La Jolla Institute for Immunology (LJI) scientists are at the forefront of investigating how T cells in the immune system respond to various coronaviruses, including SARS and common cold coronaviruses. Their research aims to help in the development of vaccines that can combat multiple types of coronaviruses simultaneously, potentially averting future pandemics.
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In their recent collaborative study published in Cell Reports Medicine, LJI Professor Alessandro Sette, Dr.Biol.Sci., and Research Assistant Professor Alba Grifoni, Ph.D., have revealed the potential of T cells to recognize shared viral targets across different coronaviruses, offering crucial insights into developing broadly effective vaccines.
The team examined the T cell response to viral targets called "antigens" shared among most coronaviruses, including SARS-CoV-2 and common cold coronaviruses. By analyzing the epitopes, specific fragments of these antigens, the researchers explored their conservation across different coronaviruses. They found that T cells could recognize and react to several epitopes across various coronaviruses, providing a potential avenue to enhance vaccines for broader efficacy against multiple coronaviruses and their variants.
This discovery suggests a new strategy for developing vaccines with broader activity against various coronaviruses. T cells, specifically the memory CD4+ "helper" T cells, play a crucial role in identifying protein sequences from past viral infections. These T cells enable the immune system to effectively defend against related viruses, known as cross-reactivity.
The study also highlights the similarities among different coronaviruses. Despite their genetic differences, even distant relatives within the coronavirus family share certain protein sequences. These findings support the possibility of the immune response recognizing multiple viruses within the same family, even if they are not closely related.
In their paper, the team found that T cells exhibited cross-reactivity with common cold coronaviruses and SARS-CoV-2, indicating a potential link between immunity to common cold coronaviruses and protection against severe disease caused by SARS-CoV-2.