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Pharmacological characterization of interactions of RO 25-6981 with the NR2B (ε2) subunit
Journal article

Pharmacological characterization of interactions of RO 25-6981 with the NR2B (ε2) subunit

David R. Lynch, Sandra S. Shim, Kristen M. Seifert, Sushmithi Kurapathi, Vincent Mutel, Michael J. Gallagher and Rodney P. Guttmann
European Journal of Pharmacology, Vol.416, pp.185-195
416
2001
DOI: https://doi.org/10.1016/S0014-2999(01)00868-8
PMID: 11290368
Web of Science ID: WOS:000167968400002

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Abstract

We used ligand binding to ascertain whether the pharmacological actions of RO 25-6981 [(R:(*), S:(*))-α-(4-hydroxyphenyl)-β-methyl-4-(phenylmethyl)-1-piperidinepropanol] match those of other NR2B (ε2) subunit specific agents. RO 25-6981 inhibited binding of 125I-MK801 [iodo-(+)-5-methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohept-5,10-imine maleate] to receptors made from NR1a/ε2 but not NR1a/ε1. Increasing the concentration of spermidine did not change the efficacy of RO 25-6981 and minimally changed the IC50 value. Chimeric ε1/ε2 receptors demonstrated that the structural determinants for high affinity actions of RO 25-6981 were contained completely within the first 464 amino acids, but no receptor retained wildtype features when the size of the ε2 component was decreased further. ε1Q336R receptors were more inhibited by ifenprodil and RO 25-9681 than wildtype ε1 receptors in ligand binding assays but not in functional assays. Selected mutations of ε2E200 and ε2E201 also decreased the sensitivity of receptors to ifenprodil and RO 25-6981. These results suggest that RO 25-6981 shares structural determinants with ifenprodil and other modulators in the NR2B subunit.

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