The aim of the study was to investigate the association between rs5859 in Sep15, rs1139793 in TrxR2 polymorphisms with the risks of KBD and to detect the expression of AP-1 pathway in KBD subjects and in vitro. 208 KBD and 206 control subjects were included. PCR-Restriction Fragment Length Polymorphism (RFLP), Amplification Refractory Mutation Specific-PCR (ARMS-PCR) and Western Blotting were conducted. The results showed the minor A-allele frequency of rs5859 in KBD was statistically significantly higher than that in the control group (P < 0.05). The cases carrying A-allele had a 2-fold (95%CI: 1.064-3.956) increased risk of developing KBD compared with the G-allele carriers. There was no significant difference in genotype and allele distribution of rs1139793 between KBD patients and controls (P > 0.05). The frequency of the minor A allele of rs5859 was significantly different in Chinese healthy population compared with European, African and American. The frequency of the minor A allele of rs1139793 showed significant difference when compared with African and American. The levels of JunB, JunD, P65 proteins in KBD group were higher than those in control group (P < 0.0001). The expression of JunB, JunD, P65 proteins all increased in tBHP-induced C28/I2 oxidative damage model compared with control group (P < 0.05) and decreased after Se supplementation. Our finding indicated Sep15 is a possible candidate susceptibility gene for KBD. Combined with the in vitro study, our studies reveal novel insights into the mechanism of Se supplementation as an antioxidant via inhibiting the AP-1 signaling pathway in patients with KBD.
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