- Scientists have discovered that heart disease causes brain dysfunction that could lead to dementia before the buildup of plaque in blood vessels of the brain
- Heart disease causes problems in the brain that causes less blood to reach the neurons that need it
- Findings also show that a combination of heart disease and a key Alzheimer鈥檚 gene trebles the amount of an Alzheimer鈥檚 causing protein in the brain
Heart disease can directly cause brain dysfunction early on which could lead to dementia and can treble the amount of an Alzheimer鈥檚 protein in the brain, say scientists.
The new research, published in eLife, has found that heart disease causes a breakdown of a key brain function which links brain activity and blood flow, meaning the brain gets less blood for the same amount of activity.
This is happening in heart disease patients before the build up of fat in the brain鈥檚 blood vessels (atherosclerosis) and is a prelude to dementia. Until now it has been unclear how some forms of vascular dementia can happen years before atherosclerosis in the brain.
The researchers also discovered that the combination of heart disease and a genetic predisposition for Alzheimer鈥檚 Disease trebles the amount of beta-amyloid, a protein that builds up and triggers Alzheimer鈥檚, and increases the levels of an inflammatory gene (IL1) in the brain.
Alzheimer鈥檚 Disease is the most common form of dementia worldwide and heart disease is a major risk factor for both Alzheimer鈥檚 and dementia. The new findings are key to furthering our understanding of the links between heart disease and dementia.
"We鈥檝e discovered that heart disease in midlife causes the breakdown of neurovascular coupling, an important mechanism in our brains which controls the amount of blood supplied to our neurons. This breakdown means the brain doesn鈥檛 get enough oxygen when needed and in time this can lead to dementia.鈥
Dr Osman Shabir
Lead author of the study from the University of 91直播鈥檚 Neuroscience and Healthy Lifespan Institutes
The team have since been awarded a three year grant by the British Heart Foundation to look at the use of an arthritis drug which targets IL1 to see if it could reverse or reduce the brain dysfunction seen to be caused by heart disease.
The team also found that brain injuries can also worsen brain blood flow regulation, supporting observations that patients鈥 symptoms often worsen after injuries or falls.
