Summary
Blood-brain barrier (BBB) has been neglected in pharmacological interventions of ischemic brain although it can be reached easily after systemic administration of a drug. Brain capillary endothelial cells (BCEC) may contain NMDA receptors so that the antagonist MK-80I was studied to protect BBB function. Oxygen deficiency is a main limitation during ischemia known to generate free radicals. During hypoxia and reoxygenation, an increase of radical-induced lipid peroxidation in both BCEC and astrocytes (AC) was found, accompanied by disturbances of BBB function. Therefore, the radical scavenging lazaroid U83836E was also studied. Upon hypoxia, the permeability of the barrier (BCEC and AC, cultured separately on the two sides of a filter) increased. This effect was intensified during the following reoxygenation. MK-801 and U83836E reduced the hypoxia-induced increase of permeability.
Résumé
La barrière hémato-encéphalique (BBB) a été négligée dans des interventions pharmacologiques du cerveau ischémique bien qu’il ne soit pas difficile de le démontrer après application d’un médicament. Des cellules endothéliales de cerveau (BCEC) possèdent des récepteurs NMDA de sorte que l’antagoniste MK-801 a été appliqué pour protéger la fonction de la barrière hémato-encéphalique. Un manque d’oxygène est la limitation essentielle pendant l’ischémie en produisant des radicaux libres. Pendant l’hypoxie et la reoxygenation une augmentation des taux de la péroxidation des lipides induite par des radicaux dans des BCEC et des astrocytes (AC) a été trouvée,ainsi que des modifications de la fonction de la BBB. De plus, l’aminostéroide U83836E, qui est un agent de spin-trap a été étudié. Sous hypoxie la perméabilité de la barrière formée de BCEC et de AC cultivés séparément sur les deux cotés d’un filtre a été augmentée, et le phénomène s’est intensifié après la réoxygenation.suivante. MK-801 et U83836E ont réduit le taux d’accroissement de la perméabilité provoqué par l’hypoxie.
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Giese, H., Mertsch, K., Haselof, R.F., Härtel, F.H., Blasig, I.E. (1996). Hypoxia and Reoxygenation of a Cellular Barrier Consisting of Brain Capillary Endothelial Cells and Astrocytes. 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_51
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