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Evaluation of Capacity-limited First-pass Effect Through Liver by Three-points Sampling in Portal and Hepatic Veins and Systemic Artery

Overview
Journal Pharm Res
Specialties Pharmacology
Pharmacy
Date 2002 Jul 24
PMID 12134957
Citations 2
Authors
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Abstract

Purpose: The three-points method was newly developed by sampling the portal and hepatic veins and systemic artery. A model of hepatic local disposition with the Michaelis-Menten elimination was proposed to explain the concentration dependency of the hepatic recovery ratio (F(H)).

Methods: 5-fluorouracil (5-FU) was selected as a model drug. 5-FU was administered orally 90 min after its intraarterial dose. Blood specimens in both femoral artery and hepatic vein were sampled after intraarterial dose, and blood specimens in both femoral artery and portal vein were taken after oral administration.

Results: It was shown that F(H) increased with an increase in the input drug concentration into the liver. The mean absorption time (MAT) estimated by nonlinear analysis agreed with the mean local absorption time (t(n)) whereas MAT by linear analysis was significantly smaller than t(a).

Conclusions: The three-points method was newly developed, and the proposed nonlinear model explained well the capacity-limited elimination of 5-FU through the liver. MAT by the nonlinear analysis was in good agreement with t(a).

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References
1.
Ito T, Yamaoka K, Nakagawa T . Short-period double-dosing for simultaneous evaluation of intestinal absorption and hepatic disposition in a single conscious rat using cephalexin as test drug. J Pharm Pharmacol. 1998; 49(12):1189-94. DOI: 10.1111/j.2042-7158.1997.tb06068.x. View

2.
Harris B, Song R, Soong S, Diasio R . Circadian variation of 5-fluorouracil catabolism in isolated perfused rat liver. Cancer Res. 1989; 49(23):6610-4. View

3.
Nakayama H, Kinouchi T, Kataoka K, Akimoto S, Matsuda Y, Ohnishi Y . Intestinal anaerobic bacteria hydrolyse sorivudine, producing the high blood concentration of 5-(E)-(2-bromovinyl)uracil that increases the level and toxicity of 5-fluorouracil. Pharmacogenetics. 1997; 7(1):35-43. DOI: 10.1097/00008571-199702000-00005. View

4.
Kwan K . Oral bioavailability and first-pass effects. Drug Metab Dispos. 1998; 25(12):1329-36. View

5.
Ueda S, Yamaoka K, Nakagawa T . Effect of pentobarbital anaesthesia on intestinal absorption and hepatic first-pass metabolism of oxacillin in rats, evaluated by portal-systemic concentration difference. J Pharm Pharmacol. 1999; 51(5):585-9. DOI: 10.1211/0022357991772682. View