Abstract
Renal tubular and glomerular function was studied in patients under 18 years of age with childhood-onset systemic lupus erythematosus (SLE) in relation to disease activity in two groups: patients with clinical or laboratory evidence of lupus nephritis and those without (lupus non-nephritis). We reviewed 11 patients with lupus non-nephritis and 10 patients with lupus nephritis over a 12-month period. The measured glomerular filtration rates had a tendency to be lower in the lupus nephritis group. Glomerular dysfunction was manifest in the lupus nephritis group with elevated urinary albumin/creatinine ratios (P <0.001). Markers of tubular function were measured and compared with data from 94 controls. The lupus nephritis group had elevated urinary NAG [ N -acetyl-β- d -glucosaminidase (P =0.001)] and RBP [retinol-binding protein (P =0.03)] levels. Tubular dysfunction with elevated urinary NAG levels was present in 2 lupus non-nephritis patients with no evidence of glomerular disease. The cohort of patients in this study was followed and 2 lupus non-nephritis patients with the highest urinary RBP levels developed evidence of glomerular dysfunction and biopsy-proven lupus nephritis. Evidence of tubular dysfunction in lupus non-nephritis patients may help to identify lupus nephritis prior to the onset of albuminuria.
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V.S. was supported by John Herring and Friends Research Fund (Child Health Research Appeal Trust).
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Marks, S.D., Shah, V., Pilkington, C. et al. Renal tubular dysfunction in children with systemic lupus erythematosus. Pediatr Nephrol 20, 141–148 (2005). https://doi.org/10.1007/s00467-004-1707-6
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DOI: https://doi.org/10.1007/s00467-004-1707-6