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An Adoptive Transfer Model of Rheumatoid Arthritis in Mice
Published on: June 6, 2025
967
C-Reactive Protein Mediates the Association Between Rheumatoid Arthritis and Immune Thrombocytopenia: An
Wuxia Yang1, Zhen Wang2, Yanqi Song3
1Tianjin Medical University, Tianjin, China.
Scandinavian Journal of Immunology
|December 18, 2025
Summary
Rheumatoid arthritis (RA) significantly increases the risk of immune thrombocytopenia (ITP). C-reactive protein (CRP) partially mediates this association, highlighting a potential therapeutic target for patients with RA.
Area of Science:
- Rheumatology
- Immunology
- Genetics
Background:
- Thrombocytopenia, specifically immune thrombocytopenia (ITP), is increasingly observed in patients with rheumatoid arthritis (RA).
- The causal link between RA and ITP risk, and the potential mediating factors, remain incompletely understood.
- Understanding this relationship is crucial for managing RA complications and improving patient outcomes.
Purpose of the Study:
- To investigate the causal effect of rheumatoid arthritis (RA) on the risk of developing immune thrombocytopenia (ITP).
- To evaluate the potential mediating role of C-reactive protein (CRP) in the RA-ITP relationship.
- To provide evidence for targeted interventions in RA patients at risk for ITP.
Main Methods:
- Combined a cross-sectional survey using National Health and Nutrition Examination Survey (NHANES) data (2003-2018) with two-sample Mendelian randomisation (MR) analyses.
- Utilized multivariable logistic regression for observational analysis of RA and ITP association.
- Employed single-nucleotide polymorphisms (SNPs) as instrumental variables in MR analyses to assess causality and mediation by CRP.
Main Results:
- Observational analysis revealed a significant positive association between RA and ITP (OR = 2.92, 95% CI: 1.93-4.44, p < 0.001), consistent across subgroups.
- Mendelian randomisation indicated a positive causal effect of genetically predicted RA on ITP risk (OR = 1.218, 95% CI: 1.093-1.356, p < 0.05).
- Mediation analysis estimated that CRP accounts for approximately 9% (95% CI: 3%-17%) of the total effect between RA and ITP.
Conclusions:
- Rheumatoid arthritis is causally associated with an increased risk of immune thrombocytopenia.
- C-reactive protein partially mediates the relationship between RA and ITP.
- These findings underscore the importance of monitoring platelet counts in RA patients and suggest CRP as a potential therapeutic target.
Keywords:
C‐reactive proteinNHANESgenetic correlation analysisimmune thrombocytopeniamendelian randomisationrheumatoid arthritisMore Related Videos
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