According to the latest study, the COVID – 19 causing virus, SARS –Co – 2, persuades memory B cells, long-lived resistance cells that detect pathogens, generate antibodies to obliterate them, and remember them for the future. The next time that pathogens try to enter the body, those memory B cells can leap into action even faster to clear the infection before it starts.
Since memory B cells can survive for decades, they could guard COVID – 19 survivors from succeeding infections for a long time, but further research will have to bear that out.
The study is also the primary to account cross-reactivity of memory B cells — meaning B cells that once bothered cold-causing corona viruses emerged to also recognize SARS-CoV-2. Study authors believe this could mean that anyone who has been infected by a common corona virus — which is nearly everyone — may have some degree of pre-existing immunity to COVID-19.
“When we looked at blood samples from people who were recovering from COVID-19, it looked like many of them had a pre-existing pool of memory B cells that could recognize SARS-CoV-2 and rapidly produce antibodies that could attack it,” said lead study author Mark Sangster, Ph.D., research professor of Microbiology and Immunology at URMC.
“Sangster’s findings are based on a comparison of blood samples from 26 people who were recovering from mild to moderate COVID-19 and 21 healthy donors whose samples were collected six to 10 years ago — long before they could have been exposed to COVID-19. From those samples, study authors measured levels of memory B cells and antibodies that target specific parts of the Spike protein, which exists in all corona viruses and is crucial for helping the viruses infect cells.
The Spike protein looks and acts a little different in each corona virus, but one of its components, the S2 subunit, stays pretty much the same across all of the viruses. Memory B cells can’t tell the difference between the Spike S2 subunits of the different corona viruses, and attack indiscriminately. At least, the study found that was true for betacoronaviruses, a subclass that includes two cold-causing viruses as well as SARS, MERS and SARS-CoV-2.”
“What this study doesn’t show is the level of protection provided by cross-reactive memory B cells and how it impacts patient outcomes.
What’s next,” said David Topham, Ph.D., the Marie Curran Wilson and Joseph Chamberlain Wilson Professor of Microbiology and Immunology at URMC, who runs the lab that conducted this work. “Now we need to see if having this pool of pre-existing memory B cells correlates with milder symptoms and shorter disease course — or if it helps boost the effectiveness of COVID-19 vaccines.”