Abstract:
INTRODUCTION AND AIMS:N-Acetyl-β-D-glucosaminidase (NAG), a marker of renal tubular dysfunction, is increased in patients with lupus nephritis. In addition to the toxic effects of proteinuria, patients with lupus nephritis may exhibit other factors that contribute to tubular dysfunction, such as pathogenic antitubular basement membrane antibodies. The aim of our study was to assess urinary NAG, proteinuria, and glomerular filtration rate (GFR) before treatment and after 7 and 30 days of oral prednisone therapy in patients with lupus nephritis. METHODS:Ten patients with lupus nephritis, all females, mean age: 29.4 ± 10.17 years, were enrolled into the study. All the patients received oral prednisone 1 mg/kg. Twenty healthy subjects served as controls. We measured urinary NAG before treatment and after 7 and 30 days of oral prednisone therapy. Proteinuria, GFR, blood pressure, and side effects of therapy were also followed up. Urinary NAG was measured using the colorimetrical method and expressed as units per gram of creatinine (U/gCr). Statistical analysis (Wilcoxon signed ranks test and Wilcoxon rank sum test) was performed using SPSS 17. RESULTS:In the 10 patients with lupus nephritis, urinary NAG before treatment was 16.9 ± 13.39 U/gCr (P = 0.005 compared with controls). NAG in controls was 1.73 ± 0.51 U/gCr. Proteinuria before treatment was 3.84 ± 1.93 g/24 h. The GFR before treatment was 50.48 ± 11.98 mL/min/1.73 m². After 7 days of prednisone, urinary NAG was 23.55 ± 25.25 U/gCr (P = 0.878 compared with baseline, and P = 0.02 compared with controls). Proteinuria was 2.94 ± 1.3 g/24 h (P = 0.005 compared with baseline), and the GFR was 58.11 ± 13.64 mL/min/1.73 m² (P = 0.005 compared with baseline). After 30 days of prednisone, urinary NAG was 11.77 ± 12.18 U/gCr (P = 0.203 compared with baseline, P = 0.022 compared with the value after 7 days of prednisone, and P = 0.01 compared with controls). Proteinuria was 1.73 ± 0.68 g/24 h (P = 0.005 compared with baseline, and P = 0.005 compared with the value after 7 days of prednisone), and the GFR was 67.49 ± 16.42 mL/min/1.73 m² (P = 0.005 compared with baseline and P = 0.009 compared with the value after 7 days of prednisone). Blood pressure measurements did not show any significant changes. No major side effects of steroid therapy were noticed. CONCLUSIONS:Urinary NAG showed a significant reduction between 7 and 30 days of therapy. The reduction in urinary NAG set in later than the decline in proteinuria and the improvement in GFR. Further studies incorporating a longer follow-up are needed to observe whether the reduction in NAG persists upon continuation of prednisone therapy.
journal_name
Immunopharmacol Immunotoxicoljournal_title
Immunopharmacology and immunotoxicologyauthors
Gluhovschi C,Velciov S,Kaycsa A,Gluhovschi G,Petrica L,Marian R,Bozdog G,Gadalean F,Bob F,Cioca D,Vernic Cdoi
10.3109/08923973.2011.585343subject
Has Abstractpub_date
2012-02-01 00:00:00pages
163-9issue
1eissn
0892-3973issn
1532-2513journal_volume
34pub_type
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