Purpose To investigate the role of mesangial cells and podocyte axis in the renal tubulointerstitial lesion in Ig A nephropathy. Method Forty cases of Ig A nephropathy diagnosed by renal biopsy were analyzed. The expression of WT-1,a specific marker of podocyte surface,TNF-α and IL-6 in renal tissue was observed by immunohistochemistry,and the activity of TNF-α and IL-6 in urine was detected by enzyme-linked immunosorbent assay( ELISA). Results The glomerular mesangial proliferation score was negatively cor...