In Parkinson’s disease, only one specific group of dopamine neurons dies—those in the substantia nigra—while their neighbours in the ventral tegmental area survive almost untouched. This selective vulnerability is a central puzzle. The disease can be triggered by genetic mutations that produce toxic proteins, or by environmental neurotoxins, but it remains unclear why only substantia nigra neurons succumb. The researchers will grow both types of human dopamine neurons in a dish, using stem cells derived from Parkinson’s patients. By exposing these cultured neurons to the same toxic insults and comparing their responses, they aim to pinpoint what makes substantia nigra cells uniquely sensitive. If successful, this work could reveal which environmental compounds pose the greatest risk for developing Parkinson’s, and identify the molecular pathways that drive selective cell death. That knowledge might eventually guide the design of protective therapies or risk assessments for industrial chemicals. For now, the research is fundamental science—it asks a basic question about why certain brain cells die while others do not. Similar curiosity-driven work on neuronal vulnerability has, in the past, uncovered mechanisms that later became targets for drugs slowing neurodegeneration.
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In neurodegenerative diseases certain classes of highly sensitive neuronal populations die. This is also the case in Parkinson’s disease, where only dopamine neurons that are located in a region called the substantia nigra (SN) degenerate. Dopamine neurons that are located in the neighbouring ventral tegmental area (VTA) are almost not affected. Parkinson’s disease can be caused by a mutation in a gene that results in the production of a toxic protein or by neurotoxins that are present in the environment. However, it is not so clear why the dopamine neurons located in the SN are much more sensitive to environmental toxicity than VTA neurons. In our research we will investigate why only SN neurons are affected by these toxic insults. The use of human embryonic stem (ES) and induced pluripotent stem (iPS) cell technologies will allow us to culture SN and VTA dopaminergic neurons in a dish. Human ES and iPS cells are pluripotent, meaning that they have the ability to generate different cell types upon differentiation. The iPS cells that we will use are derived from patients with Parkinson’s disease Enriched cultures of SN neurons will allow us to examine specifically the neurons that degenerate in Parkinson’s disease in vitro. We will analyse the response of these neurons to toxic insults and compare them to other dopamine neurons that do not degenerate in the disease. This will give us novel insights into the selective sensitivity of SN neurons and will reveal the potential risks of environmental compounds in developing Parkinson’s disease.
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