New research suggests a surprising link between oral health and the progress of Parkinson’s disease, a neurodegenerative disorder affecting millions globally. A study from Pohang University of Science & technology in south korea has identified an elevated presence of Streptococcus mutans, a bacteria commonly associated with tooth decay, in the gut of Parkinson’s patients. These findings open a new avenue of examination into potential preventative strategies for a disease currently without a cure, and highlight the complex interplay between the gut microbiome and brain health.
A common bacteria linked to tooth decay may play a role in the development of Parkinson’s disease, according to new research. This finding offers a potential new avenue for preventing the neurodegenerative disorder, which affects millions worldwide and currently has no cure.
Researchers at Pohang University of Science & Technology in South Korea discovered an elevated presence of Streptococcus mutans – a key contributor to cavities – in the gut of Parkinson’s disease patients. The bacteria, typically found in the mouth, appears to not only survive in the intestinal environment but also integrate into gut metabolic processes.
A Key Metabolite: Imidazole Propionate
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Further analysis revealed that Streptococcus mutans produces a small molecule called imidazole propionate within the gut. While previous studies have connected imidazole propionate to metabolic disorders, its impact on the nervous system was largely unknown. The enzyme responsible for producing imidazole propionate, urocanate reductase, was also found at higher levels in both the gut and blood of Parkinson’s patients, suggesting a potential buildup of the metabolite within the body.
In animal studies, introducing Streptococcus mutans into the gut of mice led to the accumulation of imidazole propionate and the development of brain changes characteristic of Parkinson’s disease. These included damage to nerve cells, chronic inflammation, and the abnormal clumping of proteins within neurons. The mice also exhibited noticeable motor impairments, demonstrating a link between gut metabolism and neurological health.
mTORC1: A Link Between Gut and Neurodegeneration
At the molecular level, researchers found that imidazole propionate stimulates protein synthesis signaling within nerve cells, leading to protein misfolding and subsequent inflammation. Importantly, inhibiting the key signaling protein mTORC1 with medication lessened both the nerve damage and motor dysfunction in the mice. This suggests mTORC1 may be a crucial pathway through which gut metabolic signals contribute to brain disease.
These findings reshape our understanding of Parkinson’s disease risk factors, suggesting that oral and gut bacteria may contribute to the condition alongside aging and genetics. While a direct link between cavities and Parkinson’s disease hasn’t been established, the long-term effects of gut metabolites on the nervous system warrant further investigation. Focusing on oral hygiene and gut microbiome health could potentially offer new strategies for Parkinson’s disease prevention.
（首圖來源：Unsplash）
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