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. 1995 Feb;114(4):797–804. doi: 10.1111/j.1476-5381.1995.tb13275.x

Modulation of NMDA effects on agonist-stimulated phosphoinositide turnover by memantine in neonatal rat cerebral cortex.

R Mistry 1, R Wilke 1, R A Challiss 1
PMCID: PMC1510213  PMID: 7773540

Abstract

1. The ability of memantine (1-amino-3,5-dimethyladamantane) to antagonize the modulatory effects of N-methyl-D-aspartate (NMDA) on phosphoinositide turnover stimulated by muscarinic cholinoceptor- and metabotropic glutamate receptor-agonists has been examined in neonatal rat cerebral cortex slices. 2. Memantine antagonized the inhibitory effect of NMDA (100 microM) on both total [3H]-inositol phosphate ([3H]-InsPx) and inositol 1,4,5-trisphosphate (Ins(1,4,5)P3) mass accumulations stimulated by carbachol (1 mM) with EC50 values of 21 and 16 microM respectively. 3. Memantine concentration-dependently antagonized (IC50 24 microM) the ability of NMDA (10 microM) to potentiate [3H]-InsPx accumulation in response to a sub-maximal concentration of the metabotropic glutamate receptor agonist, 1S,3R-ACPD (10 microM). 4. The small (approx. 3 fold), concentration-dependent increase in [3H]-InsPx accumulation stimulated by NMDA was completely antagonized by the prototypic NDMA receptor-channel blocker, MK-801 (1 microM) at all concentrations of NDMA studied (1-1000 microM). In contrast, antagonism by memantine (100 microM) was observed only at low concentrations of NMDA (1-10 microM), whilst [3H]-InsPx accumulation stimulated by high concentrations of NMDA (300-1000 microM) was markedly enhanced by memantine. 5. Assessment of the incorporation of [3H]-inositol into inositol phospholipids revealed that memantine (100 microM) caused an approximate 2 fold increase in the labelling of phosphatidylinositol, phosphatidylinositol 4-phosphate and phosphatidylinositol 4,5-bisphosphate.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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