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Japan: Covid-19 How SARS-CoV-2 Tricks Our Immune System

Source: Press release

Scientists at Hokkaido University and Texas A&M University have identified a key mechanism used by the SARS-CoV-2 virus to evade the immune systems of infected people. The finding might help scientists better understand how Covid-19 infection takes hold.

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The expression of the immune response gene ​​NLRC5 (red purple) is suppressed in SARS-CoV-2 (green) infected cells.
The expression of the immune response gene ​​NLRC5 (red purple) is suppressed in SARS-CoV-2 (green) infected cells.
(Source: Koichi Kobayashi)

Hokkaido/Japan — A discovery made by scientists at Hokkaido University and Texas A&M University reveals how SARS-CoV-2 can evade the human immune defense system. Their results might help to explain why the pandemic has been so severe. “The mechanisms we identified may provide new molecular targets for drug discovery”, Hokkaido University and Texas A&M University immunologist Koichi Kobayashi, who led the study.

The scientists used a bioinformatics approach to look at how SARS-CoV-2, the virus that causes Covid-19, changes gene expression in the immune systems of Covid-19 patients compared to uninfected individuals. This is a useful way to look into the function of complicated cell signalling pathways that trigger immune responses to fight off harmful bacteria and viruses.

MHC (major histocompatibility complex) class I molecules are a central weapon in the immune response against viruses. When a virus infects a cell, the cell facilitates the expression of viral antigens on the surface of infected cells, drawing the attention of immune cells called cytotoxic T cells. These immune cells zero in on and destroy the infected cells, together with the invading virus inside them.

SARS-CoV-2 escapes from immune responses by cytotoxic T cells via impaired MHC-I expression which is caused by reducing both the amount and function of NLRC5.
SARS-CoV-2 escapes from immune responses by cytotoxic T cells via impaired MHC-I expression which is caused by reducing both the amount and function of NLRC5.
(Source: Koichi Kobayashi)

In addition to analysing gene expression in Covid-19 patients, the research team also infected human cell lines with the SARS-CoV-2 virus to validate their findings. The results showed that a protein from the SARS-CoV-2 virus, called ORF 6, suppresses a host cell protein, called NLRC5, responsible for activating the MHC class I pathway. The study showed this happens in two ways. ORF6 hampers cell signalling, which turns off the expression of NLRC5. ORF6 also blocks the function of NLRC5.

Other infectious viruses, including HIV and MERS, are known to also target the MHC class I pathway. Researchers believed that SARS-CoV-2 probably did as well, but this study is the first to unravel the mechanism.

“Without the activation of the MHC class I pathway, viruses in the infected cells are essentially hidden from the immune system. That helps to explain why SARS-CoV-2 virus persists in the body and why it keeps infecting others, leading to the pandemic,” Kobayashi says.

Further research could help find and test drugs that block the activity of the ORF6 viral protein, to restore host cell ability to activate the major histocompatibility complex. If successful, such drugs could encourage the host immune system to clear the virus itself, effectively boosting immune responses.

References: SARS-CoV-2 inhibits induction of the MHC class I pathway by targeting the STAT1-IRF1-NLRC5 axis; Nature Communications; DOI:10.1038/s41467-021-26910-8

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