Bivalent ligands are molecules which contain two pharmacophores, separated by a connecting chain (spanner). When the spanner is of sufficient length, the pharmacophores in such ligands have the potential for simultaneously occupying (bridging) proximal receptors. Because the constitution of the pharmacophore is not altered as the spanner length is changed, bivalent ligands are unique probes to explore organizational relationships between proximal recognition sites. Using this approach, we are employing several series of bivalent ligands to investigate different opioid receptor types. Such ligands are composed of opioid agonist or antagonist pharmacophore and glycine-containing spanners. Monovalent ligands, containing a chain similar to the spanner of the corresponding bivalent ligand series are used as reference compounds. The guinea pig ileum and mouse vas deferens preparations will be employed together with binding studies to delineate the relationship between spanner length and potency.

Agency
National Institute of Health (NIH)
Institute
National Institute on Drug Abuse (NIDA)
Type
Research Project (R01)
Project #
5R01DA002659-04
Application #
3207489
Study Section
(DABB)
Project Start
1981-09-30
Project End
1988-06-30
Budget Start
1986-07-01
Budget End
1987-06-30
Support Year
4
Fiscal Year
1986
Total Cost
Indirect Cost
Name
University of Minnesota Twin Cities
Department
Type
Schools of Pharmacy
DUNS #
168559177
City
Minneapolis
State
MN
Country
United States
Zip Code
55455
Takemori, A E; Portoghese, P S (1992) Selective naltrexone-derived opioid receptor antagonists. Annu Rev Pharmacol Toxicol 32:239-69
Levine, A S; Grace, M; Billington, C J et al. (1990) Nor-binaltorphimine decreases deprivation and opioid-induced feeding. Brain Res 534:60-4
Portoghese, A S; Lipkowski, A W; Takemori, A E (1987) Bimorphinans as highly selective, potent kappa opioid receptor antagonists. J Med Chem 30:238-9
Urbanczyk-Lipkowska, Z; Lipkowski, A W; Etter, M C et al. (1987) X-ray crystal structure of the opioid ligand naltrexonazine. J Med Chem 30:1489-94
Portoghese, P S; Larson, D L; Sayre, L M et al. (1986) Opioid agonist and antagonist bivalent ligands. The relationship between spacer length and selectivity at multiple opioid receptors. J Med Chem 29:1855-61
Botros, S; Lipkowski, A W; Takemori, A E et al. (1986) Investigation of the structural requirements for the kappa-selective opioid receptor antagonist, 6 beta,6 beta'-[ethylenebis(oxyethyleneimino)]bis[17-(cyclopropylmethyl)- 4,5 alpha-epoxymorphinan-3,14-diol] (TENA). J Med Chem 29:874-6
Portoghese, P S; Ronsisvalle, G; Larson, D L et al. (1986) Synthesis and opioid antagonist potencies of naltrexamine bivalent ligands with conformationally restricted spacers. J Med Chem 29:1650-3