Abstract
Purpose
The function of ABCG2 (BCRP), a member of the ATP-binding cassette (ABC) superfamily of membrane-associated drug transporters, at the blood-brain barrier remains highly controversial. This project investigates the functional expression of endogenous ABCG2 in cultures of human and rodent brain cellular compartments.
Materials and Methods
RT-PCR, western blot and fluorescent immunocytochemical analyses were performed on ABCG2-overexpressing human breast cancer (MCF-MX100) cells, human and rat brain microvessel endothelial (HBEC and RBE4, respectively), and rat glial cells.
Results
RT-PCR analysis detected ABCG2 mRNA in all the cell culture systems. Western blot analysis with anti-ABCG2 monoclonal BXP-21 antibody detected a robust band at ∼72 kDa in the ABCG2-overexpressing MCF-MX100 cell line, whereas low expression was found in human and rat brain cell systems. Immunofluorescence microscopy detected predominant plasma membrane localization of ABCG2 in MCF-MX100 cells but weak signal in all brain cellular compartments. In the presence of ABCG2 inhibitors, the accumulation of 3H-mitoxantrone and pheophorbide A, two established ABCG2 substrates, was significantly increased in MCF-MX100 cells but not in the human and rodent brain cell culture systems.
Conclusions
Our data show low endogenous ABCG2 protein expression, localization and activity in cultures of human and rat brain microvessel endothelial and glial cells.
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Abbreviations
- ABC:
-
ATP-binding cassette
- BCRP:
-
breast cancer resistance protein
- HBEC:
-
human brain endothelial cells
- MRP:
-
multidrug resistance-associated protein
- P-gp:
-
P-glycoprotein
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Acknowledgments
This work is supported by grants to Reina Bendayan from the Canadian Institutes of Health Research (MOP-56976) and the Ontario HIV Treatment Network (OHTN). Gloria Lee is a recipient of an OHTN Studentship Award. Alexander Prat holds the Donald Paty Career Award from the Multiple Sclerosis Society of Canada as well as “Chercheur Boursier Junior” from the Fonds de la Recherche en Sante du Quebec. Karolina Wosik is a recipient of a fellowship from the Multiple Sclerosis Society of Canada. We would like to thank Dr. J. Henderson for the help and advice with the undertaking of fluorescence microscopy studies and Drs S. Bates and F. Roux for providing the MCF-7 and RBE4 cell culture systems, respectively.
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Lee, G., Babakhanian, K., Ramaswamy, M. et al. Expression of the ATP-binding Cassette Membrane Transporter, ABCG2, in Human and Rodent Brain Microvessel Endothelial and Glial Cell Culture Systems. Pharm Res 24, 1262–1274 (2007). https://doi.org/10.1007/s11095-007-9244-1
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DOI: https://doi.org/10.1007/s11095-007-9244-1