Objective To investigate whether three biallelic polymorphisms at positions -592, -819 and -1082 in the promoter region of the IL-10 gene are associated with increased incidence of severe sepsis.Methods The IL-10 -592, -819 and -1082 polymorphisms were typed using polymerase chain reaction followed by digestion with the restriction enzymes Rsa I , Mae III and Mnl | , respectively.Results Patients with severe sepsis were more likely to have IL-10 -1082 allele 1, compared with controls (P<0. 05). Genotype distribution of the IL-10 -1082 polymorphism significantly differed between patients and controls (P<0. 05). However, the allele frequencies and genotype distribution of the IL-10 -1082 polymorphism did not differ between surviving and dead patients (P>0. 05). No significant differences in the genotype distribution and allele frequencies of the IL-10 -592 and IL-10 -819 polymorphisms were observed between patients with severe sepsis and heathy controls, nor between surviving and dead patients (P> 0. 05).Conclusions The polymorphism at position -1082 in the promoter region of the IL-10 gene may be associated with susceptibility to severe sepsis. In constrast, the other two highly linked IL-10 polymorphisms are not associated with incidence or the outcome of severe sepsis.
Background The highly polymorphic intedeukin 10.G （IL10.G） microsatellite located in the promoter region of the interleukin-10 （IL-10） gene exerts a positive transcriptional regulatory effect on IL-10 gene expression and correlates with the in vitro IL-10 secretion. This study was conducted to investigate whether IL10.G microsatellite is associated with the incidence and/or the outcome of severe sepsis. Methods One hundred and fifteen patients with severe sepsis who had been treated at the intensive care unit of the university hospital were studied. One hundred and forty-one healthy individuals served as controls. IL10.G microsatellite genotyping was performed with the following two methods： fluorescent based polymerase chain reaction （PCR） techniques and silver staining of the amplified DNA fragment in polyacrylamide gel. Alleles were defined according to the size of the amplified DNA product. Results Ten alleles and 36 genotypes were detected both in the patients with severe sepsis and in the healthy controls. Allele IL10.G9 and allele IL10.G13 were the commonest alleles with the frequencies of 32.6% and 21.3% respectively in the patients with severe sepsis, and 34% and 27% respectively in the healthy controls. The allele frequencies of IL10.G microsatellite were neither different between the patients with severe sepsis and the healthy controls （P 〉 0.05）, nor between survivors and non-survivors （P 〉 0.05）. However, the frequency of one common allele IL10.G13 was slightly lower in the patients with severe sepsis than in the healthy controls （21.3% vs 27%, P 〉 0.05）, and the frequency of allele IL10.G9 was slightly higher in the non-survivors than in the survivors （37.1% vs 28.1%, P 〉 0.05）.Conclusion IL10.G microsatellite may neither contribute to the susceptibility to severe sepsis nor to the fatal outcome of severe sepsis.
SHU QiangSHI Chang-chunZHANG Xiang-hongSHI ZhuoSHI Shan-shanFANG Xiang-mingCHEN Qi-xingStuber Frank
