Urinary excretion of alanine aminopeptidase (EC 3.4.11.2) and N-acetyl-beta-D-glucosaminidase (EC 3.2.1.30) was determined for 25-70 days in five patients receiving cis-platinum and for 8-53 days in six patients receiving amikacin. This study was performed to investigate if the excretion of urinary enzymes represents a sensitive parameter for the early detection of toxic kidney damage. The determination of N-acetyl-beta-D-glucosaminidase was carried out by the method of Knoll et al. [13]. The procedure of Mondorf et al. [14] for the estimation of alanine aminopeptidase activity was adapted to the Gemsaec Fast-Analyzer. In both patient groups an increase in the excretion of the two enzyme activities could be demonstrated. In patients receiving amikacin, the excretion of alanine aminopeptidase was always higher than that of N-acetyl-beta-D-glucosaminidase, whereas in three patients receiving cis-platinum it was the opposite. In two cis-platinum patients the excretion of both enzymes was of the same size. The changes during amikacin therapy seem to be reversible, whereas in four cis-platinum patients these changes seemed to be partly irreversible. Serum creatinine concentration was less sensitive than the urinary enzyme excretion for detection of kidney damage.
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