Abstract:
INTRODUCTION:Complement activation is central to the pathogenesis of lupus nephritis (LN). Low serum complement C3 and C4, are traditionally used as markers of lupus disease activity in general and LN in particular. In this study we prospectively measured plasma and urine C3d and C4d, degradation products of C3 and C4 corrected to creatinine in a cohort of biopsy proven LN in a longitudinal fashion for its correlation with disease activity. METHODS:Twenty eight biopsy proven active lupus nephritis (AN) were recruited along with four inactive nephritis (IN) and 10 healthy controls (HC). Plasma and urine were collected at baseline, prior to induction treatment and 3 months later. Clinical measures of disease activity, Systemic lupus erythematosus disease activity index 2000 (SLEDAI 2K), renal SLEDAI, serum C3, C4 and antibodies to ds DNA, urine protein and creatinine excretion (UP/UC) were collected. Plasma and urine C3d and C4d were measured using ELISA and normalized to spot urine creatinine value. RESULTS:Twenty eight AN of median age of 26.5 (20-31.50) years and disease duration of 3 (0.7-5) years were enrolled. The median urinary C3d/creatinine before treatment was 388.20 (48.98-1296) ng/mg which fell significantly to 62.69 (28.04-502.4) ng/mg at 3 months followup (p-0.01). The baseline values for the active renal disease was significantly different from IN group (9.9 (4.5-46.53 ng/mg) p-0.00). Treatment responders (partial and complete) at 6 months showed a significant fall in urinary C3d at 3 months whereas non responders had a non significant change in value. There was a significant correlation of urine C3d/creatinine with SLEDAI2K (r-0.433, p-0.00), renal SLEDAI (r-0.356, p-0.00), UP/UC ratio (r-0.489, p-<0.0001) but no significant correlation with C3 or C4. There was a significant fall in the median values of plasma C3d from 791.1 (516.0.00-1550.43) µg/ml to 338.52 (211.35-525.82) (p-0.00) µg/ml at the end of 3 months. The values showed a significant correlation with SLEDAI 2K, renal SLEDAI, UP/UC along with a significant negative correlation with C3 and C4. CONCLUSION:Urinary C3d/creatinine levels and plasma C3d levels can be used as biomarker of disease activity and treatment response.
journal_name
Lupusjournal_title
Lupusauthors
Ganguly S,Majumder S,Kumar S,Gupta R,Muhammed H,Shobha V,Aggarwal A,Misra Rdoi
10.1177/0961203320950019subject
Has Abstractpub_date
2020-11-01 00:00:00pages
1800-1806issue
13eissn
0961-2033issn
1477-0962journal_volume
29pub_type
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