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Further studies on the Dmt-Tic pharmacophore: hydrophobic substituents at the C-terminus endow delta antagonists to manifest mu agonism or mu antagonism.

Abstract：

:Twenty N- and/or C-modified Dmt-Tic analogues yielded similar K(i) values with either [(3)H]DPDPE (delta(1) agonist) or [(3)H]N, N(Me)(2)-Dmt-Tic-OH (delta antagonist). N-Methylation enhanced delta antagonism while N-piperidine-1-yl, N-pyrrolidine-1-yl, and N-pyrrole-1-yl were detrimental. Dmt-Tic-X (X = -NHNH(2), -NHCH(3), -NH-1-adamantyl, -NH-tBu, -NH-5-tetrazolyl) had high delta affinities (K(i) = 0.16 to 1 nM) with variable mu affinities to yield nonselective or weakly mu-selective analogues. N, N-(Me)(2)Dmt-Tic-NH-1-adamantane exhibited dual delta and mu receptor affinities (K(i)delta = 0.16 nM and K(i)mu = 1.12 nM) and potent delta antagonism (pA(2) = 9.06) with mu agonism (IC(50) = 16 nM). H-Dmt-betaHTic-OH (methylene bridge between C(alpha) of Tic and carboxylate function) yielded a biostable peptide with high delta affinity (K(i) = 0.85 nM) and delta antagonism (pA(2) = 8.85) without mu bioactivity. Dmt-Tic-Ala-X (X = -NHCH(3), -OCH(3), -NH-1-adamantyl, -NHtBu) exhibited high delta affinities (K(i) = 0.06 to 0.2 nM) and elevated mu affinities (K(i) = 2.5 to 11 nM), but only H-Dmt-Tic-Ala-NH-1-adamantane and H-Dmt-Tic-Ala-NHtBu yielded delta receptor antagonism (pA(2) = 9.29 and 9.16, respectively). Thus, Dmt-Tic with hydrophobic C-terminal substituents enhanced mu affinity to provide delta antagonists with dual receptor affinities and bifunctional activity.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Salvadori S,Guerrini R,Balboni G,Bianchi C,Bryant SD,Cooper PS,Lazarus LH

doi

10.1021/jm990165m

keywords:

subject

Has Abstract

pub_date

1999-12-02 00:00:00

pages

5010-9

issue

24

eissn

0022-2623

issn

1520-4804

pii

jm990165m

journal_volume

42

pub_type

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