Modular adjuvant-free pan-HLA-DR-immunotargeting subunit vaccine against SARS-CoV-2 elicits broad sarbecovirus-neutralizing antibody responses
- The Hospital for Sick Children Research Institute, Toronto, ON (Canada); University of Toronto, ON (Canada)
- National Centre for Foreign Animal Disease, Winnipeg, MB (Canada); University of Manitoba, Winnipeg, MB (Canada)
- Keenan Research Centre, Toronto, ON (Canada)
- The Hospital for Sick Children Research Institute, Toronto, ON (Canada)
- The Hospital for Sick Children Research Institute, Toronto, ON (Canada); Basque Foundation for Science, Bilbao (Spain); University of the Basque Country UPV/EHU, Vitoria (Spain); Bioaraba, Microbiology, Infectious Disease, Antimicrobial Agents, and Gene Therapy, Vitoria (Spain)
- Keenan Research Centre, Toronto, ON (Canada); University of Toronto, ON (Canada)
- University of Toronto, ON (Canada)
Subunit vaccines typically require co-administration with an adjuvant to elicit protective immunity, adding development hurdles that can impede rapid pandemic responses. To circumvent the need for adjuvant in a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) subunit vaccine, we engineer a thermostable immunotargeting vaccine (ITV) that leverages the pan-HLA-DR monoclonal antibody 44H10 to deliver the viral spike protein receptor-binding domain (RBD) to antigen-presenting cells. X-ray crystallography shows that 44H10 binds to a conserved epitope on HLA-DR, providing the basis for its broad HLA-DR reactivity. Adjuvant-free ITV immunization in rabbits and ferrets induces robust anti-RBD antibody responses that neutralize SARS-CoV-2 variants of concern and protect recipients from SARS-CoV-2 challenge. We demonstrate that the modular nature of the ITV scaffold with respect to helper T cell epitopes and diverse RBD antigens facilitates broad sarbecovirus neutralization. Our findings support anti-HLA-DR immunotargeting as an effective means to induce strong antibody responses to subunit antigens without requiring an adjuvant.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- European Union’s Horizon 2020 research and innovation program; Hospital for Sick Children Foundation; National Cancer Institute; National Institute of General Medical Sciences; National Institutes of Health (NIH); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 2423518
- Journal Information:
- Cell Reports, Journal Name: Cell Reports Journal Issue: 4 Vol. 42; ISSN 2211-1247
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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