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Antibodies against trimeric S glycoprotein protect hamsters against SARS-CoV challenge despite their capacity to mediate FcγRII-dependent entry into B cells in vitro

Identifieur interne : 003B88 ( Main/Exploration ); précédent : 003B87; suivant : 003B89

Antibodies against trimeric S glycoprotein protect hamsters against SARS-CoV challenge despite their capacity to mediate FcγRII-dependent entry into B cells in vitro

Auteurs : YIU WING KAM [Hong Kong] ; Francois Kien [Hong Kong] ; Anjeanette Roberts [États-Unis] ; YAN CHUNG CHEUNG [Hong Kong] ; Elaine W. Lamirande [États-Unis] ; Leatrice Vogel [États-Unis] ; SHUI LING CHU [Hong Kong] ; Jane Tse [Hong Kong] ; Jeannette Guarner [États-Unis] ; Sherif R. Zaki [États-Unis] ; Kanta Subbarao [États-Unis] ; Malik Peiris [Hong Kong] ; Beatrice Nal [Hong Kong] ; Ralf Altmeyer [Singapour]

Source :

RBID : Pascal:07-0076955

Descripteurs français

English descriptors

Abstract

Vaccine-induced antibodies can prevent or, in the case of feline infectious peritonitis virus, aggravate infections by coronaviruses. We investigated whether a recombinant native full-length S-protein trimer (triSpike) of severe acute respiratory syndrome coronavirus (SARS-CoV) was able to elicit a neutralizing and protective immune response in animals and analyzed the capacity of anti-S antibodies to mediate antibody-dependent enhancement (ADE) of virus entry in vitro and enhancement of replication in vivo. SARS-CoV-specific serum and mucosal immunoglobulins were readily detected in immunized animals. Serum IgG blocked binding of the S-protein to the ACE2 receptor and neutralized SARS-CoV infection in vitro. Entry into human B cell lines occurred in a FcγRII-dependent and ACE2-independent fashion indicating that ADE of virus entry is a novel cell entry mechanism of SARS-CoV. Vaccinated animals showed no signs of enhanced lung pathology or hepatitis and viral load was undetectable or greatly reduced in lungs following challenge with SARS-CoV. Altogether our results indicate that a recombinant trimeric S protein was able to elicit an efficacious protective immune response in vivo and warrant concern in the safety evaluation of a human vaccine against SARS-CoV.


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">Vaccine-induced antibodies can prevent or, in the case of feline infectious peritonitis virus, aggravate infections by coronaviruses. We investigated whether a recombinant native full-length S-protein trimer (triSpike) of severe acute respiratory syndrome coronavirus (SARS-CoV) was able to elicit a neutralizing and protective immune response in animals and analyzed the capacity of anti-S antibodies to mediate antibody-dependent enhancement (ADE) of virus entry in vitro and enhancement of replication in vivo. SARS-CoV-specific serum and mucosal immunoglobulins were readily detected in immunized animals. Serum IgG blocked binding of the S-protein to the ACE2 receptor and neutralized SARS-CoV infection in vitro. Entry into human B cell lines occurred in a FcγRII-dependent and ACE2-independent fashion indicating that ADE of virus entry is a novel cell entry mechanism of SARS-CoV. Vaccinated animals showed no signs of enhanced lung pathology or hepatitis and viral load was undetectable or greatly reduced in lungs following challenge with SARS-CoV. Altogether our results indicate that a recombinant trimeric S protein was able to elicit an efficacious protective immune response in vivo and warrant concern in the safety evaluation of a human vaccine against SARS-CoV.</div>
</front>
</TEI>
<affiliations>
<list>
<country>
<li>Hong Kong</li>
<li>Singapour</li>
<li>États-Unis</li>
</country>
<region>
<li>Géorgie (États-Unis)</li>
<li>Maryland</li>
</region>
</list>
<tree>
<country name="Hong Kong">
<noRegion>
<name sortKey="Yiu Wing Kam" sort="Yiu Wing Kam" uniqKey="Yiu Wing Kam" last="Yiu Wing Kam">YIU WING KAM</name>
</noRegion>
<name sortKey="Kien, Francois" sort="Kien, Francois" uniqKey="Kien F" first="Francois" last="Kien">Francois Kien</name>
<name sortKey="Nal, Beatrice" sort="Nal, Beatrice" uniqKey="Nal B" first="Beatrice" last="Nal">Beatrice Nal</name>
<name sortKey="Peiris, Malik" sort="Peiris, Malik" uniqKey="Peiris M" first="Malik" last="Peiris">Malik Peiris</name>
<name sortKey="Shui Ling Chu" sort="Shui Ling Chu" uniqKey="Shui Ling Chu" last="Shui Ling Chu">SHUI LING CHU</name>
<name sortKey="Tse, Jane" sort="Tse, Jane" uniqKey="Tse J" first="Jane" last="Tse">Jane Tse</name>
<name sortKey="Yan Chung Cheung" sort="Yan Chung Cheung" uniqKey="Yan Chung Cheung" last="Yan Chung Cheung">YAN CHUNG CHEUNG</name>
</country>
<country name="États-Unis">
<region name="Maryland">
<name sortKey="Roberts, Anjeanette" sort="Roberts, Anjeanette" uniqKey="Roberts A" first="Anjeanette" last="Roberts">Anjeanette Roberts</name>
</region>
<name sortKey="Guarner, Jeannette" sort="Guarner, Jeannette" uniqKey="Guarner J" first="Jeannette" last="Guarner">Jeannette Guarner</name>
<name sortKey="Lamirande, Elaine W" sort="Lamirande, Elaine W" uniqKey="Lamirande E" first="Elaine W." last="Lamirande">Elaine W. Lamirande</name>
<name sortKey="Subbarao, Kanta" sort="Subbarao, Kanta" uniqKey="Subbarao K" first="Kanta" last="Subbarao">Kanta Subbarao</name>
<name sortKey="Vogel, Leatrice" sort="Vogel, Leatrice" uniqKey="Vogel L" first="Leatrice" last="Vogel">Leatrice Vogel</name>
<name sortKey="Zaki, Sherif R" sort="Zaki, Sherif R" uniqKey="Zaki S" first="Sherif R." last="Zaki">Sherif R. Zaki</name>
</country>
<country name="Singapour">
<noRegion>
<name sortKey="Altmeyer, Ralf" sort="Altmeyer, Ralf" uniqKey="Altmeyer R" first="Ralf" last="Altmeyer">Ralf Altmeyer</name>
</noRegion>
</country>
</tree>
</affiliations>
</record>

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