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Human Monoclonal Antibody Combination against SARS Coronavirus: Synergy and Coverage of Escape Mutants

Identifieur interne : 003E74 ( Main/Exploration ); précédent : 003E73; suivant : 003E75

Human Monoclonal Antibody Combination against SARS Coronavirus: Synergy and Coverage of Escape Mutants

Auteurs : Jan Ter Meulen ; Edward N. Van Den Brink ; Leo L. M. Poon ; Wilfred E. Marissen ; Cynthia S. W. Leung ; Freek Cox ; Chung Y. Cheung ; Arjen Q. Bakker ; Johannes A. Bogaards ; Els Van Deventer ; Wolfgang Preiser ; Hans Wilhelm Doerr ; Vincent T. Chow ; John De Kruif ; Joseph S. M. Peiris ; Jaap Goudsmit

Source :

RBID : PMC:1483912

Descripteurs français

English descriptors

Abstract

Background

Experimental animal data show that protection against severe acute respiratory syndrome coronavirus (SARS-CoV) infection with human monoclonal antibodies (mAbs) is feasible. For an effective immune prophylaxis in humans, broad coverage of different strains of SARS-CoV and control of potential neutralization escape variants will be required. Combinations of virus-neutralizing, noncompeting mAbs may have these properties.

Methods and Findings

Human mAb CR3014 has been shown to completely prevent lung pathology and abolish pharyngeal shedding of SARS-CoV in infected ferrets. We generated in vitro SARS-CoV variants escaping neutralization by CR3014, which all had a single P462L mutation in the glycoprotein spike (S) of the escape virus. In vitro experiments confirmed that binding of CR3014 to a recombinant S fragment (amino acid residues 318–510) harboring this mutation was abolished. We therefore screened an antibody-phage library derived from blood of a convalescent SARS patient for antibodies complementary to CR3014. A novel mAb, CR3022, was identified that neutralized CR3014 escape viruses, did not compete with CR3014 for binding to recombinant S1 fragments, and bound to S1 fragments derived from the civet cat SARS-CoV-like strain SZ3. No escape variants could be generated with CR3022. The mixture of both mAbs showed neutralization of SARS-CoV in a synergistic fashion by recognizing different epitopes on the receptor-binding domain. Dose reduction indices of 4.5 and 20.5 were observed for CR3014 and CR3022, respectively, at 100% neutralization. Because enhancement of SARS-CoV infection by subneutralizing antibody concentrations is of concern, we show here that anti-SARS-CoV antibodies do not convert the abortive infection of primary human macrophages by SARS-CoV into a productive one.

Conclusions

The combination of two noncompeting human mAbs CR3014 and CR3022 potentially controls immune escape and extends the breadth of protection. At the same time, synergy between CR3014 and CR3022 may allow for a lower total antibody dose to be administered for passive immune prophylaxis of SARS-CoV infection.


Url:
DOI: 10.1371/journal.pmed.0030237
PubMed: 16796401
PubMed Central: 1483912


Affiliations:


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Le document en format XML

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<term>Antibodies, Monoclonal (immunology)</term>
<term>Antibodies, Monoclonal (therapeutic use)</term>
<term>Antibody Affinity</term>
<term>Antibody Specificity</term>
<term>Antigen-Antibody Reactions</term>
<term>Antigenic Variation</term>
<term>Antigens, Viral (immunology)</term>
<term>Base Sequence</term>
<term>Binding Sites</term>
<term>Cells, Cultured (virology)</term>
<term>Chlorocebus aethiops</term>
<term>Disease Outbreaks</term>
<term>Dose-Response Relationship, Immunologic</term>
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<term>Immunoglobulin Heavy Chains (genetics)</term>
<term>Immunoglobulin Heavy Chains (immunology)</term>
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<term>Immunoglobulin Variable Region</term>
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<term>Severe Acute Respiratory Syndrome</term>
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<term>Protéines de l'enveloppe virale</term>
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<term>Chaines légères des immunoglobulines</term>
<term>Glycoprotéines membranaires</term>
<term>Protéines de fusion recombinantes</term>
<term>Protéines de l'enveloppe virale</term>
<term>Région variable d'immunoglobuline</term>
<term>Virus du SRAS</term>
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<term>SARS Virus</term>
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<term>Severe Acute Respiratory Syndrome</term>
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<term>Syndrome respiratoire aigu sévère</term>
</keywords>
<keywords scheme="MESH" qualifier="usage thérapeutique" xml:lang="fr">
<term>Anticorps monoclonaux</term>
</keywords>
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<term>Cellules cultivées</term>
<term>Macrophages</term>
<term>Nandiniidae</term>
<term>Syndrome respiratoire aigu sévère</term>
</keywords>
<keywords scheme="MESH" qualifier="virology" xml:lang="en">
<term>Cells, Cultured</term>
<term>Macrophages</term>
<term>Nandiniidae</term>
<term>Severe Acute Respiratory Syndrome</term>
</keywords>
<keywords scheme="MESH" qualifier="épidémiologie" xml:lang="fr">
<term>Syndrome respiratoire aigu sévère</term>
</keywords>
<keywords scheme="MESH" xml:lang="en">
<term>Amino Acid Substitution</term>
<term>Animals</term>
<term>Antibody Affinity</term>
<term>Antibody Specificity</term>
<term>Antigen-Antibody Reactions</term>
<term>Antigenic Variation</term>
<term>Base Sequence</term>
<term>Binding Sites</term>
<term>Chlorocebus aethiops</term>
<term>Disease Outbreaks</term>
<term>Dose-Response Relationship, Immunologic</term>
<term>Drug Synergism</term>
<term>Humans</term>
<term>Immune Sera</term>
<term>Immunization, Passive</term>
<term>Molecular Sequence Data</term>
<term>Mutation, Missense</term>
<term>Neutralization Tests</term>
<term>Point Mutation</term>
<term>Protein Structure, Tertiary</term>
<term>Spike Glycoprotein, Coronavirus</term>
<term>Surface Plasmon Resonance</term>
<term>Vero Cells</term>
<term>Virus Replication</term>
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<keywords scheme="MESH" xml:lang="fr">
<term>Affinité des anticorps</term>
<term>Animaux</term>
<term>Cellules Vero</term>
<term>Données de séquences moléculaires</term>
<term>Flambées de maladies</term>
<term>Glycoprotéine de spicule des coronavirus</term>
<term>Humains</term>
<term>Immunisation passive</term>
<term>Mutation faux-sens</term>
<term>Mutation ponctuelle</term>
<term>Relation dose-réponse (immunologie)</term>
<term>Réaction antigène-anticorps</term>
<term>Région variable d'immunoglobuline</term>
<term>Réplication virale</term>
<term>Résonance plasmonique de surface</term>
<term>Sites de fixation</term>
<term>Spécificité des anticorps</term>
<term>Structure tertiaire des protéines</term>
<term>Substitution d'acide aminé</term>
<term>Syndrome respiratoire aigu sévère</term>
<term>Synergie des médicaments</term>
<term>Séquence nucléotidique</term>
<term>Sérums immuns</term>
<term>Tests de neutralisation</term>
<term>Variation des antigènes</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front>
<div type="abstract" xml:lang="en">
<sec id="st1">
<title>Background</title>
<p>Experimental animal data show that protection against severe acute respiratory syndrome coronavirus (SARS-CoV) infection with human monoclonal antibodies (mAbs) is feasible. For an effective immune prophylaxis in humans, broad coverage of different strains of SARS-CoV and control of potential neutralization escape variants will be required. Combinations of virus-neutralizing, noncompeting mAbs may have these properties.</p>
</sec>
<sec id="st2">
<title>Methods and Findings</title>
<p>Human mAb CR3014 has been shown to completely prevent lung pathology and abolish pharyngeal shedding of SARS-CoV in infected ferrets. We generated in vitro SARS-CoV variants escaping neutralization by CR3014, which all had a single P462L mutation in the glycoprotein spike (S) of the escape virus. In vitro experiments confirmed that binding of CR3014 to a recombinant S fragment (amino acid residues 318–510) harboring this mutation was abolished. We therefore screened an antibody-phage library derived from blood of a convalescent SARS patient for antibodies complementary to CR3014. A novel mAb, CR3022, was identified that neutralized CR3014 escape viruses, did not compete with CR3014 for binding to recombinant S1 fragments, and bound to S1 fragments derived from the civet cat SARS-CoV-like strain SZ3. No escape variants could be generated with CR3022. The mixture of both mAbs showed neutralization of SARS-CoV in a synergistic fashion by recognizing different epitopes on the receptor-binding domain. Dose reduction indices of 4.5 and 20.5 were observed for CR3014 and CR3022, respectively, at 100% neutralization. Because enhancement of SARS-CoV infection by subneutralizing antibody concentrations is of concern, we show here that anti-SARS-CoV antibodies do not convert the abortive infection of primary human macrophages by SARS-CoV into a productive one.</p>
</sec>
<sec id="st3">
<title>Conclusions</title>
<p>The combination of two noncompeting human mAbs CR3014 and CR3022 potentially controls immune escape and extends the breadth of protection. At the same time, synergy between CR3014 and CR3022 may allow for a lower total antibody dose to be administered for passive immune prophylaxis of SARS-CoV infection.</p>
</sec>
</div>
</front>
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<name sortKey="Chow, Vincent T" sort="Chow, Vincent T" uniqKey="Chow V" first="Vincent T" last="Chow">Vincent T. Chow</name>
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