In this study, we aimed to investigate the relationship between renal P-glycoprotein (rP-gp) expression and response to corticosteroid therapy in childhood nephrotic syndrome (NS). Expression of rP-gp was evaluated prior to non-steroid immunosuppressive therapy in children with NS (Group 1), prior to any treatment in children with immunoglobulin (Ig)A nephropathy (Group 2), and during renal donation in healthy adults (Group 3); mesangial proliferation was evaluated in Groups 1 and 2. Total dosage of steroid was calculated in Group 1. The ratio of rP-gp (+) glomeruli was higher in Group 1 than Group 3 (33.8 ± 27.1% vs 4.7 ± 4.6%, p=0.000). There were no rP-gp (+) glomeruli in Group 2. The rate of mesangial proliferation was similar in Groups 1 and 2. There was no statistically significant correlation between rP-gp expression and total steroid dosage (r=0.455, p=0.160). Our findings showed that rP-gp expression is increased in patients receiving steroid therapy for NS regardless of the cumulative steroid dosage and mesangial cell proliferation.

How to cite

Türkmen M, Torun Bayram M, Soylu A, Özer E, Sarıoğlu S, Kavukçu S. The relationship between renal P-glycoprotein expression and response to steroid therapy in childhood nephrotic syndrome. Turk J Pediatr 2013; 55: 260-265.