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- W2079208301 abstract "A radiation-induced blood–brain barrier (BBB) breakdown has been supposed to explain the acute radiation syndrome and the delayed brain radiation injury, but it has been clearly demonstrated only at high doses. In a previous study (Diserbo et al., 2002), we showed that non-lethal total body irradiation produced an early transient increase in BBB permeability in rats but the underlying mechanisms of radiation-induced BBB breakdown remain unclear. In the present work, the effects of ionizing radiation were studied on an in vitro BBB model. Gamma irradiation induced an increase in [14C]-sucrose BBB permeability that can be detected 72 h after exposure at doses up to 4 Gy. This increase was more important 8 days after irradiation and could be limited by dexamethasone treatment. An increase in fluorescein and FITC-dextrans (4 kDa/70 kDa) permeability was also observed, which can be related to a substantial opening of endothelial cell tight-junctions but without massive modification of tight-junction protein (ZO-1, ZO-2, claudin-5, occludin) immunolabeling even 8 days after 25 Gy exposure. Formation of actin stress fibers occurred in endothelial cells 8 days after 25 Gy exposure. A progressive decrease in cellular density associated with a simultaneous spreading of the endothelial cells was also observed after irradiation. Anti-γH2AX immunolabeling was used to investigate both DNA double-strand break induction and repair rates in endothelial cells. It revealed long-lasting DNA double-strand breaks after gamma irradiation. A better understanding and awareness of these phenomena are essential for designing appropriate pharmacotherapy in radiation-therapy and treatment of accidental overexposure." @default.
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- W2079208301 date "2012-01-01" @default.
- W2079208301 modified "2023-10-01" @default.
- W2079208301 title "Radiation-induced blood–brain barrier damages: An in vitro study" @default.
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- W2079208301 doi "https://doi.org/10.1016/j.brainres.2011.11.022" @default.
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