# The Gut Microbiota in Parkinson’s Disease: Mechanistic Insights into Microbial–Host Interactions

## TL;DR

This review explores how gut microbes may influence Parkinson's disease through immune and metabolic changes, potentially leading to brain pathology.

## Contribution

The paper proposes a unified model linking gut microbiota to Parkinson's disease through immune and metabolic mechanisms.

## Key findings

- PD-associated gut dysbiosis reduces short-chain fatty acid production and increases pro-inflammatory traits.
- Microbial changes promote intestinal inflammation and may facilitate α-synuclein aggregation in the gut.
- Current therapies do not halt neurodegeneration, highlighting the need for microbiota-targeted interventions.

## Abstract

Parkinson’s disease (PD) is a multifactorial neurodegenerative disorder characterized by progressive motor and non-motor manifestations, including early gastrointestinal dysfunction. Growing evidence implicates the gut microbiota as an active modulator of host immune tone and neurodegenerative vulnerability, extending beyond descriptive taxonomic associations toward functional and metabolic mechanisms. PD-associated dysbiosis is consistently characterized by altered microbial functional capacity, including reduced short-chain fatty acid (SCFA) production, enrichment of pro-inflammatory metabolic traits, and sustained immune stimulation at the intestinal interface. These shifts promote chronic low-grade inflammation and intestinal barrier perturbations, creating conditions that may facilitate abnormal α-synuclein aggregation within the enteric nervous system. Current management predominantly relies on dopaminergic replacement and related symptomatic strategies, such as levodopa combinations, dopamine agonists, monoamine oxidase-B and catechol-O-methyltransferase (COMT) inhibitors, and device-aided therapies, which alleviate symptoms but do not halt underlying neurodegeneration or modify long-term disease course. These therapeutic limitations have intensified interest in upstream mechanisms that might be amenable to disease-modifying interventions, particularly those arising at the level of the gut microbiota and gut–immune–brain axis. This narrative review integrates clinical, metagenomic, metabolomic, and mechanistic evidence to propose a unified model in which microbiota-driven immune and metabolic perturbations may act as upstream drivers converging on α-synuclein pathology, neuroinflammation, and neurovascular dysfunction.