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• W2068486576 abstract "Objective: Magnesium (Mg) deficiency has been shown to increase substance P release and induce a pro-inflammatory response that can be attenuated with the administration of a substance P-antagonist. Neurogenic inflammation has also been implicated in traumatic brain injury (TBI), a condition where brain intracellular free magnesium (Mgf) decline is known to occur and has been correlated with functional outcome. We therefore examined whether a substance P antagonist restores brain intracellular free magnesium concentration following TBI.Methods: Male, adult Sprague-Dawley rats were injured using the Cernak impact acceleration model of diffuse TBI. At 30 min after injury, animals were administered either 0.25 mg/kg i.v. n-acetyl tryptophan or equal volume saline. Prior to and 4 h after induction of injury, phosphorus magnetic resonance spectra were acquired using a 7-tesla magnet interfaced with a Bruker console. Mgf was calculated from the chemical shift of the beta ATP. Before injury, Mgf was 0.51 ± 0.05 mM (SEM).Results: By 4 hr after injury, Mgf had significantly declined to 0.27 ± 0.02 mM in saline treated rats. In contrast, rats treated with n-acetyl tryptophan had a Mgf of 0.47 ± 0.06 mM at 4 h after injury, which was not significantly different from preinjury values. There were no significant differences in pH between the treatment groups.Conclusion: It seems that any beneficial effect of a substance P antagonist on functional outcome following TBI may be related to improvement in brain Mg homeostasis induced by the compound." @default.
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• W2068486576 date "2004-10-01" @default.
• W2068486576 modified "2023-09-26" @default.
• W2068486576 title "A Substance P Antagonist Increases Brain Intracellular Free Magnesium Concentration after Diffuse Traumatic Brain Injury in Rats" @default.
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• W2068486576 doi "https://doi.org/10.1080/07315724.2004.10719398" @default.
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