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British Journal of Pharmacology logoLink to British Journal of Pharmacology
. 1996 Apr;117(8):1803–1808. doi: 10.1111/j.1476-5381.1996.tb15358.x

Investigation of the involvement of the N-methyl-D-aspartate receptor macrocomplex in the development of spermine-induced CNS excitation in vivo.

K M Doyle 1, G G Shaw 1
PMCID: PMC1909563  PMID: 8732295

Abstract

1. The involvement of the N-methyl-D-aspartate (NMDA) receptor macrocomplex in the development of spermine-induced CNS excitation in vivo was investigated. 2. Injection of 100 micrograms of spermine into the left lateral cerebral ventricle of female Laca mice (20-25 g) resulted in the development of two distinct phases of CNS excitatory effects which were quantified by a scoring system. 3. The first phase effects occurred within minutes of injection and generally lasted for about 1 h. Most mice showed scratching of the upper body, frequent face washing and some mice developed clonic convulsions. By about 2 h after injection, the second phase of effects began to develop in the form of body tremor which worsened with time and culminated in fatal tonic convulsions, generally within 8 h of injection. 4. Pretreatment of the mice with dizocilpine (0.3 mg kg-1, i.p.) resulted in antagonism of the first phase of spermine-induced effects, but a higher dose (0.3 mg kg-1, (x2), i.p.) was necessary to inhibit the second phase effects. 5. Whereas the glutamate antagonist, 3-((R)-2-carboxypiperazin-4-yl) propyl-1-phosphonic acid (D-CPP) (10, 20 mg kg-1, i.p.), the glycine antagonist 7-chlorokynurenate (10, 30, 50 nmol, i.c.v.), or the polyamine antagonist ifenprodil (30, 60 mg kg-1, i.p.) antagonized the first phase of effects produced by spermine, these agents given as monotherapy, were ineffective against the development of the second phase of effects. 6. Co-administration of ifenprodil with either D-CPP or 7-chlorokynurenate resulted in a dose-dependent antagonism of the development of the second phase of spermine-induced effects. 7. It is concluded that the development of the two temporally distinct phases of spermine-induced effects may be mediated by pharmacologically distinct mechanisms, although the results suggest that the NMDA receptor macrocomplex may be involved in both phases of effects. Furthermore, a moderate dose of D-CPP or 7-chlorokynurenate appears to enhance the inhibitory potential of ifenprodil in vivo.

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Selected References

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