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Iran J Immunol. 2013 Sep;10(3):158-66. doi: IJIv10i3A4.

Interleukin-8 but not interleukin-6 variant may affect susceptibility to brucellosis.

Author information

  • 1Department of Immunology, Professor Alborzi Clinical Microbiology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran, e-mail: sadafasaei@yahoo.com.



Increased levels of interleukin-8 (IL-8) and interleukin-6 (IL-6) in acute human brucellosis have been reported. Previous studies have shown that the production and level of IL-6 and IL-8 cytokines are associated with the polymorphism of the encoding genes.


To investigate the probable association between IL-6 (-174 C/G) and IL-8 (-251 A/T) gene polymorphisms and susceptibility/resistance to brucellosis.


The patient group included 196 patients suffering from Brucella infection and the control group consisted of 82 healthy animal husbandmen from the same geographical area. IL-8 (-251 A/C) and IL-6 (-174 C/G) gene polymorphisms were analyzed by PCR-RFLP and Allele Specific PCR (AS-PCR) respectively.


The frequency of -251 IL-8 AA genotype was significantly lower in the controls compared with that of the patients (p=0.0051), while the frequencies of other genotypes (AT and TT) and alleles (A and T) were not significantly different among the participants. No association was found between IL-6 (-174 C/G) polymorphism and brucellosis.


This study indicates that the IL-8 -251 AA genotype may be considered as a genetic susceptibility factor for brucellosis.

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