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• W2039783522 abstract "This study tests the hypothesis that magnesium, a selective non-competitive antagonist of the NMDA receptor, will attenuate hypoxia-induced alteration in NMDA receptors and preserve MK-801 binding characteristics during cerebral hypoxia in vivo. Anesthetized, ventilated and instrumented newborn piglets were divided into three groups: normoxic controls were compared to untreated hypoxic and Mg(2+)-treated hypoxic piglets. Cerebral hypoxia was induced by lowering the FiO2 to 5-7% and confirmed biochemically by a decrease in the levels of phosphocreatine (82% lower than control). The Mg(2+)-treated group received MgSO4 600 mg/kg over 30 min followed by 300 mg/kg administered during 60 min of hypoxia. Plasma Mg2+ concentrations increased from 1.6 +/- 0.1 mg/dl to 17.7 +/- 3.3 mg/dl. 3H-MK-801 binding was used as an index of NMDA receptor modification. The Bmax in control, hypoxic and Mg(2+)-treated hypoxic piglets was 1.09 +/- 0.17, 0.70 +/- 0.25 and 0.96 +/- 0.14 pmoles/mg protein, respectively. The Kd for the same groups were 10.02 +/- 2.04, 4.88 +/- 1.43 and 8.71 +/- 2.23 nM, respectively. The Bmax and Kd in the hypoxic group were significantly lower compared to the control and Mg(2+)-treated hypoxic groups, indicating a preservation of NMDA receptor number and affinity for MK-801 during hypoxia with Mg2+. The activity of Na+, K+ ATPase, a marker of neuronal membrane function, was lower in the hypoxic group compared to the control and Mg(2+)-treated hypoxic groups. These findings show that MgSO4 prevents the hypoxia-induced modification of the NMDA receptor and attenuates neuronal membrane dysfunction.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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• W2039783522 date "1994-04-01" @default.
• W2039783522 modified "2023-10-18" @default.
• W2039783522 title "Protective effect of MgSO4 infusion on NMDA receptor binding characteristics during cerebral cortical hypoxia in the newborn piglet" @default.
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• W2039783522 doi "https://doi.org/10.1016/0006-8993(94)90357-3" @default.
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