Interleukin-1 gene complex polymorphisms in systemic sclerosis patients with severe restrictive lung physiology
Lorenzo Beretta1, Francesca Bertolotti, Francesca Cappiello
1Unit of Clinical Immunology and Allergology, IRCCS Fondazione Policlinico-Mangiagalli-Regina Elena and University of Milan, Milan, Italy.
Human Immunology
|June 23, 2007
Summary
Genetic variations in the Interleukin-1 beta (IL-1beta) gene complex, specifically the C+3962T single nucleotide polymorphism (SNP), are linked to severe lung restriction in patients with systemic sclerosis (SSc). This finding may aid in predicting disease progression.
Area of Science:
- Immunogenetics
- Pulmonary Medicine
- Rheumatology
Background:
- Elevated interleukin-1 (IL-1) levels correlate with reduced lung function (forced vital capacity, FVC) in systemic sclerosis (SSc).
- IL-1 production is genetically regulated, suggesting a role for genetic variations in SSc-related lung disease.
Purpose of the Study:
- To investigate the association between single nucleotide polymorphisms (SNPs) in the IL-1 gene complex and other related cytokines with the development of severe ventilatory restriction in Italian SSc patients.
- To identify genetic markers that predict the progression of restrictive lung physiology in SSc.
Main Methods:
- Genotyping of 204 Italian SSc patients for specific SNPs within the IL-1 gene complex (IL-1alpha, IL-1beta, IL-1R, IL-1Ra) and regulatory cytokines (IFNgamma, TNFalpha, IL-10).
- Utilizing a Cox regression model to assess the risk of developing severe ventilatory restriction (FVC<55% predicted), incorporating clinical covariates like disease subset, autoantibodies, and immunosuppressant use.
- Correcting p-values for multiple comparisons to ensure statistical rigor.
Main Results:
- The IL-1beta C+3962T SNP (TT genotype) was significantly associated with an increased risk of severe ventilatory restriction (HR=6.61, p=0.003).
- Antitopoisomerase I antibody (HR=14.67, p=0.01) and the diffuse cutaneous SSc (dcSSc) subset (HR=3.14, p=0.007) were also identified as risk factors for severe lung restriction.
- Approximately 12.3% of patients developed severe ventilatory restriction within a mean of 6.8 years post-diagnosis.
Conclusions:
- The IL-1beta C+3962T SNP is a potential genetic marker associated with severe restrictive lung disease in Italian SSc patients.
- Clinical factors including antitopoisomerase I antibodies and the dcSSc subset contribute to the risk of developing severe ventilatory restriction.
- These findings highlight the interplay between genetic predisposition and clinical factors in SSc lung involvement.
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