Scientists are continuing to search for better ways to treat Parkinson’s disease, a condition that slowly damages the brain and affects movement, mood, and thinking.
Now, a study led by researchers at Stanford Medicine has found that switching off a specific enzyme may help protect brain cells and possibly slow the disease.
Parkinson’s disease is one of the most common brain disorders, especially in older adults. It develops when certain brain cells, known as dopamine-producing neurons, begin to die.
These cells are important because they help control movement, motivation, and decision-making. As they are lost, people may develop symptoms such as shaking, stiffness, slow movement, and later, memory problems.
In some cases, Parkinson’s disease is linked to genetic changes. One of the most important genes involved is called LRRK2. In people with a mutation in this gene, the enzyme it produces becomes too active. This overactivity can interfere with normal brain function and lead to damage over time.
The new study, led by Dr. Suzanne Pfeffer, focused on what happens when this enzyme becomes too active. The research was published in the journal Science Signaling and involved a collaboration with scientists in Scotland. The team used specially designed mice that carried the same genetic mutation found in some people with Parkinson’s disease.
The researchers discovered that when the LRRK2 enzyme is overactive, it disrupts communication between brain cells. This problem mainly affects an area deep in the brain called the striatum. This region plays a key role in controlling movement and behavior.
One of the most surprising findings was related to tiny structures on cells called primary cilia. These structures act like small antennas. They help cells receive signals from their surroundings and respond to important chemical messages. When the enzyme is too active, many cells in the striatum lose these cilia.
Without these antenna-like structures, the cells cannot receive signals properly. One important signal, often called the “sonic hedgehog” signal, helps cells produce protective substances that keep brain cells alive. When this signal is lost, the support system for neurons becomes weaker, and the neurons are more likely to become damaged and die.
To try to fix this problem, the researchers used a compound called MLi-2, which can block the activity of the LRRK2 enzyme. At first, they treated the mice for two weeks, but they did not see any clear improvement.
However, they did not give up. Based on earlier research suggesting that cells may need more time to rebuild their structures, they extended the treatment to three months.
After this longer treatment, the results were much more promising. The cells began to regrow their cilia, allowing them to receive signals again.
Communication between brain cells improved, and the protective signals were restored. As a result, the stress on dopamine-producing neurons decreased, and signs showed that some damaged neurons were beginning to recover.
These findings are important because they suggest that blocking the LRRK2 enzyme may not only slow the disease but could also help improve brain function. This is especially exciting because Parkinson’s disease often begins many years before the most obvious symptoms appear.
Early signs can include loss of smell, digestive problems such as constipation, and sleep disturbances. These symptoms can appear up to 15 years before movement problems start.
Dr. Pfeffer believes that if people who carry the LRRK2 mutation can be identified early, they may be able to start treatment before serious damage occurs. This could change the way Parkinson’s disease is managed in the future.
The research team is now working to find out whether this approach could also help people with other forms of Parkinson’s disease, not just those with the specific genetic mutation. Several clinical trials are already testing drugs that block LRRK2 in humans, which means this research could soon have real-world impact.
The study was supported by major organizations, including The Michael J. Fox Foundation, the Aligning Science Across Parkinson’s initiative, and the UK Medical Research Council. These groups are working together to find better treatments and, one day, a cure for Parkinson’s disease.
While more research is needed, this study offers new hope. By restoring how brain cells communicate and protecting neurons from damage, scientists may be moving closer to a future where Parkinson’s disease can be slowed, managed more effectively, or even prevented.
If you care about Parkinson’s disease, please read studies that Vitamin B may slow down cognitive decline, and Mediterranean diet could help lower risk of Parkinson’s.
For more information about brain health, please see recent studies that blueberry supplements may prevent cognitive decline, and results showing Plant-based diets could protect cognitive health from air pollution.
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