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[3H]MDL 105,519 binds with equal high affinity to both assembled and unassembled NR1 subunits of the NMDA receptor.

Abstract：

:[3H]MDL 105,519 (((E)-3-(2-phenyl-2-carboxyethenyl)-4,6-dichloro-1[3H]-indole-2-ca rboxylic acid) is a novel radioligand which binds with high affinity, Kd = 2.5 nM, to the glycine site of adult rodent forebrain, N-methyl-D-aspartate subtype of glutamate receptors. As with other glycine site antagonists, the major determinants for high-affinity binding of [3H]MDL 105,519 resides upon the NRI subunit, and not the NR2 subunits. [3H]MDL 105,519 binds with equal affinity, Kd = 3 nM, to both NR1-1a or NR1-4b splice variants, as well as the NRI-1a/NR2A receptor expressed in human embryonic kidney (HEK) 293 cells. One percent Triton X-100/1 M NaCl solubilises with a recovery of 15+/-3%, a mixed pool of assembled and unassembled forebrain NR1 subunit polypeptides. In this preparation, the recovery of [3H]MK801 ((+)-5-[3H]methyl-10,11-dihydrodibenzo[alpha,d]cyclohepten-5 ,10-imine binding activity (7+/-1%) reflects the amount of assembled NR1 subunits whereas [3H]MDL 105,519 binds quantitatively, with a recovery of 19+/-4% and Kd = 3 nM, to both assembled and unassembled NRI subunits. Therefore, [3H]MDL 105,519 should prove a useful ligand, in conjunction with immunopurification approaches, to address the question of NMDA receptor subunit stoichiometry.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Chazot PL,Reiss C,Chopra B,Stephenson FA

doi

10.1016/s0014-2999(98)00431-2

subject

Has Abstract

pub_date

1998-07-17 00:00:00

pages

137-40

issue

1

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(98)00431-2

journal_volume

353

pub_type

杂志文章

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