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Endothelin-1 Reduces P-Glycoprotein Transport Activity in an In Vitro Model of Human Adult Blood–brain Barrier

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Abstract

Aims It is a huge challenge to understand the blood–brain barrier (BBB), which is a key element in neuroinflammation associated with many brain diseases. The BBB also regulates the passage of xenobiotics into the central nervous system (CNS), and therefore influences drug efficacy. This may be due to the presence of ATP binding cassette transporters such as P-glycoprotein (Pgp) on the BBB, which are efflux pumps known to transport many drugs. The peptide endothelin 1 (ET-1) is involved in different kinds of CNS diseases and neuroinflammation, and is known to modulate Pgp transport activity. Although there are data from animal models, data from human models are scarce. We evaluated Pgp expression and transport activity in adult human brain microvascular endothelial cells (HBMECs) when exposing an adult human in vitro BBB model to ET-1. Methods Adult HBMECs were cocultured with human adult glial cells on a TranswellsR to mimic blood and CNS compartments. These human in vitro BBBs were exposed for 24 h to 100 nM and 10 nM ET-1. Pgp expression was assessed by flow cytometry and its transport activity by measuring radiolabelled digoxin passage. Results After exposure to ET-1, flow cytometry showed no shift of fluorescence intensity for a Pgp specific antibody. The passage of digoxin increased with a significant decrease of Q ratio for 10 nM ET-1. Conclusion Our results show that ET-1 has no effect on Pgp expression of adult HBMECs, but does modulate Pgp transport activity.

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Acknowledgements

We would like to thank the ANRS (Agence Nationale de Recherche sur le SIDA) for financial support. We would also like to thank Gabriel Gras (CEA Fontenay-aux-Roses, France) and Jean-François Heilier (Université Catholique de Louvain, Belgium) for their advice in statistics.

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Correspondence to Aloïse Mabondzo.

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Hembury, A., Mabondzo, A. Endothelin-1 Reduces P-Glycoprotein Transport Activity in an In Vitro Model of Human Adult Blood–brain Barrier. Cell Mol Neurobiol 28, 915–921 (2008). https://doi.org/10.1007/s10571-008-9277-y

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