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Exploring the Relationship Between 91 Inflammatory Cytokines and IgA Nephropathy Using a Two-Sample Mendelian
Manyi Wu1, Xingxin Yang1, Mengxiao Zou1
1Department of Nephrology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
Mediators of Inflammation
|May 5, 2025
Summary
This study reveals that transforming growth factor-alpha (TGF-alpha), leukemia inhibitory factor (LIF), and C-C motif chemokine 19 (CCL19) may causally increase the risk of IgA nephropathy (IgAN). CCL19 was notably upregulated in IgAN kidney tissues, suggesting its role in disease development.
Area of Science:
- Immunology
- Genetics
- Nephrology
Background:
- Previous research suggests associations between inflammatory cytokines and IgA nephropathy (IgAN).
- The precise causal relationships between specific cytokines and IgAN remain incompletely understood.
- Investigating these links is crucial for understanding IgAN pathogenesis.
Purpose of the Study:
- To conduct a comprehensive causal analysis between 91 circulating cytokines and IgA nephropathy (IgAN).
- To identify specific cytokines that may causally influence the risk of developing IgAN.
Main Methods:
- A two-sample bidirectional Mendelian randomization (MR) analysis was employed.
- Genetic variations for 91 cytokines and IgAN were sourced from large-scale genome-wide association studies (GWAS) of European ancestry.
- Results were validated using the GSE116626 dataset from the GEO database.
Main Results:
- Transforming growth factor-alpha (TGF-alpha), leukemia inhibitory factor (LIF), and C-C motif chemokine 19 (CCL19) were identified as significantly associated with an increased risk of IgAN.
- No evidence of a causal effect of IgAN on the 91 circulating cytokines was found.
- CCL19 showed significant upregulation in renal tissues of IgAN patients, confirmed via the GEO database.
Conclusions:
- This study establishes a causal link between specific inflammatory cytokines and IgA nephropathy.
- TGF-alpha, LIF, and CCL19 are implicated as potential upstream mediators in IgAN pathogenesis.
- The role of CCL19 in IgAN pathogenesis is supported by validation data, though its predictive or therapeutic potential requires further research.
