Researchers have created a new vaccine technology that, in tests with mice, has demonstrated protection against a wide variety of coronaviruses, including those that could cause future disease outbreaks—even those not yet identified.
This is a new approach to vaccine development called 'proactive vaccinology', where scientists build a vaccine before the disease-causing pathogen even emerges.
The new vaccine works by training the body's immune system to recognize specific regions of eight different coronaviruses, including SARS-CoV-1, SARS-CoV-2, and several that are currently circulating in bats and have potential to jump to humans and cause a pandemic.
Key to its effectiveness is that the specific virus regions the vaccine targets also appear in many related coronaviruses. By training the immune system to attack these regions, it gives protection against other coronaviruses not represented in the vaccine – including ones that haven't even been identified yet.
Immune Response and Research Goals
For example, the new vaccine does not include the SARS-CoV-1 coronavirus, which caused the 2003 SARS outbreak, yet it still induces an immune response to that virus.
"Our focus is to create a vaccine that will protect us against the next coronavirus pandemic, and have it ready before the pandemic has even started," said Rory Hills, a graduate researcher in the University of Cambridge's Department of Pharmacology and first author of the report.
He added: "We've created a vaccine that provides protection against a broad range of different coronaviruses – including ones we don't even know about yet."
The results were published in the journal Nature Nanotechnology.
Rory Hills, a graduate researcher in the University of Cambridge's Department of Pharmacology, wants to be ready with a vaccine that will protect us against the next coronavirus pandemic before the pandemic has even started. Credit: Jacqueline Garget
"We don't have to wait for new coronaviruses to emerge. We know enough about coronaviruses, and different immune responses to them, that we can get going with building protective vaccines against unknown coronaviruses now," said Professor Mark Howarth in the University of Cambridge's Department of Pharmacology, senior author of the report.
He added: "Scientists did a great job in quickly producing an extremely effective COVID vaccine during the last pandemic, but the world still had a massive crisis with a huge number of deaths. We need to work out how we can do even better than that in the future, and a powerful component of that is starting to build the vaccines in advance."
The new 'Quartet Nanocage' vaccine is based on a structure called a nanoparticle – a ball of proteins held together by incredibly strong interactions. Chains of different viral antigens are attached to this nanoparticle using a novel 'protein superglue'. Multiple antigens are included in these chains, which trains the immune system to target specific regions shared across a broad range of coronaviruses.
Collaborative Efforts and Technological Innovations
This study demonstrated that the new vaccine raises a broad immune response, even in mice that were pre-immunized with SARS-CoV-2.
The new vaccine is much simpler in design than other broadly protective vaccines currently in development, which the researchers say should accelerate its route into clinical trials.
The underlying technology they have developed also has the potential for use in vaccine development to protect against many other health challenges.
The work involved a collaboration between scientists at the University of Cambridge, the University of Oxford, and Caltech. It improves on previous work, by the Oxford and Caltech groups, to develop a novel all-in-one vaccine against coronavirus threats. The vaccine developed by Oxford and Caltech should enter Phase 1 clinical trials in early 2025, but its complex nature makes it challenging to manufacture which could limit large-scale production.
Conventional vaccines include a single antigen to train the immune system to target a single specific virus. This may not protect against a diverse range of existing coronaviruses, or against pathogens that are newly emerging.
Reference: "Proactive vaccination using multiviral Quartet Nanocages to elicit broad anti-coronavirus responses" by Rory A. Hills, Tiong Kit Tan, Alexander A. Cohen, Jennifer R. Keeffe, Anthony H. Keeble, Priyanthi N. P. Gnanapragasam, Kaya N. Storm, Annie V. Rorick, Anthony P. West Jr., Michelle L. Hill, Sai Liu, Javier Gilbert-Jaramillo, Madeeha Afzal, Amy Napier, Gabrielle Admans, William S. James, Pamela J. Bjorkman, Alain R. Townsend and Mark R. Howarth, 6 May 2024, Nature Nanotechnology.
DOI: 10.1038/s41565-024-01655-9
The study was funded by the Biotechnology and Biological Sciences Research Council.
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