Cytokine Polymorphisms, Their Influence and Levels in Brazilian Patients with Pulmonary Tuberculosis during Antituberculosis Treatment
Cytokines play an essential role during active tuberculosis disease and cytokine genes have been described in association with altered cytokine levels. Therefore, the aim of this study was to verify ifIFNG, IL12B, TNF, IL17A, IL10, and TGFB1gene polymorphisms influence the immune response of Brazilian patients with pulmonary tuberculosis (PTB) at different time points of antituberculosis treatment (T1, T2, and T3). Our results showed the following associations:IFNG+874 T allele andIFNG+2109 A allele with higher IFN-γlevels;IL12B+1188 C allele with higher IL-12 levels;TNF−308 A allele with higher TNF-αplasma levels in controls and mRNA levels in PTB patients at T1;IL17AA allele at rs7747909 with higher IL-17 levels;IL10−819 T allele with higher IL-10 levels; andTGFB1+29 CC genotype higher TGF-βplasma levels in PTB patients at T2. The present study suggests thatIFNG+874T/A,IFNG+2109A/G,IL12B+1188A/C,IL10−819C/T, andTGFB1+21C/T are associated with differential cytokine levels in pulmonary tuberculosis patients and may play a role in the initiation and maintenance of acquired cellular immunity to tuberculosis and in the outcome of the active disease while on antituberculosis treatment.