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The studies using an immunohistological technique revealed that overexpression of oxidative stress-related substance such as HNE was observed in the liver of primary biliary cirrhosis patients. These data suggested that oxidative stress participated in the pathogenesis of primary biliary cirrhosis. Therefore we analyzed serum oxdative stress marker (8-OHdG) and anti oxidative substances (Mn-SOD and TRX) to evaluate their clinical significance. In addition we analyzed the genotype of anti oxidative substance GST that has been reported to relate susceptibility of autoimmune disease. Serum levels of 8-OHdG, Mn-SOD and TRX in PBC patients were significantly higher than those of healthy subjects (P&lt;0.001). Though there was no relation between serum level of 8-OHdG and clinical data, positive correlation between serum level of Mn-SOD, TRX and serum level of ALP, IgM was observed. Positive correlation was also observed between serum level of Mn-SOD and TRX. Serum levels of Mn-SOD of patients who responded to UDCA therapy were significantly higher than those of patients who did not response to therapy (P&lt;0.01). Although genotypic difference of GSTM1 and GSTT1 by peripheral blood mononuclear cells did not relate to susceptibility of PBC, serum titer of AMA of GSTM1 null and GSTT1 null patients were significantly higher than those of GSTM1 positive and/or GSTT1 positive patients (P&lt; 0.05). These findings suggest that serum oxidative stress-related markers may reflect the extent of liver damage of PBC, and may relate to the efficacy of UDCA therapy on PBC. It also made clear that genotype of GST related to the titer of AMA.

Significance of serum oxidative stress related markers and genotype of GST gene in the pathogeneses of primary biliary cirrhosis