Chimeric camel/human heavy-chain antibodies protect against MERS-CoV infection
Ver/Abrir
Autor/a
Stalin Raj, V.
Okba, Nisreen M. A.
Gutierrez-Alvarez, Javier
Drabek, Dubravka
van Dieren, Brenda
Widagdo, W.
Lamers, Mart M.
Widjaja, Ivy
Fernandez-Delgado, Raul
Sola, Isabel
Koopmans, Marion P.
Osterhaus, Albert D. M. E.
Jan Bosch, Berend
Enjuanes, Luis
Haagmans, Bart L.
Fecha de publicación
2018-08-08ISSN
2375-2548
Resumen
Middle East respiratory syndrome coronavirus (MERS-CoV) continues to cause outbreaks in humans as a result of spillover events from dromedaries. In contrast to humans, MERS-CoV–exposed dromedaries develop only very mild infections and exceptionally potent virus-neutralizing antibody responses. These strong antibody responses may be caused by affinity maturation as a result of repeated exposure to the virus or by the fact that dromedaries—apart from conventional antibodies—have relatively unique, heavy chain–only antibodies (HCAbs). These HCAbs are devoid of light chains and have long complementarity-determining regions with unique epitope binding properties, allowing them to recognize and bind with high affinity to epitopes not recognized by conventional antibodies. Through direct cloning and expression of the variable heavy chains (VHHs) of HCAbs from the bone marrow of MERS-CoV–infected dromedaries, we identified several MERS-CoV–specific VHHs or nanobodies. In vitro, these VHHs efficiently blocked virus entry at picomolar concentrations. The selected VHHs bind with exceptionally high affinity to the receptor binding domain of the viral spike protein. Furthermore, camel/human chimeric HCAbs—composed of the camel VHH linked to a human Fc domain lacking the CH1 exon—had an extended half-life in the serum and protected mice against a lethal MERS-CoV challenge. HCAbs represent a promising alternative strategy to develop novel interventions not only for MERS-CoV but also for other emerging pathogens.
Tipo de documento
Artículo
Versión del documento
Versión publicada
Lengua
Inglés
Materias (CDU)
619 - Veterinària
Páginas
11
Publicado por
American Association for the Advancement of Science
Publicado en
Science Advances
Citación
Stalin Raj, V., Nisreen M. A. Okba, Javier Gutierrez-Alvarez, Dubravka Drabek, Brenda van Dieren, W. Widagdo, and Mart M. Lamers et al. 2018. "Chimeric Camel/Human Heavy-Chain Antibodies Protect Against MERS-Cov Infection". Science Advances 4 (8): eaas9667. American Association for the Advancement of Science (AAAS). doi:10.1126/sciadv.aas9667.
Número del acuerdo de la subvención
EC/PF7/115760/EU/Zoonotic Anticipation and Preparedness Initiative/ZAPI
Program
Sanitat Animal
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