Scientists may have found a way to help brain cells fight back against Parkinson’s disease instead of simply slowing the symptoms.
In research published in Science Signaling, a team from Stanford Medicine restored important communication between brain cells in mice by switching off a harmful enzyme.
The discovery could open the door to treatments that work much earlier in the disease.
Parkinson’s disease happens when special nerve cells in the brain gradually stop working and die.
These cells make dopamine, which is needed for smooth body movement and many other brain functions. As dopamine levels fall, people can develop tremors, slow movement, poor balance, and muscle stiffness.
Doctors have known for years that some families inherit changes in a gene called LRRK2. These gene changes make the LRRK2 enzyme much more active than normal. Scientists have suspected that this overactivity damages brain cells, but exactly how this happens has remained uncertain.
The new study uncovered an important piece of the puzzle. Healthy brain cells rely on tiny structures called primary cilia that receive chemical signals from nearby cells. The researchers found that the overactive enzyme causes many of these tiny structures to disappear.
Without primary cilia, brain cells lose contact with protective signals. One of the most important comes from a protein known as sonic hedgehog, which helps surrounding support cells produce molecules that keep dopamine-producing neurons healthy. Losing this signal leaves brain cells more vulnerable to damage.
The team treated mice carrying the faulty gene with a compound known as MLi-2. A short treatment did not produce noticeable improvements. However, after giving the medicine for three months, the scientists observed a remarkable recovery.
The tiny primary cilia grew back, allowing brain cells to receive protective messages once again. Communication between important brain regions improved, and damaged dopamine neurons showed signs of healing. These changes suggested that the disease process could be slowed or partly reversed during its early stages.
The work is especially important because Parkinson’s disease often develops quietly for many years before the first tremor appears. Early warning signs can include constipation, sleep problems, and a poor sense of smell. Finding people during this hidden stage could make future treatments much more effective.
Researchers are now asking whether the same strategy might help people with other forms of Parkinson’s disease that are not caused by LRRK2 mutations. Because drugs that block this enzyme are already being tested in clinical trials, this research may speed the development of future therapies.
The findings are exciting because they suggest damaged brain cells may recover if harmful signals are stopped early enough. However, this remains an early-stage animal study, and many treatments that succeed in mice do not always work in people.
Future human studies will determine whether LRRK2 inhibitors can safely protect the brain and delay Parkinson’s disease. If successful, this approach could shift treatment from managing symptoms to preserving brain cells before permanent damage occurs.
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 health information, please see recent studies that blueberry supplements may prevent cognitive decline, and results showing Plant-based diets could protect cognitive health from air pollution.
Source: Stanford Medicine.
