Fig. 2

Renal pathology and C4d deposition in kidney tissues from patients with pSS related renal impairments. pSS renal impairments (light microscopy, IHC). Tubulointerstitial C4d and peritubular capillary C4d staining were semi-quantitatively scored from 1 to 3. A1 × 200, pSS-related MN, C4d continuous staining along GBM and mild staining in mesangium(arrow). A2 × 200, pSS-related MN, C4d segmental staining along GBM. A3 × 100, pSS-related IgAN, mild mesangial staining of C4d which did not meet the criteria for G-C4d+, mesangial deposition of IgA and C3 positive. B1 × 200, TI-C4d score 1. Clinically dRTA, TIN, IF(−). B2 × 200, TI-C4d score 2. Clinically dRTA, TIN, IF(−). B3 × 200, TI-C4d score 3. Clinically RTA, TIN+mild MePGN, glomerular IF(−), interstitial C3 deposition positive by IF. C1 × 200, PTC C4d score 1(minimal staining). TIN+MePGN, IF(−). C2 × 200, PTC C4d score 2(focal staining). Early MN, with IgG(3+), IgA(2+) and C3(3+) deposition along GBM, C1q negative. C3 × 200, PTC-C4d score 3(diffuse staining). TIN