[Nov 19, 2022: Sam Jeremic, Edith Cowan University]
A novel, disease-modifying therapy for Alzheimer’s disease may involve the whole exchange of blood. (CREDIT: Creative Commons)
People with gut disorders may be at greater risk of developing Alzheimer’s Disease (AD).
A world-first Edith Cowan University (ECU) study has confirmed the link between the two, which could lead to earlier detection and new potential treatments.
AD destroys memory and thinking ability and is the most prevalent form of dementia.
It has no known curative treatments and is expected to affect more than 82 million people and cost US$2 trillion by 2030.
ECU’s Centre for Precision Health has now provided new insights into these relationships by confirming a genetic link between AD and multiple gut disorders.
The study analyzed large sets of genetic data from AD and several gut-disorder studies – each of about 400,000 people.
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The team discovered people with AD and gut disorders have genes in common - which is important for many reasons.
“The study provides a novel insight into the genetics behind the observed co-occurrence of AD and gut disorders,” Dr. Adewuyi said.
Centre for Precision Health director and study supervisor Professor Simon Laws said while the study didn’t conclude gut disorders cause AD or vice versa, the results are immensely valuable.
“These findings provide further evidence to support the concept of the ‘gut-brain’ axis, a two-way link between the brain’s cognitive and emotional centers, and the functioning of the intestines,” Professor Laws said.
Is cholesterol a key?
When researchers conducted further analysis into the shared genetics, they found other important links between AD and gut disorders – such as the role cholesterol may play.
Dr. Adewuyi said abnormal levels of cholesterol were shown to be a risk for both AD and gut disorders.
Professor Simon Laws. (CREDIT: Edith Cowan University)
“Whilst further study is needed into the shared mechanisms between the conditions, there is evidence high cholesterol can transfer into the central nervous system, resulting in abnormal cholesterol metabolism in the brain.
Clusters of significantly enriched biological pathways for AD and GERD. (CREDIT: Communications Biology)
“For example, elevated cholesterol in the brain has been linked to brain degeneration and subsequent cognitive impairment.”
Hope for the future
The cholesterol link could prove vital in treating AD in the future.
While there are currently no known curative treatments, the study’s findings suggest cholesterol-lowering medications (statins) could be therapeutically beneficial in treating both AD and gut disorders.
“Evidence indicates statins have properties which help reduce inflammation, modulate immunity, and protect the gut,” Dr. Adewuyi said.
However, he said there was a need for more studies and patients needed to be assessed individually to judge whether they would benefit from statin use.
The research also indicated diet could play a part in treating and preventing AD and gut disorders.
'A large-scale genome-wide cross trait analysis reveals shared genetic architecture between Alzheimer's disease and gastrointestinal tract disorders' was published in Communications Biology.
Note: Materials provided above by Edith Cowan University. Content may be edited for style and length.