期刊
NEUROSCIENCE LETTERS
卷 452, 期 2, 页码 114-118出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.neulet.2008.12.047
关键词
Dexamethasone; Blood-tumor barrier; Calcium-activated potassium channel; Glioma
资金
- Special fund for scientific research of postdoctoral subjects in China [20060400292]
This study was performed to determine whether dexamethasone (DEX) had an effect on calcium-activated potassium channels (K-Ca channels) and Occludin protein in blood-brain tumor barrier (BTB). Using a rat brain glioma model, we found that the expression Of K-Ca channels protein and Occludin protein was significantly increased in brain tumor tissue after DEX treatment for 3 days. Compared with non-DEX-treated animals, Evans Blue levels were greatly attenuated in DEX-treated animals. These effects were significantly reversed by the glucocorticoid receptor antagonist RU38486. In addition, DEX treatment enhanced the density of l(KCa), in the rat brain microvascular endothelial cells (RBMECs) in vitro BTB. All of these results strongly suggest that DEX could be involved in the regulation of both transcellular and paracellular pathway. (C) 2008 Elsevier Ireland Ltd. All rights reserved.
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