RESUMEN
Minimal change nephrotic syndrome [MCNS] accounts for about 75% of causes of NS in children. A still growing body of evidence has accumulated indicating that a disturbance of balance between oxidative stress and antioxidant defence mechanisms plays a major role in the pathomechanism of glomerular diseases. This study was carried out to evaluate the role of oxidant-antioxidant imbalance in the pathogenesis of MCNS. The serum levels of some antioxidants [alpha -tocopherol, superoxide dismutase "SOD", selenium, zinc and copper] were estimated in 50 children, of ages ranging from 2 to 12 years, diagnosed as MCNS, and compared with that of 20 healthy age and sex- matched control children. Oxidant stress was evaluated as well in all subjected by estimating levels of serum and urinary malondialdhyde [MDA]. Levels of antioxidants, but vitamin E were significantly decreased in children suffering MCNS compared to control children. Meanwhile oxidative stress, measured by serum and urinary MDA was significantly increased in patients group. In addition, a significant positive correlation between SOD and both copper and zinc was reported. It was concluded that an oxidative stress, in. the face of defective antioxidant defence, does exist and may play a role in the pathogenesis of idiopathic nephrotic syndrome. So it is recommended that nutritional antioxidants, especially vitamin E, selenium, zinc, and copper should be added in the diet of children and all risky groups