A study was conducted to evaluate role of complement proteins and complementreceptor 1 (CR1) in pathogenesis of Systemic lupus erythematosus (SLE) and Immunecomplex (IC) mediated glomerulonephritis. C3, C4, C3d and CH100 in serum, CR1 inrenal biopsies and RBC showed these parameters to be of great diagnostic andprognostic values in Immune complex mediated diseases. Our study revealed an overalldecrease in levels of CR1, C3, C4 in IC mediated as compared to non - IC mediateddisease. Whereas C3d in case of SLE 247 ± 39 AU/L including IC mediatedGlomerulonephritis (ICGN) 208 ± 51 AU/L was found to be significantly increased(P < 0.05) than normal control 46 ± 6 AU/L. There was no appreciable increase incase of non - 1C mediated GN (61 ± 12 AU/L) CRI among SLE patients (261 ± 141/E)and IC mediated group (270 ± 107/E) was found to be significantly lower (P < 0.05)than normal control (627 ± 132/E) and non - IC GN (550 ± 86/E). C4 values amongSLE, patients were found to be 191 ± 104 mg/L as compared to control (286 ±110 mg/L). The kidney biopsy of type III and type IV lupus nephritis revealed a completeabsence of CR1 in contrast to minimal change diseases. Thus this study revealed thatabove parameters could be a valuable tool for distinguishing IC versus non-IC mediatedkidney diseases.Key Words: Complement receptor 1 (CR1) Glomerulonephritis, SLE.
Mesangial cell complement receptor 1-related protein y limits complement-dependent neutrophil accumulation in immune complex glomerulonephritis
