Nephrology Dialysis Transplantation, Vol 13, Issue 7 1686-1689, Copyright © 1998 by Oxford University Press
J Dotsch, J Hanze, V Knufer, J Steiss, K Dittrich, A Seidel and W Rascher
Background: Adrenomedullin (AM), a smooth-muscle
relaxant peptide, is stimulated by cytokines and bacterial endotoxins. We
hypothesized that urinary-tract infections may be associated with elevated
urinary AM excretion. Methods: AM in urine was
quantified in eleven children with urinary-tract infection and 11 age- and
sex-matched controls by radioimmunoassay. RT-PCR was used to demonstrate
local AM mRNA expression in the urinary tract.
Results: In healthy controls but not in diseased
children there was a significant correlation between AM and creatinine in
urine (r-0.91, P<0.001). AM levels in children with urinary tract
infection were significantly higher than in controls (0.6±0.41
vs 0.15±0.14 ng/&mgr;mol creatinine;
P<0.001; (means±SD)). There was a significant correlation
between white cell count and AM in urine (r-0.78, P<0.001). AM mRNA
was expressed in renal tissue, renal pelvis, ureter, bladder, and urethra.
Conclusion: The smooth-muscle relaxant peptide
adrenomedullin that is synthesized in tissue of the human urinary tract is
elevated in urine of patients with urinary-tract infections. A possible
consequence might be the interference with the ureteral anti-reflux
mechanisms. Key words: adrenomedullin, inflammation,
urinary tract infection
ORIGINAL ARTICLES
Increased urinary adrenomedullin excretion in children with urinary-tract infection
Departments of Pediatrics and Pathology, Justus-Liebig-Universitat, Giessen, Germany; Corresponding author at: Department of Pediatrics, Loschgestrasse 15, D-91054 Erlanden, Germany
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