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Fluids and Barriers of the CNS
Published in: Fluids and Barriers of the CNS 1/2017

Open Access 01-12-2017 | Research

Revisiting atenolol as a low passive permeability marker

Authors: Xiaomei Chen, Tim Slättengren, Elizabeth C. M. de Lange, David E. Smith, Margareta Hammarlund-Udenaes

Published in: Fluids and Barriers of the CNS | Issue 1/2017

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Abstract

Background

Atenolol, a hydrophilic beta blocker, has been used as a model drug for studying passive permeability of biological membranes such as the blood–brain barrier (BBB) and the intestinal epithelium. However, the extent of S-atenolol (the active enantiomer) distribution in brain has never been evaluated, at equilibrium, to confirm that no transporters are involved in its transport at the BBB.

Methods

To assess whether S-atenolol, in fact, depicts the characteristics of a low passive permeable drug at the BBB, a microdialysis study was performed in rats to monitor the unbound concentrations of S-atenolol in brain extracellular fluid (ECF) and plasma during and after intravenous infusion. A pharmacokinetic model was developed, based on the microdialysis data, to estimate the permeability clearance of S-atenolol into and out of brain. In addition, the nonspecific binding of S-atenolol in brain homogenate was evaluated using equilibrium dialysis.

Results

The steady-state ratio of unbound S-atenolol concentrations in brain ECF to that in plasma (i.e., Kp,uu,brain) was 3.5% ± 0.4%, a value much less than unity. The unbound volume of distribution in brain (Vu, brain) of S-atenolol was also calculated as 0.69 ± 0.10 mL/g brain, indicating that S-atenolol is evenly distributed within brain parenchyma. Lastly, equilibrium dialysis showed limited nonspecific binding of S-atenolol in brain homogenate with an unbound fraction (fu,brain) of 0.88 ± 0.07.

Conclusions

It is concluded, based on Kp,uu,brain being much smaller than unity, that S-atenolol is actively effluxed at the BBB, indicating the need to re-consider S-atenolol as a model drug for passive permeability studies of BBB transport or intestinal absorption.
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Metadata
Title
Revisiting atenolol as a low passive permeability marker
Authors
Xiaomei Chen
Tim Slättengren
Elizabeth C. M. de Lange
David E. Smith
Margareta Hammarlund-Udenaes
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Fluids and Barriers of the CNS / Issue 1/2017
Electronic ISSN: 2045-8118
DOI
https://doi.org/10.1186/s12987-017-0078-x

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