
Eric Weaver, Assistant Professor in the School of Biological Sciences, Brigette Corder, graduate student in biology in glasses at right, and Brianna Bullard, graduate student in biology, are researching the Zika Virus. December 3, 2018. Photo by Craig Chandler / University Communication
University of Nebraska-Lincoln researchers may have identified a vaccine that would defend against Zika virus without producing antibodies.
Researcher Eric Weaver described the finding as exciting and novel. He and his team are confident that future experiments will yield significant findings that could have a profound impact on the field of vaccinology.
“If we can figure out the mechanism, we might be able to apply it to other vaccine strategies,” said Weaver, an assistant professor of biological sciences affiliated with the Nebraska Center for Virology. “This would be a huge leap for immunology and vaccine research.
Many studies show that antibodies against Zika virus can worsen Dengue virus infection, which, like Zika, is caused by a mosquito-borne virus. This phenomenon is referred to as antibody-dependent enhancement (ADE) of disease. This has been an obstacle to the development of effective and safe Dengue virus vaccines.
“If you have immunity to one of these viruses and get infected by a second one, the illness can be much worse,” Weaver said. “The body makes the wrong immune response.”
Weaver‘s team, which includes doctoral students Brianna Bullard and Brigette Corder, have been studying potential Zika vaccines since 2016, shortly after a Zika outbreak in Brazil that was declared a global public health emergency by the World Health Organization.
First discovered in Uganda’s Zika Forest in 1947, the virus initially was believed to cause only mild or asymptomatic infection in humans. However, outbreaks in Brazil in 2015 and 2016 resulted in abnormally high rates of congenital birth defects in babies born to infected mothers and an increase in the neurological disorder Guillain-Barré syndrome in adults.
In 2016, between 500,000 and 1.5 million suspected cases of Zika infection were reported worldwide, with 4,300 related cases of microcephaly, or abnormally small heads, in infants.
Bullard, then an undergraduate student at Truman State University, came to Nebraska in 2016 for an undergraduate summer research experience in virology (USREV) and returned to Nebraska as a graduate student because of her interest in fighting Zika.
Bullard, who is from St. Louis, developed a genetically altered version of Adenovirus while working with Weaver as an undergraduate – though she didn’t have enough time to test it before her summer program came to an end. She was eager to return to the project after she graduated from Truman State in December 2016.
“I’m interested in viruses in general and I want to do research in an applied, translational setting,” she said. “I’m most excited about making vaccines that can help people. We’re working on Zika right now, but we also have projects relating to influenza.”
In a study reported online Dec. 20 by Scientific Reports, the Nebraska scientists used two forms of weakened Adenovirus to serve as vectors to deliver the Zika vaccine. Adenoviruses, which typically cause mild illness such as the common cold, are modified so that they are replication-defective and incapable of causing disease. The modified viruses are regarded as safe and highly effective vaccine vectors capable of inducing long-lasting protective immune responses against infectious pathogens.
The researchers inserted structural genes of Zika into key areas of the Adenovirus Type 4 and Adenovirus Type 5 genomes. Tested in mice, both vaccines offered strong T-cell responses and substantial protection against Zika infection. However, the vaccine based on Type 4 Adenovirus induced strong T-cell responses with undetectable antibodies. T cells are a type of white blood cell that are at the core of the system that tailors the body’s adaptive immune response to specific pathogens.
“To our knowledge, this is the first report of a vaccine that uses the prM-E genes of Zika virus to induce protective immunity without inducing anti-Zika virus antibodies,” Weaver said. “The lack of antibodies may very well circumvent the potential risks of ADE, resulting in an effective and safer vaccine than those currently in clinical trials.”
Weaver said more studies are needed to determine why the two virus vectors yielded different results.
Learn more: Nebraska virologists discover safer potential Zika vaccine
The Latest on: Vaccinology
[google_news title=”” keyword=”vaccinology” num_posts=”10″ blurb_length=”0″ show_thumb=”left”]
via Google News
The Latest on: Vaccinology
- HIV vaccines suffer setbacks but new approaches could turn the tideon February 3, 2023 at 6:44 am
Although the Mosaico trial failed, new approaches could soon move HIV vaccinology forward. Only a few weeks into the new year, the prospect of getting a successful advanced HIV vaccine shrank after ...
- Health Rounds: New vaccine design may improve effectivenesson February 2, 2023 at 9:42 am
"The blended mish-mosh works to some extent," but effectiveness can be improved by organizing vaccine components in specific ways, said Chad Mirkin, director of the International Institute for ...
- Rational Vaccinology: A revolutionary new approach to cancer vaccine designon February 2, 2023 at 1:00 am
Researchers have used nanotechnology to develop a new way to increase the potency of almost any cancer vaccine.
- Chicago puts opioid aid into 911 response • Former Outcome Health exec on why he quit • Illinois, feds ending COVID emergencyon February 1, 2023 at 2:16 am
CDPH’s Opioid Response Team launched on Chicago’s West Side this week, with a planned expansion of the program this spring and summer. Under the new model, the city integrates mental health and ...
- New Design Principles To Improve Cancer Vaccineson February 1, 2023 at 1:34 am
New vaccine design principles that are based on adjusting the structural location of an adjuvant and the antigen on a nanoscale vaccine have been shown to greatly increase cancer vaccine performance.
- Cancer vaccines getting a boost from science born in Chicagoon January 31, 2023 at 7:27 pm
And now cancer vaccines are getting a boost from science born in Chicago. Northwestern University scientists have harnessed the power of nanotechnology to improve the way cancer vaccines work. They ...
- Updated COVID booster guidance meant to relieve 'confusing and arduous' processon January 31, 2023 at 6:08 pm
As a Food and Drug Administration advisory committee recommends phasing out the original COVID-19 vaccine in favor of the bivalent formulation use in boosters, uptake of the booster shot remains low ...
- Researchers develop new way to increase the potency of cancer vaccineson January 31, 2023 at 5:25 pm
A new way to significantly increase the potency of almost any vaccine has been developed by researchers from the International Institute for Nanotechnology (IIN) at Northwestern University.
- Transforming the way cancer vaccines are designed and madeon January 31, 2023 at 11:48 am
A new way to significantly increase the potency of almost any vaccine has been developed. The scientists used chemistry and nanotechnology to change the structural location of adjuvants and antigens ...
- Scientists establish blueprint to redevelop cancer vaccineson January 31, 2023 at 8:01 am
Scientists have developed a Blueprint to redevelop and improve vaccine structure for seven different types of cancer.
via Bing News