Inflammatory Bowel Disease May Raise Parkinson's Risk

Curated by Claudia Shannon / Research Scientist / ishonest

The gut-brain axis theory proposes that what goes on in the gastrointestinal tract (GI) affects the central nervous system.

It is supported by evidence that shows that the gut and nervous system talk to each other, and that microbe activity in the gut can regulate brain chemistry.

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Publication of the Danish study comes hot on the heels of another report of an observational study conducted in the United States that found that having inflammatory bowel disease (IBD) was linked to a 28 percent higher risk of developing Parkinson’s disease.

IBD and Parkinson’s disease

IBD is a chronic condition that inflames the GI, or gut, because the immune system attacks healthy tissue cells in the intestines and the beneficial bacteria that live there.

There are two main types of IBD: ulcerative colitis, which mainly affects the colon; and Crohn’s disease, which can affect any part of the gut from the mouth to the anus.

Estimates suggest that around 3 million adults in the U.S. have been diagnosed with IBD at some time in their lives.

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IBD should not be confused with two other gut conditions: irritable bowel syndrome (IBS) and celiac disease.

Although IBS does damage the gut, the cause is not inflammation. And, while celiac disease does inflame the gut, the cause is a specific reaction to gluten, which is a protein found in wheat and other grains.

Parkinson’s disease is a gradually worsening movement disorder caused by death of brain cells. The most common symptoms include muscle rigidity, tremors, slowness of movement, and impaired coordination and balance.

It can also present with non-movement symptoms such as depression, anxiety, fatigue, disordered sleep, and gut-related problems.

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Estimates suggest that more than 10 million people worldwide have Parkinson’s disease, around 1 million of whom live in the U.S.

Gut inflammation and Parkinson’s

Dr. Brudek and his colleagues decided to investigate whether there might a link between IBD and risk of developing Parkinson’s disease or MSA.

They identified all residents of Denmark who were diagnosed with IBD between 1977 and 2014 and matched each of them to “comparable” members of the population at large who did not have IBD. Altogether, the study followed 76,477 individuals with IBD and more than 7.5 million without IBD.

The 37 years of follow-up started from day of diagnosis to “occurrence” of Parkinson’s or MSA, which was determined from records in the Danish National Patient Register.

Study does not prove causation

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The analysis revealed that people diagnosed with IBD had a 22 percent higher risk of developing Parkinson’s compared with their non-IBD counterparts.

The analysis also suggested that there might be a 41 percent higher risk of MSA in individuals with IBD compared with their non-IBD counterparts, but this was based on a very low incidence of MSA.

The researchers point out that, since theirs was an observational study, they cannot say for certain whether IBD raises the risk of Parkinson’s disease.

However, because they did find a link — and because their study is the first “epidemiological study investigating the risk of parkinsonism in an unselected, nationwide cohort of patients with IBD with long-term follow-up” — they urge that clinicians “should be aware of symptoms of parkinsonism in patients with IBD.” They also suggest that:

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