Altered Gut Microbiome Composition and Function in Individuals with Complex Regional Pain Syndrome.

Area of Science:

• Microbiology
• Immunology
• Gastroenterology

Background:

• Complex regional pain syndrome (CRPS) is a chronic pain condition with unclear mechanisms.
• CRPS involves severe pain, autonomic dysfunction, and motor symptoms, with limited treatment options.
• The gut microbiome's role in chronic pain is increasingly recognized, necessitating investigation in CRPS.

Purpose of the Study:

• To investigate the gut microbiome composition and function in individuals with CRPS.
• To compare the gut microbiomes of CRPS patients with those of healthy controls.
• To identify potential diagnostic biomarkers and therapeutic targets for CRPS within the gut microbiome.

Main Methods:

• 16S rRNA gene sequencing was used to analyze the gut microbiome composition in CRPS patients and controls.
• Targeted metabolomic analysis of fecal and plasma samples was performed to assess bacteria-derived metabolites.
• Machine learning algorithms were employed to classify CRPS patients based on their microbiome profiles.

Main Results:

• Significant differences in bacterial taxa, particularly short-chain fatty acid (SCFA)-metabolizing species, were observed between CRPS patients and controls.
• Altered levels of fecal and plasma SCFAs were confirmed in CRPS patients.
• Microbiome composition alone achieved accurate classification of CRPS patients in an independent validation cohort.

Conclusions:

• The gut microbiome exhibits unique compositional and functional alterations in individuals with CRPS.
• These findings support the gut microbiome's involvement in the pathophysiology of CRPS.
• The study suggests potential for novel diagnostic and therapeutic strategies targeting the gut microbiome in CRPS.