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Disposition of isosteviol in the rat isolated perfused liver
Author(s) -
Jin Hongping,
Wang Jiping,
Gerber Jacobus P,
Davey Andrew K
Publication year - 2010
Publication title -
clinical and experimental pharmacology and physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 103
eISSN - 1440-1681
pISSN - 0305-1870
DOI - 10.1111/j.1440-1681.2010.05359.x
Subject(s) - glucuronide , perfusion , incubation , chemistry , metabolism , medicine , endocrinology , chromatography , biochemistry
Summary 1. The aim of the present study was to investigate the mechanisms involved in the clearance of isosteviol using the rat isolated perfused liver. 2. Six livers from male Sprague‐Dawley rats were perfused with 15.7 μmol isosteviol in a recirculating system. Perfusate and bile samples were collected for 60 min and the liver was collected at the end of the perfusion. All samples collected were incubated with α‐glucuronidase. Isosteviol–glucuronide was determined as equivalent isosteviol. Isosteviol concentrations were determined using a previously developed liquid chromatography–tandem mass spectrometry method. The final isosteviol liver/perfusate (L/P), bile/liver (B/L) and isosteviol‐glucuronide in bile/liver (B G /L G ) ratios were determined. 3. Isosteviol has a high clearance (21.4 ± 4.8 mL/min) from the perfusate, with a short half‐life (13 ± 4 min). α‐Glucuronidase incubation revealed that isosteviol is conjugated in the liver and excreted into the bile. There was no isosteviol‐glucuronide detected in perfusate samples. The total recovery of the rat isolated perfused liver system is 74 ± 14% and glucuronidated isosteviol accounted for 23 ± 4% of the administered dose. 4. In conclusion, we are the first to characterize the metabolism of isosteviol using rat isolated liver perfusion. Our results strongly suggest that the liver is the main organ of isosteviol elimination and that isosteviol is glucuronidated in the liver before it is excreted into the bile.