Gut microbial and metabolic alterations, including reduced diversity, increased Alistipes, decreased Prevotella, and lower short-chain fatty acid concentrations, are associated with osteoporotic vertebral compression fracture status rather than osteoporosis alone.
Key Findings
Results
The OVCF group exhibited more distinct gut microbial compositional differences and reduced microbial diversity compared with healthy controls and osteoporosis patients.
Study included 29 healthy controls, 11 patients with osteoporosis, and 25 patients with OVCF
Fecal microbiome profiling was performed using 16S rRNA gene sequencing
The OVCF group showed reduced microbial diversity relative to both comparison groups
Microbial compositional differences in OVCF were more distinct than those observed in the osteoporosis-only group
Results
Alistipes was found at increased relative abundance in the OVCF group and showed a negative correlation with bone mineral density.
Differential abundance analyses identified Alistipes as enriched in the OVCF group compared with healthy controls and osteoporosis patients
Alistipes abundance showed a negative correlation with BMD
This finding was identified through differential abundance analyses as part of 16S rRNA-based profiling
Results
Prevotella was found at higher relative abundance in healthy controls and showed a positive correlation with bone mineral density.
Prevotella was identified as enriched in the healthy control group relative to OVCF patients
Prevotella abundance showed a positive correlation with BMD
This contrasting pattern with Alistipes suggests opposing microbial roles in bone metabolism
Results
Fecal short-chain fatty acid concentrations were significantly lower in the OVCF group, accompanied by reduced abundance of short-chain fatty acid-producing taxa.
SCFA concentrations were significantly lower in OVCF patients compared with the other groups
Reduced abundance of SCFA-producing microbial taxa was observed in the OVCF group
Alterations in SCFA-related microbial pathways were also detected through functional profiling
SCFAs are recognized as potential regulators of bone metabolism
Results
Functional microbial profiling suggested differences in metabolic pathways associated with OVCF, including increased mucin-derived carbohydrate degradation and reduced polyamine metabolism.
Increased mucin-derived carbohydrate degradation pathways were observed in the OVCF group
Reduced polyamine metabolism pathways were identified in the OVCF group
These pathway differences were identified through functional profiling of the 16S rRNA sequencing data
These metabolic alterations were described as consistent with the observed taxonomic differences
Background
Fracture occurrence in osteoporosis cannot be fully explained by bone mineral density alone, suggesting additional systemic factors such as the gut microbiome contribute to fracture susceptibility.
OVCF is associated with pain, disability, and impaired quality of life
Osteoporosis is commonly diagnosed based on BMD, but BMD alone does not fully account for fracture risk
The gut microbiome has emerged as a potential regulator of bone metabolism
The authors note that the association between gut microbiome and OVCF specifically remained insufficiently characterized prior to this study
Conclusions
The identified microbial signatures provide preliminary evidence of OVCF-associated microbial alterations, but further validation in independent cohorts and longitudinal studies is required before diagnostic or predictive value can be established.
Authors explicitly state that findings require validation in independent cohorts
Longitudinal studies are called for before diagnostic or predictive value can be established
The study design was cross-sectional with a relatively small sample size (total n = 65)
Findings are described as 'preliminary evidence' of OVCF-associated microbial alterations
What This Means
This research suggests that people with osteoporotic vertebral compression fractures (spinal fractures caused by weakened bones) have a distinctly different gut bacterial community compared to both healthy individuals and people with osteoporosis who have not fractured. The study compared stool samples from 65 participants across three groups using DNA sequencing to identify which bacteria were present. People with fractures had less diversity in their gut bacteria overall, higher levels of a bacterium called Alistipes (which was linked to lower bone density), and lower levels of Prevotella (which was linked to higher bone density).
The study also found that people with fractures had significantly lower levels of short-chain fatty acids in their stool — chemicals produced when gut bacteria break down certain foods — along with fewer of the bacteria that make these compounds. Short-chain fatty acids are thought to play a role in regulating bone health, among other functions. Additionally, the metabolic activities of the gut bacteria differed, with fracture patients showing more breakdown of mucus-related sugars and less activity in pathways that produce polyamines, which are compounds involved in cell growth and tissue maintenance.
This research suggests that the gut microbiome may be involved in fracture risk beyond what bone density measurements alone can capture, potentially opening new avenues for understanding why some people with osteoporosis fracture while others do not. However, the study was small and cross-sectional, meaning it cannot determine whether these microbial differences cause fractures, result from them, or are linked through some other factor. The authors emphasize that these are preliminary findings requiring confirmation in larger, longer-term studies before they could be used for diagnosis or prediction.
Jo S, Seo H, Shuvo M, Ahmed I, Kim S, Jeong J, et al.. (2026). Gut Microbiome Signatures Associated with Osteoporotic Vertebral Compression Fracture.. International journal of molecular sciences. https://doi.org/10.3390/ijms27198468