The gut microbiota consists of thousands of microbial species sharing a symbiotic relationship with the human host. These microorganisms have a well-defined role in maintaining optimal function through various avenues including metabolism and immunomodulation. A literature search was accomplished using Google Scholar, MEDLINE, PubMed, and relevant articles were nonsystematically reviewed. In states of dysregulation termed dysbiosis, the gut microbiota may play a role and can lead to various pathologies. Interestingly, pathological states are not entirely limited to the gut and have the potential to affect other systems. Notably, dysbiosis has been linked to several neurological pathologies, including Parkinson's disease (PD). Hallmarks of Parkinson's include buildup of Lewy bodies mediated by α-synucleinopathies, aggregation of misfolded proteins, and mitochondrial dysfunction, resulting in various motor and gastrointestinal dysfunctions. The gut microbiota is implicated in contributing to this pathology through communication via the gut–brain axis. While there have been preliminary findings indicating the potential for a causal role of the gut microbiota in PD, further research is required before making solid conclusions.
Key-words:
Dysbiosis - gut microbiota - Parkinson's disease
