Surprise Discovery Could Lead to Vaccine for Rheumatoid Arthritis
/By Pat Anson, Editor
A surprise discovery at a university laboratory could lead to a vaccine that can prevent rheumatoid arthritis, a chronic and incurable disease in which the body’s own immune system attacks joint tissues.
Researchers at The University of Toledo years were studying a protein called 14-3-3 zeta and its role in immune system pathologies. Previous studies have suggested the protein could be a possible trigger for rheumatoid arthritis (RA) and other autoimmune conditions that cause pain, inflammation and bone erosion.
But researchers found just the opposite. The team discovered that 14-3-3 zeta proteins may actually help prevent arthritis. When they removed the proteins through gene-editing technology, it caused severe early onset arthritis in laboratory animals.
Realizing that the proteins may be beneficial, the team developed an experimental vaccine using purified 14-3-3 zeta protein grown in a bacterial cell. They found the vaccine promoted a strong, immediate and long-lasting response in rodents that protected them from RA.
"Much to our happy surprise, the rheumatoid arthritis totally disappeared in animals that received a vaccine," said Ritu Chakravarti, PhD, an assistant professor at UToledo College of Medicine and lead author of research published in the journal Proceedings of the National Academy of Sciences. "Sometimes there is no better way than serendipity. We happened to hit a wrong result, but it turned out to be the best result. Those kinds of scientific discoveries are very important in this field."
In addition to suppressing the immune system response, the vaccine also significantly improved collagen content and bone quality — findings that suggests there could be long-term benefits following immunization.
Currently, rheumatoid arthritis is treated with steroids or medications that suppress the immune system, such as biologics and biosimilar drugs. While those therapies can alleviate pain and reduce inflammation, they can also make patients more vulnerable to infection and, in the case of biologics, are expensive. Biologic drugs can cost $25,000 a year.
“We have not made any really big discoveries toward treating or preventing rheumatoid arthritis in many years,” Chakravarti said. “Our approach is completely different. This is a vaccine-based strategy based on a novel target that we hope can treat or prevent rheumatoid arthritis. The potential here is huge.”
RA affects about 1.5 million Americans and about one percent of the global population. Women experience RA at a rate three times greater than men, have more severe symptoms and increased disability.
“In spite of its high prevalence, there is no cure and we don’t entirely know what brings it on. This is true of nearly all autoimmune diseases, which makes treating or preventing them so difficult,” said Chakravarti. “If we can successfully get this vaccine into the clinic, it would be revolutionary.”
Chakravarti and her colleagues have filed for a patent on their discovery and are seeking pharmaceutical industry partners to fund more research and preclinical trials.
