Changes in gut microbiota and plasma metabolites in Parkinson’s disease patients with pain as analyzed by 16S rDNA sequencing and LC-MS

Sep 14, 2025Brain research

Changes in gut bacteria and blood chemicals in Parkinson’s patients with pain

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Abstract

Significant differences in gut microbiota and plasma metabolites were found among 64 Parkinson's disease patients with pain, 36 non-Parkinson's individuals with pain, and 50 healthy controls.

Specific gut bacteria, such as Bacteroidales and Faecalibacterium prausnitzii, showed notable differences between the Parkinson's disease patients with pain and the other groups.
Bacterial functions were mainly linked to carbohydrate, amino acid, and energy metabolism.
Plasma metabolite analysis revealed 16 metabolites that differed between non-Parkinson's individuals with pain and Parkinson's disease patients with pain.
Key metabolites included 12-ketodeoxycholic acid, dihydroouabain, and lysophosphatidic acid.
A negative correlation was found between lysophosphatidic acid and Faecalibacterium, while 12-ketodeoxycholic acid positively correlated with Clostridium and Romboutsia.

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Pain is a common non-motor symptom of Parkinson's disease (PD) that significantly impacts patients' quality of life. Recently, the role of the gut-brain axis in the pathogenesis of PD has garnered considerable attention. However, the relationship between gut microbiota-induced changes in plasma metabolites and PD-associated pain remains poorly understood. To address this, we analyzed 64 PD patients with pain (PDP), 36 non-PD individuals with pain (nPDP), and 50 healthy controls (HC). Using 16S rDNA gene sequencing and ultra-high-performance liquid chromatography-tandem mass spectrometry (LC-MS), we characterized and compared the gut microbiota and plasma metabolite profiles across these groups. Additionally, correlation analyses were conducted to identify meaningful associations between microbial and metabolite data. Our findings revealed significant differences among the PDP, nPDP, and HC groups, particularly in taxa such as Bacteroidales, Gammaproteobacteria, and Faecalibacterium prausnitzii. KEGG function prediction indicated that bacterial colony function was primarily related to carbohydrate metabolism, amino acid metabolism, and energy metabolism. Plasma metabolomic analysis identified 16 differentially accumulated metabolites between the nPDP and PDP groups, with notable contributions from 12-ketodeoxycholic acid (12-KCAc), dihydroouabain (DHO), and lysophosphatidic acid (LysoPA). Furthermore, a significant negative correlation was observed between LysoPA and Faecalibacterium, while 12-ketodeoxycholic acid exhibited a positive correlation with Clostridium and Romboutsia. This study suggests that PDP patients have distinct gut microbiota and metabolic profiles, which may contribute to the pain experience in PD patients. These divergent microbial and metabolite signatures may provide insight into potential mechanisms linking the gut-brain axis to pain in PD.

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