A substance P antagonist increases brain intracellular free magnesium concentration after diffuse traumatic brain injury in rats.

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 (Mg(f)) 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. Mg(f) was calculated from the chemical shift of the beta ATP. Before injury, Mg(f) was 0.51 +/- 0.05 mM (SEM). RESULTS:By 4 hr after injury, Mg(f) had significantly declined to 0.27 +/- 0.02 mM in saline treated rats. In contrast, rats treated with n-acetyl tryptophan had a Mg(f) 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.

journal_name

J Am Coll Nutr

authors

Vink R,Donkin JJ,Cruz MI,Nimmo AJ,Cernak I

doi

10.1080/07315724.2004.10719398

subject

Has Abstract

pub_date

2004-10-01 00:00:00

pages

538S-540S

issue

5

eissn

0731-5724

issn

1541-1087

pii

23/5/538S

journal_volume

23

pub_type

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