Parkinson’s disease is a progressive nervous system disorder that affects movement. While the exact cause of the condition is unclear, experts believe that genetic changes and environmental factors, such as toxins, may play a role in increasing a person’s risk of developing Parkinson’s. More recently, studies have shown that the gut could play a major role in the development of Parkinson’s. A new study led by researchers at Beth Israel Deaconess Medical Center (BIDMC) has suggested that damage to the upper gastrointestinal tract may increase Parkinson’s risk by 76%.
According to the Parkinson’s Foundation, a million people in the U.S. are currently living with Parkinson’s disease, and this number is expected to rise to 1.2 million by 2030. While age is considered the most significant risk factor for Parkinson’s disease, around 4% of cases are diagnosed in people under the age of 50. Experts do not know the exact cause of the condition, but some cases are thought to be hereditary, with specific gene variants leading to Parkinson’s disease. However, most cases appear to result from a combination of genetic and environmental factors.
The researchers at BIDMC conducted a study involving 18,305 people who had undergone endoscopy and biopsy investigations between 2000 and 2005. Of these participants, 9,350 took part in the study. The researchers followed up with all participants until they were diagnosed with Parkinson’s disease, died, were lost to follow-up, or until the final date of follow-up assessments on July 31, 2023. In total, 100 people were diagnosed with Parkinson’s disease during follow-up, with a higher percentage of these individuals having evidence of mucosal disease (MD) on endoscopy.
The study findings showed that individuals with MD of the upper gastrointestinal tract had a 76% higher risk of developing Parkinson’s disease compared to those without this diagnosis. The researchers also found that participants who developed Parkinson’s were more likely to have experienced constipation, acid reflux, and dysphagia. These symptoms have previously been associated with Parkinson’s disease. Studies have suggested that aggregations of a protein called alpha-synuclein in the brain form Lewy bodies, leading to the loss of dopaminergic neurons, which is a key feature of Parkinson’s disease. These alpha-synuclein aggregations have also been detected in the gut.
The study adds further evidence to support the gut-first hypothesis of Parkinson’s disease, which suggests that gastrointestinal dysfunction may trigger the condition. The findings align with previous research indicating that misfolded alpha-synuclein proteins may spread from the gut to the brain via the vagus nerve, supporting the idea that Parkinson’s may originate in the gut. The researchers emphasized the importance of maintaining gut health to potentially reduce the risk of developing Parkinson’s disease.
The researchers also raised further questions about the gut-brain connection in Parkinson’s and are continuing to investigate the potential mechanisms linking gut pathology to the development of the disease. Suggestions for reducing the risk of Parkinson’s disease include lifestyle measures such as exercise, healthy diet, avoiding toxins, and moderate consumption of coffee or tea. Overall, the study highlights the importance of understanding the role of the gut in Parkinson’s disease and the potential for future interventions targeting gut health to prevent or delay the onset of the condition.
