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• W1820076756 abstract "The pharmacological properties of two glutamate receptor subtypes, GluR-A/B and GluR-B/D, were examined in RNA-injected Xenopus oocytes using two-electrode voltage clamp. Concentration-response relations revealed that the potencies of L-glutamate, kainate, and alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) varied slightly between the two receptor subtypes, but the rank order of agonist potency did not. The EC50 values for GluR-A/B receptors were 3.31 microM for AMPA, 6.16 microM for glutamate, and 57.5 microM for kainate, whereas the EC50 values for GluR-B/D receptors were 5.01 microM, 32.3 microM, and 64.6 microM for AMPA, L-glutamate, and kainate, respectively. The potencies of 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX) and 2,3-dihydroxy-6-nitro-7-sulfamoyl-benzo(f)quinoxaline (NBQX) were quantified by Schild analysis. The potency of NBQX at blocking currents mediated by GluR-A/B receptors changed depending on the agonist used to activate the receptors (pA2 values were as follows: for block of kainate, 7.23 +/- 0.01; L-glutamate, 6.78 +/- 0.02; AMPA, 6.95 +/- 0.02). Differences between agonists were less marked in cells expressing GluR-B/D receptors (pA2 values: kainate, 7.28 +/- 0.01; L-glutamate, 7.30 +/- 0.02; AMPA, 7.35 +/- 0.01). In each case, the slope of the Schild regression was not different from unity, consistent with competitive antagonism of these receptors by NBQX. CNQX also blocked GluR-A/B and GluR-B/D receptors competitively but was less potent than NBQX and did not differentiate between agonists or subunit combination. These data suggest that L-glutamate, kainate, and AMPA bind to different receptor substructures on recombinant AMPA receptors and that NBQX but not CNQX binds to these sites with different affinities. Moreover, because the properties of these binding sites vary between GluR-A/B and GluR-B/D receptors, our findings provide a basis for mutational analysis aimed at identifying receptor domains involved in agonist and antagonist binding." @default.
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• W1820076756 date "1992-11-01" @default.
• W1820076756 modified "2023-09-23" @default.
• W1820076756 title "Complex pharmacological properties of recombinant alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate receptor subtypes." @default.
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