Gut microbiome dysbiosis implicates the gut-bone axis in Modic changes: a metagenomic case-control study

Area of Science:

• Microbiology
• Gastroenterology
• Orthopedics

Background:

• Modic changes (MCs) are vertebral lesions associated with discogenic low back pain (LBP).
• The pathogenesis of MCs is poorly understood, with emerging links between gut dysbiosis and systemic inflammation.
• The role of gut microbiome in MC development has not been previously investigated.

Purpose of the Study:

• To characterize the gut microbiome composition in patients with MCs.
• To identify specific microbial and metabolic features associated with MCs.
• To explore the relationship between gut microbiome alterations and MC severity.

Main Methods:

• A case-control study utilizing shotgun metagenomic sequencing on fecal samples from 31 MC patients and 25 healthy controls.
• Analysis of microbial alpha and beta diversity, differential taxa abundance, and functional pathways (KEGG).
• Correlation analysis between microbial features and clinical markers like C-reactive protein (CRP) and Pfirrmann grade.

Main Results:

• Patients with MCs exhibited significantly reduced gut microbial alpha diversity compared to controls.
• Distinct microbial communities were observed between MC patients and controls, with specific taxa like *unclassified_Parabacteroides* and *Bacteroides uniformis* identified as discriminative.
• Enrichment of quorum sensing and glycerolipid metabolism pathways was found in MC patients, correlating with elevated CRP and higher Pfirrmann grade.

Conclusions:

• Gut microbial dysbiosis is associated with MCs, characterized by decreased diversity and altered metabolic pathways.
• These findings suggest a potential role for the gut-bone axis in the pathogenesis of MCs.
• The study highlights potential novel microbial and metabolic targets for diagnosing and treating LBP associated with MCs.