Researchers at Yale School of Medicine discovered that a pair of proteins on nerve cells may act like delivery trucks for the toxic protein that drives Parkinson's disease.
Parkinson's disease slowly destroys brain cells. A scrambled protein called alpha‑synuclein builds up and spreads, making symptoms get worse over time.
The big mystery was how this bad protein gets into healthy cells after leaving a dying one. A new study in Nature Communications points to two surface proteins—mGluR4 and NPDC1—as the key carriers.
A Fresh Look at Disease Progression
"Alpha‑synuclein is the hallmark of Parkinson's," said the lead scientist. "If we can block its entry, we might slow the disease."
How the Protein Enters Cells
To find the entry point, the team made 4,400 cell groups, each showing a different surface protein. Most proteins ignored alpha‑synuclein, but 16 caught its attention.
Two of those, mGluR4 and NPDC1, are common on dopamine‑producing neurons in the brain region called the substantia nigra, which is hit hardest by Parkinson's.
Testing the Idea in Mice
Scientists created mice that lacked either mGluR4 or NPDC1. When these mice were exposed to the harmful protein, they did not develop the usual brain deposits or movement problems.
Normal mice, however, showed the classic signs of Parkinson's. Removing either protein also helped a second mouse model live longer and stay healthier.
Why This Matters
Current medicines only relieve symptoms. They do not stop the disease from spreading.
If doctors can block mGluR4 and NPDC1, they might keep alpha‑synuclein from hopping between neurons, potentially slowing or halting the illness.
The Growing Need for Better Treatments
About 1.1 million Americans live with Parkinson's, and nearly 90,000 new cases appear each year. As the population ages, the number of people at risk will rise sharply.
“An aging society means more brains at risk,” the researcher noted. “Finding ways to protect neurons is a huge challenge, and now we have a new target to explore.”