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ORTHOPEDICS AND TRAUMATOLOGY / CLINICAL RESEARCH
Causal relationship between 91 circulating inflammatory proteins and osteomyelitis risk: evidence from a Mendelian randomization study
1
Shanxi Medical University, Shanxi, China
2
The Second Hospital of Shanxi Medical University, Shanxi, China
3
The Fourth People’s Hospital of Taiyuan, Shanxi, China
Submission date: 2024-12-16
Final revision date: 2025-04-01
Acceptance date: 2025-04-19
Online publication date: 2025-06-08
KEYWORDS
TOPICS
ABSTRACT
Introduction:
Recent research on bone immunology highlights the role of circulating inflammatory proteins in the progression of osteomyelitis (OM). We aimed to investigate the causal relationship between circulating inflammatory protein levels and OM.
Material and methods:
We used summary statistics of 91 inflammatory cytokines (n = 14,824) to perform Mendelian randomization (MR) with two different cohorts of OM. In the discovery phase, summary statistics of OM were obtained from the FinnGen R11 database (2,125 cases vs. 429,826 controls), and the results were replicated in a larger cohort of OM from the UK Biobank study (4,836 cases vs. 481,648 controls). The results of the two MR analyses were applied to a random effects model for meta-analysis. The inverse variance-weighted (IVW) method was used as the main method for MR analysis. We conducted a series of sensitivity analyses to confirm the stability of the causal effect, and used phenotype-wide association analysis (PheWAS) to examine the potential pleiotropy in the study.
Results:
Genetic evidence suggests a causal association between CCL4 (ORIVW = 1.11, 95% CI = 1.04–1.19) and OM in different European ancestry meta-analysis results, which was confirmed by robustness in sensitivity tests and PheWAS. Additionally, osteoprotegerin, MCP-4, ADA, IL15RA, and artemin were positively associated with the risk of OM, while MCP-3, C-X-C motif chemokine 5, and C-C motif chemokine 19 were negatively associated.
Conclusions:
Our findings suggest a potential causal association between 9 inflammatory proteins and OM. However, this study is based on a European ancestry cohort. Future studies are needed to validate these associations in multi-ethnic cohorts and elucidate the biological mechanisms through experimental studies.
Recent research on bone immunology highlights the role of circulating inflammatory proteins in the progression of osteomyelitis (OM). We aimed to investigate the causal relationship between circulating inflammatory protein levels and OM.
Material and methods:
We used summary statistics of 91 inflammatory cytokines (n = 14,824) to perform Mendelian randomization (MR) with two different cohorts of OM. In the discovery phase, summary statistics of OM were obtained from the FinnGen R11 database (2,125 cases vs. 429,826 controls), and the results were replicated in a larger cohort of OM from the UK Biobank study (4,836 cases vs. 481,648 controls). The results of the two MR analyses were applied to a random effects model for meta-analysis. The inverse variance-weighted (IVW) method was used as the main method for MR analysis. We conducted a series of sensitivity analyses to confirm the stability of the causal effect, and used phenotype-wide association analysis (PheWAS) to examine the potential pleiotropy in the study.
Results:
Genetic evidence suggests a causal association between CCL4 (ORIVW = 1.11, 95% CI = 1.04–1.19) and OM in different European ancestry meta-analysis results, which was confirmed by robustness in sensitivity tests and PheWAS. Additionally, osteoprotegerin, MCP-4, ADA, IL15RA, and artemin were positively associated with the risk of OM, while MCP-3, C-X-C motif chemokine 5, and C-C motif chemokine 19 were negatively associated.
Conclusions:
Our findings suggest a potential causal association between 9 inflammatory proteins and OM. However, this study is based on a European ancestry cohort. Future studies are needed to validate these associations in multi-ethnic cohorts and elucidate the biological mechanisms through experimental studies.
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