T. Ishii et al., Neither IL-1 beta, IL-1 receptor antagonist, nor TNF-alpha polymorphisms are associated with susceptibility to COPD, RESP MED, 94(9), 2000, pp. 847-851
The cytokines that contribute to airway inflammation, including interleukin
-1 beta (IL-1 beta)and tumour necrosis factor alpha (TNF alpha), might have
key roles in the development of chronic obstructive pulmonary disease (COP
D). Interleukin-1 receptor antagonist (IL-1RN), the physiological antagonis
t of IL-1 beta, is also known to play a crucial role in several chronic inf
lammatory diseases. In this study, we investigated the association of the p
olymorphisms of IL-1 beta, IL-1RN and TNF alpha with susceptibility to COPD
.
To elucidate the genotype of the IL-1 beta polymorphisms at position -511 b
ase and at the amino acid residue 105, the IL-1RN polymorphism in intron 2,
and TNF alpha polymorphism at position -308. polymerase chain reaction (PC
R) and restriction enzyme fragment length polymorphism (RFLP) were performe
d on blood samples from both patients with COPD (n = 53) and control subjec
ts (n = 65).
There were no differences on the allele and genotype frequency of IL-1 beta
, IL-1RN, and TNF alpha between the two groups.
We could not find a significant link between the polymorphism of TNF alpha,
which was previously reported to be associated with chronic bronchitis, an
d COPD. Furthermore, no association between genetic polymorphisms of IL1-be
ta and IL-1RN and individual susceptibility to COPD was found.