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  • Title: Association of interleukin-17 gene polymorphisms and susceptibility to brucellosis in Hamadan, western Iran.
    Author: Keramat F, Kazemi S, Saidijam M, Zamani A, Kohan HF, Mamani M, Eini P, Moghimbigi A, Alikhani MY.
    Journal: Microbiol Immunol; 2019 Mar; 63(3-4):139-146. PubMed ID: 30851127.
    Abstract:
    IL-17is one of the most important inflammatory cytokines that stimulate immunity responses in humans infected with Brucella species, acting as a regulator that reduces release of γ-IFN, thus increasing resistance to brucellosis. Gene polymorphisms in the regulatory regions of cytokine-encoding genes affect the amountsof cytokines produced and play a fundamental role in infectious diseases. The aim of this study was to determine the association between IL-17 gene polymorphisms and susceptibility to brucellosis. In this case-control study, 86 patients with brucellosis and 86 healthy persons in Hamadan, western Iran, from September 2014 to September 2016, were included. IL-17 genetic variants at positions rs4711998 A/G, rs8193036 C/T, rs3819024 A/G, rs2275913 A/G, rs3819025 A/G, rs8193038 A/G, rs3804513 A/T, rs1974226 A/G and rs3748067 A/G were analyzed by restriction fragment length polymorphism-PCR. Serum IL-17 titers were measured by sandwich ELISA. GG genotypes at positions rs4711998 and rs3748067 were present significantly more frequently in patients with brucellosis than in controls (P < 0.05). The AA genotype at positions rs4711998, rs2275913 and rs3748067 and GG genotype at position rs19744226 were present significantly more frequently in controls than in the patient group. These results suggest that the AA genotype at positions rs3748067, rs3819025 and rs4711998 and GG genotype at position rs3819024 are likely protective factors against brucellosis, whereas the GG genotype at positions rs3748067, rs3819025 and rs4711998 and AA genotype at position rs3819024 may be risk factors against the disease. No significant relationships were found between serum IL-17 titers and genotypes of the single-nucleotide polymorphisms.
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