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• W2046571710 abstract "Ethanol ingestion can cause irreversible neuronal and vascular damage in the brain and stroke-like events. Using an intact in vivo rat brain (pial) model, TV image-intensification, cultured cerebral vascular muscle cells, digital-image analysis, and a novel Mg2+ ion-selective electrode to measure extracellular ionized Mg2+, studies were designed to determine whether: 1) perivascular or systemic administration (IV or intra-arterial) of magnesium aspartate HCl (MgA) exert vasodilator effects on arterioles (65–130 μm o.d.) and venules (60–135 μm); 2) nonvasodilator doses of MgA could modify vascular spasms induced by BaCl2 and ethanol; 3) nonvasodilator doses of MgA could ameliorate or prevent the cerebral vascular damage induced by high doses of ethanol; and 4) ethanol depletes cerebral vascular muscle of intracellular Mg ions ([Mg2+]i). Perivascular application of MgA (0.01–100 μmol) produced dose-dependent vasodilatation of cerebral arterioles and venules; arterioles yielded greater vasodilator responses compared to venules. Nonvasodilator doses of Mg (1.0, 4.0 μmol/min), administered IV or intra-arterially, into a branch of the internal carotid artery, prevented: 1) the spasmogenic actions of ethanol and Ba2+; and 2) the vasculotoxic actions (rupture of postcapillary venules and focal hemorrhages) of ethanol. In addition, ethanol depleted cerebral vascular muscle cells of [Mg2+]i; blood levels of ionized Mg2+ rose after IP ethanol. Despite the fact that systemic infusion of low nonvasodilator doses did not result in dilatation of the pial arterioles and venules, plasma total and ionized Mg rose 18–230%, depending upon doses of MgA and time of plasma sampling. These data support the idea that Mg2+ can act as a local vasodilator on brain microvessels and possess antispasmodic properties on brain arterioles and venules. In addition, our results indicate that Mg may posses some unique cerebral vascular protective properties against the vasculotoxic effects of ethanol. Lastly, these findings suggest ethanol-induced cerebrovasospasm and vascular damage appear to be associated with a rapid loss of [Mg2+]i from cerebral vascular muscle cells." @default.
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• W2046571710 date "1998-02-01" @default.
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• W2046571710 title "Alcohol-induced vascular damage of brain is ameliorated by administration of magnesium" @default.
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• W2046571710 doi "https://doi.org/10.1016/s0741-8329(97)00102-x" @default.
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