ALEXANDRA TOTAN, ANDRA-ELENA BALCANGIU-STROESCU, MARINA MELESCANU IMRE, DANIELA MIRICESCU, DANIELA BALAN, IULIA-IOANA STANESCU, DORIN IONESCU, DELIA TIMOFTE, MARIA DANIELA TANASESCU, MARIA GREABU XOR - POSSIBLE CORRELATIONS WITH OXIDATIVE STRESS AND INFLAMMATION MARKERS IN THE CONTEXT OF DIABETIC KIDNEY DISEASE Xanthine oxidoreductase (XOR) activity plays an important role as a pivotal source of reactive oxygen species. The aim of our study was to investigate possible correlations of XOR serum levels with oxidative stress (total antioxidant capacity - TAC, anti-oxidative stress responsive 1 antibody - OXSR1) and inflammation markers (interleukin 6 - IL-6), in 20 hemodialysis diabetic patients. The present study included the hemodialysis diabetic patients group (10 males and 10 females) and the control group (20 healthy volunteers). For serum XOR (ng/mL), TAC (U/mL) and OXSR1 (ng/ml) measurements we have used the ELISA technique. Serum IL6 (pg/mL) was performed using an automatic immunoassay system (Immulite 1000, Siemens- Germany). Comparing the two groups, our results revealed significantly increased serum levels for XOR (6.2±1.5 / 3.9±1.1); OXSR1 (11.3±2.9 / 6.2±2.1) and IL6 (7.0±1.2 / 5.0±0.4). Patients’ serum levels of TAC were significantly decreased compared with the control group values (25.2±3.9 / 33.5±2.8). It becomes more and more obvious that oxidative stress is an important element initiating diabetic microvascular complications, including diabetic kidney disease. Our results suggested that XOR should be regarded as an important target in the attempt to reduce oxidative stress in the context of diabetic kidney disease.