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Different effects o...
Different effects of ketoconazole on the stereoselective first-pass metabolism of R/S-verapamil in the intestine and the liver : important for the mechanistic understanding of first-pass drug-drug interactions
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- Thörn, Helena Anna (författare)
- Uppsala universitet,Institutionen för farmaci,The Biopharmaceutic group
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- Hedeland, Mikael (författare)
- Uppsala universitet,Avdelningen för analytisk farmaceutisk kemi
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- Bondesson, Ulf (författare)
- Uppsala universitet,Avdelningen för analytisk farmaceutisk kemi
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- Knutson, Lars (författare)
- Uppsala universitet,Institutionen för kirurgiska vetenskaper,Loc-I-Gut laboratoriet
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Yasin, Mohammed (författare)
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Dickinson, Paul (författare)
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- Lennernäs, Hans (författare)
- Uppsala universitet,Institutionen för farmaci,The Biopharmaceutic group
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(creator_code:org_t)
- 2009-08-17
- 2009
- Engelska.
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Ingår i: Drug Metabolism And Disposition. - : American Society for Pharmacology & Experimental Therapeutics (ASPET). - 0090-9556 .- 1521-009X. ; 37:11, s. 2186-2196
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- In this acute study a pig jejunal intestinal perfusion model with multiple plasma sampling sites and three different administration routes was used to investigate the quantitative contribution of the intestine versus liver to the first-pass extraction of each enantiomer of verapamil (VER). A subclinical dose of ketoconazole (8 mg) was coadministered in the perfusion solution to selectively inhibit gut wall CYP3A. Both enantiomers of VER and its main metabolite norverapamil (NOR) as well as the inhibitor ketoconazole were quantified in all plasma compartments by liquid chromatography-tandem mass spectrometry. The overall first-pass metabolic extraction of VER and the metabolite NOR was shown to be stereoselective with the S-isomer being more extensively extracted. For VER the ratio of R- enantiomer to S-enantiomer was greater in the hepatic vein than in the portal vein (approximately 2.2 versus 1.4), indicating that the stereoselective metabolism of VER in pigs mainly occurs on the first pass through the liver and not in the intestine. Ketoconazole increased the area under the curve from time 0 to 6 h and C(max) of R- and S-VER at least 3-fold in the portal vein, most likely explained by inhibition of gut wall metabolism. Conversely, hepatic extraction was increased because the effect of gut wall metabolism was not observed at the peripheral sampling sites. In conclusion, this study provided novel and more direct information on the contribution of the intestine and the liver, respectively, to the overall first-pass extraction of racemic VER.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Farmaceutiska vetenskaper (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Pharmaceutical Sciences (hsv//eng)
Nyckelord
- verapamil
- ketoconazole
- liver metabolism
- intestinal metabolism
- pig metabolism
- first-pass metabolism
- PHARMACY
- FARMACI
- Biopharmaceutics
- Biofarmaci
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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