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The Strongest Expression of P-Glycoprotein is in the Blood-Brain Barrier

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Biology and Physiology of the Blood-Brain Barrier

Part of the book series: Advances in Behavioral Biology ((ABBI,volume 46))

Summary

P-glycoprotein (P-gp), an active efflux pump of antitumor drugs, is strongly expressed in endothelial cells of the blood brain barrier (BBB). Two proteins (155 and 190 kDa) were detected by Western blot analysis of beef and rat capillaries with the monoclonal antibody (MAb) C219. In order to characterize the nature of these proteins, biochemical studies were performed in comparison with P-gp from the CHRC5 tumoral cell line. Results suggest that only p155 is the P-gp in BBB and that MAb C219 cross-reacts with a 190 kDa MDR-unrelated glycosylated protein. Western blot analysis shows presence of P-gp in several tissues and presence of p190 in some tissues. P-glycoprotein was predominantly expressed in brain capillaries compared to other tissues.

Résumé

La P-glycoprotéine (P-gp), pompe membranaire à efflux sortant ATP-dépendante, est fortement exprimée dans les cellules endothéliales de la barrière hémato-encéphalique (BHE). L’utilisation de l’anticorps monoclonal (Mab) C219 a permis de mettre en évidence par immunotransfert l’expression de deux protéines (155 et 190 kD) dans les capillaires de rat et de boeuf. Afin de caractériser la nature de ces protéines, des études biochimiques ont été réalisées en comparant l’expression de la P-gp dans les capillaires cérébraux et dans la lignée tumorale CHRC5. Les résultats suggèrent que seule la révélation par l’anticorps C219 de la protéine de 155 kD est spécifique de la P-glycoprotéine. L’anticorps C219 semble avoir une réaction croisée avec une glycoprotéine de 190 kD n’appartenant pas à la famille des protéines de résistance multidrogue. Des expériences d’immunotranfert montrent que la P-glycoprotéine est présente dans de nombreux tissus et que la protéine P190 est présente seulement dans quelques tissus. L’expression de la P-gp est la plus forte dans les capillaires cérébraux en comparaison des autres tissus étudiés.

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© 1996 Springer Science+Business Media New York

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Beaulieu, E., Demeule, M., Averill-Bates, D.A., Béliveau, R. (1996). The Strongest Expression of P-Glycoprotein is in the Blood-Brain Barrier. In: Couraud, PO., Scherman, D. (eds) Biology and Physiology of the Blood-Brain Barrier. Advances in Behavioral Biology, vol 46. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9489-2_29

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  • DOI: https://doi.org/10.1007/978-1-4757-9489-2_29

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4757-9491-5

  • Online ISBN: 978-1-4757-9489-2

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