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. 1988 Nov;95(3):932–938. doi: 10.1111/j.1476-5381.1988.tb11723.x

Characterization of the binding of [3H]-CGS 19755: a novel N-methyl-D-aspartate antagonist with nanomolar affinity in rat brain.

D E Murphy 1, A J Hutchison 1, S D Hurt 1, M Williams 1, M A Sills 1
PMCID: PMC1854225  PMID: 2850065

Abstract

1. CGS 19755 (cis-4-phosphonomethyl-2-piperidine carboxylic acid), a rigid analogue of 2-amino-5-phosphonopentanoic acid (AP5), is one of the most potent competitive N-methyl-D-aspartate (NMDA) antagonists described. Using Triton-treated crude synaptic membranes from rat brain, binding studies indicated that [3H]-CGS 19755 bound with high affinity and selectivity to the NMDA-type excitatory amino acid receptor. 2. [3H]-CGS 19755 binding was saturable, reversible, heat-labile, pH-dependent and linear with protein concentration. Specific binding represented 80-85% of the total amount bound. 3. Using a centrifugation assay, saturation experiments revealed two distinct binding components with Kd values of 9 and 200 nM, and corresponding Bmax values of 0.55 and 1.00 pmol mg-1 protein. In contrast, a single binding component with a Kd value of 24 nM and an apparent Bmax value of 0.74 pmol mg-1 protein was observed with a filtration assay. 4. Competition experiments in which both assay techniques were used, showed that [3H]-CGS 19755 selectively labels the NMDA receptor. The most active inhibitors of [3H]-CGS 19755 binding were L-glutamate and CGS 19755 (IC50 values = 100 nM). 5. In the centrifugation assay, a number of excitatory amino acids were found to generate shallow inhibition curves, and computer analysis indicated the presence of two binding components. The quisqualate receptor ligand AMPA (D,L-alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate), kainic acid and the non-competitive NMDA antagonists, such as phencyclidine, tiletamine and MK-801, were without activity.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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