="Wolff, Thorsten" sort="Wolff, Thorsten" uniqKey="Wolff T" first="Thorsten" last="Wolff">Thorsten Wolff</name>
</country>
<country name="Égypte">
<noRegion>
<name sortKey="Mostafa, Ahmed" sort="Mostafa, Ahmed" uniqKey="Mostafa A" first="Ahmed" last="Mostafa">Ahmed Mostafa</name>
</noRegion>
</country>
</tree>
</affiliations>
</record>

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