Abstract
The acute biochemical effects of the nephrotoxin p-aminophenol (PAP) were studied in detail using a combination of conventional bioanalytical and 1H-NMR spectroscopic methods. Dosing PAP (25–100 mg/kg) to male F344 rats resulted in a dose-related proximal nephropathy with consequent elevations in urinary enzymes, glucose, and urine total protein as shown by conventional methodology. 1H-NMR spectroscopy at 400 MHz of urine from PAP-treated rats also revealed a characteristic glycosuria, with concomitant amino aciduria. The increased excretion of these compounds indicates functional defects in the proximal tubule and reduced solute reabsorption efficiency. In addition, 1H-NMR urinalysis and conventional enzymatic analysis showed a dose-related lactic aciduria. Other changes detected by 1H-NMR included a dose-related reduction in the excretion of citrate (confirmed by a conventional biochemical method) and an increase in the excretion of acetate. The degree of abnormalities shown by 1H-NMR urinalysis agreed well with histopathological observations and conventional biochemical indices of nephrotoxicity. 1H-NMR urinalysis therefore serves to highlight changes in the excretion of low MW urine components not routinely studied by conventional biochemical analysis.
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Abbreviations
- ALP:
-
alkaline phosphatase
- APAP:
-
paracetamol
- BUN:
-
blood urea nitrogen
- GFR:
-
glomerular filtration rate
- GOT:
-
glutamate oxaloacetate transaminase
- LAP:
-
leucine aminopeptidase
- LDH:
-
lactate dehydrogenase
- MW:
-
molecular weight
- NAG:
-
N-acetyl-β-D-glucosaminidase
- PAP:
-
p-aminophenol
- ppm:
-
parts per million
- TMAO:
-
trimethylamine N-oxide
- UFR:
-
urine flow rate
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Gartland, K.P.R., Bonner, F.W., Timbrell, J.A. et al. Biochemical characterisation of para-aminophenol-induced nephrotoxic lesions in the F344 rat. Arch Toxicol 63, 97–106 (1989). https://doi.org/10.1007/BF00316430
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DOI: https://doi.org/10.1007/BF00316430