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- W1978989737 abstract "Abstract: The potent noncompetitive N-methyl-D-aspartate (NMDA) receptor antagonist [3H]MK-801 bound with nanomolar affinity to rat brain membranes in a reversible, saturable, and stereospecific manner. The affinity of [3H]-MK-801 was considerably higher in 5 mM Tris-HCl (pH 7.4) than in previous studies using Krebs-Henseleit buffer. [3H]MK-801 labels a homogenous population of sites in rat cerebral cortical membranes with KD of 6.3 nM and Bmax of 2.37 pmol/mg of protein. This binding was unevenly distributed among brain regions, with hippocampus > cortex > olfactory bulb = striatum > medulla-pons, and the cerebellum failing to show significant binding. Detailed pharmacological characterization indicated [3H]HIMK-801 binding to a site which was competitively and potently inhibited by known noncompetitive NMDA receptor antagonists, such as phencyclidine, thienylcyclohexylpiperidine (TCP), ketamine, N-allylnormetazocine (SKF 10,047), cyclazocine, and etoxadrol, a specificity similar to sites labelled by [3H]TCP. These sites were distinct from the high-affinity sites labelled by the σ receptor ligand (+)-[3H]SKF 10,047. [3H]MK-801 binding was allosterically modulated by the endogenous NMDA receptor antagonist Mg2+ and by other active divalent cations. These data suggest that [3H]MK-801 labels a high-affinity site on the NMDA receptor channel complex, distinct from the NMDA recognition site, which is responsible for the blocking action of MK-801 and other noncompetitive NMDA receptor antagonists." @default.
- W1978989737 created "2016-06-24" @default.
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- W1978989737 date "1988-01-01" @default.
- W1978989737 modified "2023-09-28" @default.
- W1978989737 title "[<sup>3</sup>H]MK-801 Labels a Site on the N-Methyl-D-Aspartate Receptor Channel Complex in Rat Brain Membranes" @default.
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- W1978989737 doi "https://doi.org/10.1111/j.1471-4159.1988.tb13260.x" @default.
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