Study Rationale:
In Parkinson’s disease (PD), certain brain cells that make dopamine, called A9 neurons, slowly die. These cells are very active and have long, branching connections, which makes them use a lot of energy and leaves them fragile. Nearby dopamine neurons, called A10 neurons, are less active and usually survive. Current lab models don’t show these important differences. We need better tools to understand why A9 neurons show specific vulnerability in PD.
Hypothesis:
We believe that the extraordinary size and high activity of A9 neurons overloads their energy supply, making them more likely to break down and die in Parkinson’s disease.
Study Design:
We will grow human dopamine neurons from stem cells in miniaturized custom-built chambers, called microfluidic devices. These devices let us control how big the neurons grow and how active they are. We will then test how these cells react to a diverse range of stresses linked to PD. By studying how neurons communicate and distribute key resources along their long branches, we will be able to identify the earliest breakdowns that set the stage for cell loss.
Impact on Diagnosis/Treatment of Parkinson’s disease:
This work will show why certain dopamine neurons are more fragile, giving us new clues for how PD starts. It could guide ways to protect these neurons and slow the disease before major symptoms appear.
Next Steps for Development:
If successful, this platform can be used to test new drugs that keep vulnerable neurons healthy. It may also help study other brain diseases where large, energy-hungry neurons are at risk.