X 100 → Nmda

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The effect on the TCP (1-[1-(2-thienyl)-cyclohexyl]piperidine) binding was measured in rat brain synaptic membranes (SPM) prepared as previously described [J. B. Monahan & J. Michel; J. Neurochem. 48:1699-1708 (1987)]. Prior to their use in the binding assay, frozen SPM were thawed, diluted twenty fold with 50 mM Tris/acetate (pH 7.4 containing 0.04% (v/v) TritOn X-100), incubated for 30 min. at 37° C. and centrifuged at 95,000×g for 15 min. The Triton X-100 treated SPM were washed with 5 mM Tris/HCl, pH 7.4 and centrifuged a total of six times. The compound of Example #7 was incubated at different concentrations with SPM (0.2-0.4 mg protein) and 2 nM tritiated TCP, in a total volume of 0.5 ml of 5 mM Tris/HCl buffer pH 7.4 at 25° C. for 60 min. The samples were filtered through glass fiber filters (Schleicher & Schuell π32) which have been pretreated with 0.05% (v/v) polyethylenimine, washed 4 times with 2 ml of ice-cold 5 mM Tris/HCl buffer, and then counted on a Beckman LS 5800 liquid scintillation counter with automatic corrections for quenching and counting efficiency. Inhibition of TCP binding was measured as a decrease in the binding in the presence of 0.05 mM L-glutamate. Non-specific binding was defined as the residual binding in the presence of 60 mM phencyclidine. Results are shown in Table II.

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