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Is interleukin-6 important in inflammatory bowel disease?
K Koss1, J Satsangi, K I Welsh
1Gastroenterology Unit, Radcliffe Infirmary, Oxford, UK. konradkoss@yahoo.com
Genes and Immunity
|February 24, 2001
Summary
Interleukin-6 (IL-6) gene variations show increased frequency in inflammatory bowel disease patients. These IL-6 polymorphisms may serve as genetic markers for disease susceptibility, though not directly impacting IL-6 production.
Area of Science:
- Genetics
- Immunology
- Gastroenterology
Background:
- The Interleukin-6 (IL-6) gene is located on chromosome 7, a region associated with inflammatory bowel disease (IBD) susceptibility.
- Investigating genetic variations in IL-6 is crucial for understanding IBD pathogenesis.
Purpose of the Study:
- To analyze the functional effects of Interleukin-6 (IL-6) gene polymorphisms in the 4th intron and 3' flanking region.
- To determine the association of these polymorphisms with inflammatory bowel disease (IBD), including Crohn's disease (CD) and ulcerative colitis (UC).
Main Methods:
- Utilized polymerase chain reaction with sequence-specific primers (PCR-SSP) to identify a G to A polymorphism in intron 4 of the IL-6 gene.
- Employed variable number of tandem repeats PCR (VNTR-PCR) to study four alleles in the 3' flanking region.
- Measured IL-6 production in lipopolysaccharide-stimulated whole blood samples using enzyme-linked immunosorbent assay (ELISA).
Main Results:
- A modest increase in the IL-6*G allele frequency was observed in Crohn's disease (50%) and ulcerative colitis (46.1%) patients compared to controls (39.8%, P = 0.025).
- No significant functional impact of the studied IL-6 polymorphisms on IL-6 protein production was detected.
Conclusions:
- The investigated IL-6 polymorphisms may be in linkage disequilibrium with a susceptibility gene for inflammatory bowel disease.
- These IL-6 polymorphisms could potentially serve as valuable genetic markers for IBD susceptibility.