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An hypothesis for a mechanism underlying hepatotoxin-induced hypercreatinuria.
T Andrew Clayton1, John C Lindon, Jeremy R Everett
1Biological Chemistry, Biomedical Sciences Division, Imperial College of Science, Technology & Medicine, Sir Alexander Fleming Building, South Kensington, SW7 2AZ, London, UK. a.clayton@ic.ac.uk
Archives of Toxicology
|April 17, 2003
Summary
Hepatotoxicity detection using NMR revealed distinct urinary taurine and creatine changes. These biomarkers help differentiate toxin effects on the liver, aiding early detection.
Area of Science:
- Metabonomics
- Toxicology
- Biochemistry
Background:
- Early detection of liver toxicity is crucial.
- Metabonomic investigations can identify biomarkers for site-specific hepatotoxicity.
- Urinary metabolite changes can reflect hepatic responses to toxins.
Purpose of the Study:
- To investigate early detection and discrimination of site-specific hepatotoxicity.
- To quantify toxin-induced changes in urinary taurine and creatine excretion.
- To explore the relationship between hepatic cysteine metabolism and urinary biomarker changes.
Main Methods:
- Male Sprague-Dawley rats were dosed with model hepatotoxins: allyl formate, ethionine, and alpha-naphthylisothiocyanate (ANIT).
- Urine samples were analyzed using (1)H nuclear magnetic resonance (NMR) spectroscopy.
- Urinary taurine and creatine excretion levels were quantified pre- and post-dose.
Main Results:
- Allyl formate induced hypertaurinuria and hypercreatinuria.
- Ethionine caused hypertaurinuria but no change in creatine excretion.
- ANIT resulted in hypotaurinuria and hypercreatinuria.
- Observed changes indicate differential effects of toxins on the liver.
Conclusions:
- Distinct patterns of urinary taurine and creatine excretion can discriminate between different hepatotoxins.
- These changes suggest varying impacts on liver function.
- A hypothesis is proposed linking selective hypercreatinuria to increased cysteine synthesis, potentially involving altered hepatic cysteine utilization.