Nitric oxide induced sinusoidal relaxation after a propranolol priming dose in the perfused rat liver reduces propranolol availability on subsequent dosing.

Abstract:

:1. The present study sought to explain the mechanism leading to reduced availability of propranolol when given after a priming dose in the single-pass perfused rat liver. 2. Extracellular sucrose space (as a measure of sinusoidal relaxation) in perfused rat liver before and after propranolol or propranolol and N(G)-nitro-L-arginine methyl ester (L-NAME; nitric oxide (NO) synthase inhibitor) treatment were examined. The results showed that propranolol induces sinusoidal relaxation in the perfused liver and this effect could be abolished by NO synthase inhibitor L-NAME. 3. Two bolus injections of propranolol were given to the isolated perfused rat liver and outflow concentration-time profiles of intact propranolol were determined. A two-phase physiologically based organ pharmacokinetic model was applied to estimate hepatocellular influx, efflux, binding, ion-trapping and metabolic elimination pharmacokinetic parameters for propranolol. The recovery of propranolol in the second injection was approximately 54% of that in the first injection. The permeability-surface area product, the binding and the intrinsic clearance all increased significantly after prior exposure of the rat liver to the first bolus of propranolol (P < 0.05). 4. Based on the findings of the present study, we propose that the most likely explanation for the reduced availability of a second propranolol dose (after administration of a priming dose) in the perfused liver is a consequence of the NO-mediated sinusoidal relaxation effect of propranolol, arising from the priming dose. This observation supports the view that the pharmacokinetics of some drugs might be altered by the pharmacodynamic effects of the same drug given earlier in the perfused liver.

authors

Liu X,Zou Y,Khlentzos AM,Yang Y,Nikolovski J,Weiss M,Roberts MS

doi

10.1111/j.1440-1681.2010.05434.x

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

1028-33

issue

10

eissn

0305-1870

issn

1440-1681

pii

CEP5434

journal_volume

37

pub_type

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