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Development and Characterization of a Severe Acute Respiratory Syndrome—Associated Coronavirus—Neutralizing Human Monoclonal Antibody That Provides Effective Immunoprophylaxis in Mice

Identifieur interne : 000116 ( Istex/Curation ); précédent : 000115; suivant : 000117

Development and Characterization of a Severe Acute Respiratory Syndrome—Associated Coronavirus—Neutralizing Human Monoclonal Antibody That Provides Effective Immunoprophylaxis in Mice

Auteurs : Thomas C. Greenough ; Gregory J. Babcock ; Anjeanette Roberts [États-Unis] ; Hector J. Hernandez ; William D. Thomas ; Jennifer A. Coccia ; Robert F. Graziano [États-Unis] ; Mohan Srinivasan [États-Unis] ; Israel Lowy [États-Unis] ; Robert W. Finberg ; Kanta Subbarao [États-Unis] ; Leatrice Vogel [États-Unis] ; Mohan Somasundaran ; Katherine Luzuriaga ; John L. Sullivan ; Donna M. Ambrosino [États-Unis]

Source :

RBID : ISTEX:7CB88620517082BC45CE0C0F88DECD9DD63F494A

Abstract

Background. Severe acute respiratory syndrome (SARS) remains a significant public health concern after the epidemic in 2003. Human monoclonal antibodies (MAbs) that neutralize SARS-associated coronavirus (SARSCoV) could provide protection for exposed individuals. Methods. Transgenic mice with human immunoglobulin genes were immunized with the recombinant major surface (S) glycoprotein ectodomain of SARS-CoV. Epitopes of 2 neutralizing MAbs derived from these mice were mapped and evaluated in a murine model of SARS-CoV infection. Results. Both MAbs bound to S glycoprotein expressed on transfected cells but differed in their ability to block binding of S glycoprotein to Vero E6 cells. Immunoprecipitation analysis revealed 2 antibody-binding epitopes: one MAb (201) bound within the receptor-binding domain at aa 490–510, and the other MAb (68) bound externally to the domain at aa 130–150. Mice that received 40 mg/kg of either MAb prior to challenge with SARS-CoV were completely protected from virus replication in the lungs, and doses as low as 1.6 mg/kg offered significant protection. Conclusions. Two neutralizing epitopes were defined for MAbs to SARS-CoV S glycoprotein. Antibodies to both epitopes protected mice against SARS-CoV challenge. Clinical trials are planned to test MAb 201, a fully human MAb specific for the epitope within the receptor-binding region.

Url:
DOI: 10.1086/427242

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ISTEX:7CB88620517082BC45CE0C0F88DECD9DD63F494A

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Thomas C. Greenough
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Gregory J. Babcock
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Hector J. Hernandez
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William D. Thomas
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Jennifer A. Coccia
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Robert W. Finberg
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Mohan Somasundaran
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Katherine Luzuriaga
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John L. Sullivan
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<name sortKey="Finberg, Robert W" sort="Finberg, Robert W" uniqKey="Finberg R" first="Robert W" last="Finberg">Robert W. Finberg</name>
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<region type="state">Maryland</region>
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<name sortKey="Luzuriaga, Katherine" sort="Luzuriaga, Katherine" uniqKey="Luzuriaga K" first="Katherine" last="Luzuriaga">Katherine Luzuriaga</name>
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<name sortKey="Sullivan, John L" sort="Sullivan, John L" uniqKey="Sullivan J" first="John L." last="Sullivan">John L. Sullivan</name>
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<wicri:noCountry code="subField">Worcester</wicri:noCountry>
</affiliation>
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<name sortKey="Ambrosino, Donna M" sort="Ambrosino, Donna M" uniqKey="Ambrosino D" first="Donna M." last="Ambrosino">Donna M. Ambrosino</name>
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<mods:affiliation>E-mail: donna.ambrosino@umassmed.edu</mods:affiliation>
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</affiliation>
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<mods:affiliation>Reprints or correspondence: Dr. Donna M. Ambrosino, Massachusetts Biologic Laboratories, 305 South St., Jamaica Plain, MA 02130 (donna.ambrosino@umassmed.edu).</mods:affiliation>
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<region type="state">Massachusetts</region>
</placeName>
<wicri:cityArea>Reprints or correspondence: Dr. Donna M. Ambrosino, Massachusetts Biologic Laboratories, 305 South St., Jamaica Plain</wicri:cityArea>
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<series>
<title level="j" type="main">The Journal of Infectious Diseases</title>
<title level="j" type="abbrev">The Journal of Infectious Diseases</title>
<idno type="ISSN">0022-1899</idno>
<idno type="eISSN">1537-6613</idno>
<imprint>
<publisher>The University of Chicago Press</publisher>
<date type="published">2005</date>
<biblScope unit="vol">191</biblScope>
<biblScope unit="issue">4</biblScope>
<biblScope unit="page" from="507">507</biblScope>
<biblScope unit="page" to="514">514</biblScope>
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<div type="abstract">Background. Severe acute respiratory syndrome (SARS) remains a significant public health concern after the epidemic in 2003. Human monoclonal antibodies (MAbs) that neutralize SARS-associated coronavirus (SARSCoV) could provide protection for exposed individuals. Methods. Transgenic mice with human immunoglobulin genes were immunized with the recombinant major surface (S) glycoprotein ectodomain of SARS-CoV. Epitopes of 2 neutralizing MAbs derived from these mice were mapped and evaluated in a murine model of SARS-CoV infection. Results. Both MAbs bound to S glycoprotein expressed on transfected cells but differed in their ability to block binding of S glycoprotein to Vero E6 cells. Immunoprecipitation analysis revealed 2 antibody-binding epitopes: one MAb (201) bound within the receptor-binding domain at aa 490–510, and the other MAb (68) bound externally to the domain at aa 130–150. Mice that received 40 mg/kg of either MAb prior to challenge with SARS-CoV were completely protected from virus replication in the lungs, and doses as low as 1.6 mg/kg offered significant protection. Conclusions. Two neutralizing epitopes were defined for MAbs to SARS-CoV S glycoprotein. Antibodies to both epitopes protected mice against SARS-CoV challenge. Clinical trials are planned to test MAb 201, a fully human MAb specific for the epitope within the receptor-binding region.</div>
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