Researchers have made an accidental discovery revealing that H3N2 and H1N1 flu strains utilize distinct strategies to enter cells, paving the way for new prevention methods against influenza.
An unexpected breakthrough in a laboratory has unveiled new avenues for preventing influenza. While studying the replication mechanisms of the flu virus, researchers found that different strains utilize unique strategies to infiltrate human cells, according to a report by SWNS.
By targeting the specific molecules that these viruses depend on, scientists discovered they could effectively block the viruses from entering new cells and halt their replication. This research highlights the potential for developing improved preventive medications against seasonal influenza.
“The hope is that fundamental, curiosity-based research like this helps to pave the way for novel strategies to treat and prevent influenza infections,” said principal investigator Dr. Emily Bruce from the University of Vermont’s Larner College of Medicine.
Among the various strains of flu, H1N1 and H3N2 influenza A viruses are the most prevalent. However, current testing methods are unable to distinguish between these two strains, and clinical treatments remain the same for both. Despite the availability of vaccines and antiviral medications, Dr. Bruce emphasized the urgent need for more effective treatments to prevent the virus from spreading from cell to cell.
“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.”
The study, published in *The Journal of Virology*, initially aimed to map how viral RNA segments are transported within cells to produce new viral particles. The research team utilized H1N1 and H3N2 viruses isolated from the nasal passages of patients who tested positive in 2022.
During their investigation, the researchers unexpectedly discovered a cellular pathway that could block the virus from entering lung cells. Their findings revealed that when a specific human protein known as Rab11B was depleted, H3N2 viruses were unable to enter human lung cells, while H1N1 viruses remained unaffected.
Using reverse genetics, the team mapped this defect and identified a novel, H3N2-specific role for Rab11B during the viral entry process. This discovery challenges the long-held scientific assumption that all flu viruses enter cells in the same manner.
“Viruses are like pirates from different countries hijacking someone’s ship,” Dr. Bruce remarked. “Different viruses, like different types of pirates, use different methods to get onboard.”
She further elaborated, “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. 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 shed light on a critical cellular pathway for viral entry, the researchers acknowledged that the study was conducted using isolated cells. Further research is necessary to determine whether blocking the Rab11B protein is safe and effective within the complex environment of a live human respiratory system.
Dr. Bruce and her team are eager to conduct additional studies to ascertain whether the Rab11B dependency is a fundamental characteristic of H3N2 or if it is a trait unique to the currently circulating flu strains.
According to SWNS, this research could significantly influence future strategies for influenza prevention and treatment, potentially leading to more effective interventions against this widespread virus.