Study shows promise for a universal influenza vaccine
Baku, July 20, AZERTAC
New research led by Oregon Health & Science University reveals a promising approach to developing a universal influenza vaccine -- a so-called "one and done" vaccine that confers lifetime immunity against an evolving virus, according to ScienceDaily.
The study, published today in the journal Nature Communications, tested an OHSU-developed vaccine platform against the virus considered most likely to trigger the next pandemic.
Researchers reported the vaccine generated a robust immune response in nonhuman primates that were exposed to the avian H5N1 influenza virus. But the vaccine wasn't based on the contemporary H5N1 virus; instead, the primates were inoculated against the influenza virus of 1918 that killed millions of people worldwide.
"It's exciting because in most cases, this kind of basic science research advances the science very gradually; in 20 years, it might become something," said senior author Jonah Sacha, Ph.D., professor and chief of the Division of Pathobiology at OHSU's Oregon National Primate Research Center. "This could actually become a vaccine in five years or less."
Researchers reported that six of 11 nonhuman primates inoculated against the virus that circulated a century ago -- the 1918 flu -- survived exposure to one of the deadliest viruses in the world today, H5N1. In contrast, a control group of six unvaccinated primates exposed to the H5N1 virus succumbed to the disease.
Sacha said he believes the platform "absolutely" could be useful against other mutating viruses, including SARS-CoV-2.
"It's a very viable approach," he said. "For viruses of pandemic potential, it's critical to have something like this. We set out to test influenza, but we don't know what's going to come next."
A senior co-author from the University of Pittsburgh concurred.
"Should a deadly virus such as H5N1 infect a human and ignite a pandemic, we need to quickly validate and deploy a new vaccine," said co-corresponding author Douglas Reed, Ph.D., associate professor of immunology at the University of Pittsburgh Center for Vaccine Research.
This approach harnesses a vaccine platform previously developed by scientists at OHSU to fight HIV and tuberculosis, and in fact is already being used in a clinical trial against HIV.
The method involves inserting small pieces of target pathogens into the common herpes virus cytomegalovirus, or CMV, which infects most people in their lifetimes and typically produces mild or no symptoms. The virus acts as a vector specifically designed to induce an immune response from the body's own T cells.
This approach differs from common vaccines -- including the existing flu vaccines -- which are designed to induce an antibody response that targets the most recent evolution of the virus, distinguished by the arrangement of proteins covering the exterior surface.
"The problem with influenza is that it's not just one virus," Sacha said. "Like the SARS-CoV-2 virus, it's always evolving the next variant and we're always left to chase where the virus was, not where it's going to be."
The spike proteins on the virus exterior surface evolve to elude antibodies. In the case of flu, vaccines are updated regularly using a best estimate of the next evolution of the virus. Sometimes it's accurate, sometimes less so.
In contrast, a specific type of T cell in the lungs, known as effector memory T cell, targets the internal structural proteins of the virus, rather than its continually mutating outer envelope. This internal structure doesn't change much over time -- presenting a stationary target for T cells to search out and destroy any cells infected by an old or newly evolved influenza virus.
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