Parkinson’s disease is a long-term brain condition that affects movement, thinking, and mood. It happens when certain brain cells, especially those that produce a chemical called dopamine, become damaged or die.
Dopamine is important because it helps control movement and coordination. As these cells are lost, people may develop symptoms such as shaking, stiffness, slow movement, and balance problems.
Although there are treatments that can help manage symptoms, there is still no cure for Parkinson’s disease. Scientists around the world are working to better understand what causes the disease and how to stop it from getting worse. A new study from Stanford Medicine offers fresh hope by focusing on a specific enzyme in the brain.
The enzyme is called LRRK2. In some people, a change in the LRRK2 gene makes this enzyme too active. This overactivity can disrupt normal brain function.
The study found that when LRRK2 is too active, it interferes with how brain cells communicate with each other, especially in an area called the striatum. This part of the brain plays an important role in movement, decision-making, and motivation.
The research was led by Dr. Suzanne Pfeffer and involved collaboration with scientists in Scotland. The findings were published in the journal Science Signaling. The team studied mice that carried the same genetic mutation seen in some people with Parkinson’s disease.
One of the key discoveries was related to tiny structures on cells called primary cilia. These structures act like antennas, allowing cells to receive important signals from their environment. When LRRK2 is overactive, many cells lose these cilia. Without them, the cells cannot receive signals properly.
One important signal that is affected is called “sonic hedgehog.” This signal helps certain brain cells release protective proteins that support the health of neurons. Without this signal, brain cells become more vulnerable to stress and damage.
In the mice with the LRRK2 mutation, the loss of cilia disrupted communication between dopamine-producing neurons and nearby support cells. This caused stress in the neurons and eventually led to their decline.
To address this problem, the researchers used a molecule called MLi-2 to block the activity of the LRRK2 enzyme. At first, they treated the mice for two weeks, but they did not see much improvement. They then extended the treatment to three months.
The longer treatment produced remarkable results. The primary cilia grew back, allowing the brain cells to receive signals again. Communication between cells improved, and the protective proteins were released once more. As a result, the stress on dopamine neurons was reduced, and signs suggested that the damaged cells were beginning to recover.
Dr. Pfeffer explained that this finding could mean more than just slowing down Parkinson’s disease. It may actually help restore some brain function if treatment is started early enough.
Parkinson’s disease often begins long before noticeable movement problems appear. Early signs can include loss of smell, constipation, and sleep disturbances, sometimes years before more obvious symptoms develop. This means there may be a window of time when treatment could prevent serious damage.
The researchers hope that, in the future, people who carry the LRRK2 mutation could receive treatment early to protect their brain cells. They are also exploring whether this approach could help people with other forms of Parkinson’s disease, not just those with this specific genetic change.
Several clinical trials are already testing drugs that block LRRK2 in humans. If these treatments prove to be safe and effective, they could offer a new way to treat Parkinson’s disease and possibly other related brain conditions.
This study was supported by The Michael J. Fox Foundation, the Aligning Science Across Parkinson’s initiative, and the UK Medical Research Council. It represents an important step forward in understanding how to protect brain cells and improve the lives of people living with Parkinson’s disease.
If you care about Parkinson’s disease, please read studies about Vitamin E that may help prevent Parkinson’s disease, and Vitamin D could benefit people with Parkinson’s disease.
For more information about brain health, please see recent studies about new way to treat Parkinson’s disease, and results showing COVID-19 may be linked to Parkinson’s disease.
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