Silent stroke can lead to Parkinson’s disease
Washington: Whilst conditions such as a severe stroke have been linked to Parkinson’s disease, for many sufferers the tremors and other symptoms of the disease can appear to come out of the blue.
Scientists at The University of Manchester have discovered that a small stroke, also known as a silent stroke, can cause Parkinson’s disease.
Unlike a severe stroke, a silent stroke can show no outward symptoms of having taken place. It happens when a blood vessel in the brain is blocked for only a very short amount of time and often a patient won’t know they have suffered from one.
However, it now appears one of the lasting effects of a silent stroke can be the death of dopaminergic neurons in the substantia nigra in the brain, which is an important region for movement coordination.
“At the moment we don’t know why dopaminergic neurons start to die in the brain and therefore why people get Parkinson’s disease. There have been suggestions that oxidative stress and aging are responsible. What we wanted to do in our study was to look at what happens in the brain away from the immediate area where a silent stroke has occurred and whether that could lead to damage that might result in Parkinson’s disease,” said Dr. Emmanuel Pinteaux, who led the research.
The researchers at the university’s Faculty of Life Sciences induced a mild stroke similar to a silent stroke in the striatum area of the brain in mice. They found there was inflammation and brain damage in the striatum following the stroke, which they had expected. What the researchers didn’t expect was the impact on another area of the brain, the substantia nigra.
When they analysed the substantia nigra they recorded a rapid loss of Substance P (a key chemical involved in its functions) as well as inflammation.
The team then analysed changes in the brain six days after the mild stroke and found neurodegeneration in the substantia nigra. Dopaminergic neurones had been killed.
Talking about the findings Dr Pinteaux said: “It is well known that inflammation following a stroke can be very damaging to the brain. But what we didn’t fully appreciate was the impact on areas of the brain away from the location of the stroke.”
“Our work identifying that a silent stroke can lead to Parkinson’s disease shows it is more important than ever to ensure stroke patients have swift access to anti-inflammatory medication. These drugs could potentially either delay or stop the on-set of Parkinson’s disease,” he noted.
Their findings have been published in the journal “Brain Behaviour and Immunity”.