Nephrology Dialysis Transplantation, Vol 12, Issue 12 2576-2579, Copyright © 1997 by Oxford University Press
M Praga, E Artal, E Hernandez, , M Moreno, J Morales and J Rodicio
Background: Angiotensin-converting enzyme (ACE)
inhibitors have an antiproteinuric effect in membranous glomerulonephritis
(MGN). However, no studies hae investigated whether this antiproteinuric
effect is influenced by urinary C5b-9 excretion, a marker of immunological
activity in this disease. Methods: Eleven patients
with biopsy-proven MGN were treated with captopril for 8 weeks. The
evolution of several clinical and biochemical parameters, including 24-h
urinary protein excretion was evaluated every 4 weeks. Urinary C5b-9
excretion was measured at the onset and at the end of captopril treatment.
Results: Patients with MGN had significantly higher
C5b-9 excretions than a group of 14 healthy controls (89±23 vs
3.7±1.4 ng/mg UCr; P<0.001). A significant correlation
was found between urinary C5b-9 and the magnitude of proteinuria, both at
the onset and at the end of treatment. After 8 weeks of captopril
treatment, proteinuria had decreased from 8±1.8 to
5.2±1.3 g/day (P<0.05). Four weeks after captopril
discontinuation, proteinuria rose to 7.3±1.7 g/day
(P<0.05). A marked variability in the antiproteinuric response was
observed, ranging from 0 to 85% with respect to baseline values. No
correlation between decrease in proteinuria and baseline urinary C5b-9
levels was observed. Several patients with elevated urinary C5b-9 levels
had captopril-induced decrease in proteinuria.
Conclusions: ACE inhibition induces an antiproteinuric
effect in patients with MGN. The urinary C5b-9 excretion does not predict
the magnitude of this response. Key words: ACE
inhibitors; C5b-9 urinary excretion; complement terminal complexes;
membranous glomerulonephritis; proteinuria decrease
ORIGINAL ARTICLES
Antiproteinuric effect of angiotensin-converting enzyme inhibition and C5b-9 urinary excretion in membranous glomerulonephritis
Servicio de Nefrologia, Hospital 12 de Octubre, Crta de Analucia Km 5.400m, 28041 Madrid, Spain; Corresponding author
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