Gut microenvironmental changes as a potential trigger in Parkinson's disease through the gut-brain axis

Area of Science:

• Neuroscience
• Gastroenterology
• Genetics

Background:

• Parkinson's disease (PD) is a neurodegenerative disorder characterized by motor symptoms and alpha-synuclein aggregation.
• PD pathogenesis involves genetic predisposition, immune responses, protein aggregation, and mitochondrial dysfunction.
• The gut-brain axis and altered gut microenvironment are implicated in PD development.

Purpose of the Study:

• To review the interplay between genetic factors and gut microenvironmental changes in Parkinson's disease pathogenesis.
• To explore the hypothesis that an altered gut microenvironment triggers PD in genetically susceptible hosts.

Main Methods:

• Review of existing neuropathology studies.
• Analysis of evidence on gut microbiome and metabolite differences in PD patients.
• Examination of findings on gut inflammation and barrier integrity in PD.

Main Results:

• Evidence suggests Lewy bodies may originate in the enteric nervous system and spread via the gut-brain axis.
• Distinct gut microbiomes and metabolites are observed in PD patients compared to controls.
• Chronic gut inflammation and impaired intestinal barrier integrity are noted in PD.

Conclusions:

• An altered gut microenvironment is a potential trigger for Parkinson's disease in genetically susceptible individuals.
• Understanding the gut-brain axis is crucial for elucidating PD pathogenesis.