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• W2160290141 abstract "Tumor necrosis factor-alpha (TNFalpha) is a proinflammatory cytokine implicated in cerebrovascular pathology. The aim of the present study was to characterize the simultaneous effects of an intracarotid administration of TNFalpha on cerebral blood flow (CBF) and the ultrastructure of the blood-brain barrier (BBB) and to determine whether nitric oxide (NO) is a mediator of the TNFalpha-induced alterations in CBF and BBB. TNFalpha (2.5 microg/kg) or saline was infused into the right common carotid artery of male Wistar rats (n = 70). NO production was inhibited with L-NAME (20 mg/kg, i.v.). CBF was monitored for 2 h with laser-Doppler flowmetry. Tissue samples were taken from the unilateral frontoparietal cortex and prepared for electron microscopy. The proportion of capillaries with swollen astrocytic endfeet and the lumen diameter of the capillaries were measured. TNFalpha significantly increased CBF, which reached a maximum of 190% of the baseline 1 h after the cessation of TNFalpha infusion. L-NAME completely prevented the increase in CBF. TNFalpha elevated the swelling of the astrocytic endfeet from a baseline value of 22.4 +/- 9.35% to 64.9 +/- 3.16%. The administration of L-NAME before TNFalpha infusion prevented the astrocytic swelling. These results demonstrate that TNFalpha increases CBF and the swelling of astrocytes through the production of NO. Our data additionally demonstrate that the breakdown of the BBB by circulating TNFalpha may involve the astrocytic endfeet." @default.
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• W2160290141 date "2006-11-01" @default.
• W2160290141 modified "2023-09-27" @default.
• W2160290141 title "Tumor necrosis factor-alpha increases cerebral blood flow and ultrastructural capillary damage through the release of nitric oxide in the rat brain" @default.
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• W2160290141 doi "https://doi.org/10.1016/j.mvr.2006.05.007" @default.
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