UGA researchers discovered the link between chlorpyrifos, a synthetic successor to DDT, and Parkinson’s by accident, Kanthasamy says. “We didn’t anticipate this, we just thought, ‘let’s examine this mechanism.’” The group modeled their finding in cell cultures and mice. Soon after their discovery was published, a separate human study showed that people exposed to the pesticide chlorpyrifos exhibit Parkinson’s-like symptoms.
It is corroborative findings like these that appeal to Kanthasamy as a researcher funded by Isakson’s foundation. “I admire his ideals, Isakson, our senator,” she says. He was known for embracing bipartisan discussions of the problems before Congress, encouraging both sides of the political spectrum to work in a unified manner.
“I was motivated by this. This is the same issue in science. I have my opinion, you have your opinion, so we cannot come to a unified agreement. In science we cannot do that, but still, we can work with other researchers to broaden the field,” she says.
And so, the widening scope of research that is identifying risk factors for Parkinson’s and Alzheimer’s is creating an opportunity to intervene with vulnerable populations before diagnosis. Currently, a clinical diagnosis of Parkinson’s is made after a patient has lost 60 to 70 percent of dopamine neurons in the brain. Dopamine is a neurotransmitter responsible for memory, movement, motivation, mood, attention and more, thus accounting for the hallmark symptoms of tremors, memory loss, and depression.
Further research into the way pesticides affect humans may allow the kind of personalized or precision medicine used in cancer treatment.
“We try to look at how a person’s genetics modify their response to a pesticide and how that leads to disease,” Richardson says. “If we know who’s at risk, know then they’ve been exposed, understand how those pesticides are working then we may want to give that person a different treatment than someone who might not have been exposed.”
It’s a phenomenon that happens frequently in clinical trials for new drugs. The trial as a whole might be deemed a failure because the medication didn’t work on all participants, but certain individuals may have actually found relief.
“There’s not going to be one magic bullet for any of these because each person is different,” Richardson says. By understanding why some respond better to certain treatments, future interventions can be tailored in a way to slow down the progression of the disease.
Kanthasamy is working a second path that has identified biomarkers related to neuroinflammation. A major malfunction of the brain and immune system, neuroinflammation is thought to be involved in the progression if not the initiation of Parkinson’s and possibly Alzheimer’s as well.
The ability to detect these changes through minimally invasive testing can help predict someone’s risk for developing these diseases and allow earlier medical intervention.
The Isakson Distinguished Professorships will allow Kanthasamy and Richardson the opportunity to continue their cutting edge research on neurodegenerative diseases, and could eventually lead to larger grants from organizations like the National Institutes of Health (NIH).