SouthernWorldwide.com – A recent laboratory breakthrough, described as “accidental,” has unveiled novel strategies for preventing influenza infections.
Researchers, while examining the replication process of the influenza virus, made a significant discovery: different flu strains employ distinct mechanisms to invade human cells.
By focusing on the specific molecules these viruses depend on for entry, scientists have demonstrated the potential to block their assimilation into new cells and effectively halt their replication.
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These newly acquired “fundamental insights” into seasonal influenza offer a clear direction for the development of more effective preventive medications.
“The hope is that fundamental, curiosity-based research like this helps to pave the way for novel strategies to treat and prevent influenza infections,” stated principal investigator Dr. Emily Bruce from the University of Vermont’s Larner College of Medicine.
While several strains of influenza can cause illness, H1N1 and H3N2 influenza A viruses are the most prevalent. Current diagnostic tests, however, lack the ability to distinguish between them, and clinical treatments remain the same for both.
Despite the availability of vaccines and antiviral medications, Dr. Bruce emphasized the “dire” need for improved treatments to impede the virus’s cell-to-cell transmission.
“You don’t get sick when a virus is in one cell,” she explained. “You get sick because a virus replicates itself and goes into many more cells.”
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The study, published in The Journal of Virology, initially set out to map the transport of viral RNA segments within cells to facilitate the creation of new viral particles.
The research team utilized H1N1 and H3N2 viruses that had been isolated from nasal swabs of patients who tested positive in 2022.
During their investigation, the team serendipitously identified a cellular pathway that inhibited the virus from entering lung cells.
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The data indicated that when a specific human protein, known as Rab11B, was diminished, H3N2 viruses were unable to penetrate human lung cells. H1N1 viruses, conversely, showed no susceptibility to this effect.
Employing reverse genetics, the team meticulously mapped this deficiency, uncovering a previously unknown, H3N2-specific function of Rab11B in the viral entry process.
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This discovery directly challenged the long-held scientific assumption that all influenza viruses utilize identical methods for cellular entry.
“Viruses are like pirates from different countries hijacking someone’s ship,” Dr. Bruce analogized. “Different viruses, like different types of pirates, use different methods to get onboard.”
“We had previously thought that all flu viruses used the same way to get into a cell, but we discovered that this is not true,” she elaborated. “H1N1 and H3N2 need different proteins to get in, and if you get rid of the right protein, a specific virus can’t get in.”
While these findings pinpoint a crucial cellular pathway for viral entry, the researchers acknowledged that the study was conducted using isolated cells.
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Further investigation is imperative to ascertain the safety and efficacy of protein inhibition within a living, complex human respiratory system.
Dr. Bruce and her team aim to conduct additional research to determine if this dependency on Rab11B is an inherent characteristic of H3N2 or a trait specific to currently circulating flu strains.
