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Title: In vitro liver models are important tools to monitor the abuse of anabolic steroids in cattle
Authors: VAN PUYMBROECK, Mark 
Kuilman, MEM
Maas, RFM
Witkamp, RF
RAUS, Jef 
Issue Date: 1998
Source: ANALYST, 123(12). p. 2453-2456
Abstract: Current veterinary residue analysis mainly focuses on the monitoring of residues of the administered parent compound. However, it is possible that larger amounts of metabolites are excreted and that they can have a prolonged excretion period. In order to unravel specific metabolic steps and to identify possible biological markers, two in vitro liver models were used, i.e. monolayer cultures of isolated hepatocytes and liver microsomes, both prepared from liver tissue of cattle. Clostebol, boldenone, norethandrolone (NE) and ethylestrenol (EES) were used as model substrates. Results show that the metabolic profiles derived from in vitro experiments are predictive for the in vivo metabolic pathways of the steroids evaluated in this study. By means of this strategy, it is possible to identify 17 alpha-ethyl-5 beta-estrane-3 alpha,17 beta-diol (EED) as a common biological marker for NE and EES. By in vivo experiments it was shown that EED is particularly important for the detection of the abuse of NE or EES because of its high excretion levels and its prolonged presence as compared with the parent compounds or any other metabolite.
Notes: Dr L Willems Inst, Dept Drug & Residue Anal, B-3590 Diepenbeek, Belgium. Limburgs Univ Ctr, Dept SBM, B-3590 Diepenbeek, Belgium. Univ Utrecht, Dept Vet Pharmacol Pharm & Toxicol, NL-3508 TD Utrecht, Netherlands. TNO Pharma, NL-3700 AJ Zeist, Netherlands.Van Puymbroeck, M, Dr L Willems Inst, Dept Drug & Residue Anal, B-3590 Diepenbeek, Belgium.
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ISI #: 000077607100011
Type: Journal Contribution
Validations: ecoom 2000
Appears in Collections:Research publications

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