title: Synthesis of stable and potent delta/mu opioid peptides: analogues of H-Tyr-c[D-Cys-Gly-Phe-D-Cys]-OH by ring-closing metathesis.
abstract: Ring-closing metathesis has emerged as a powerful tool in organic synthesis for generating cyclic structures via C-C double bond formation. Recently, it has been successfully used in peptide chemistry for obtaining cyclic molecules bridged through an olefin unit in place of the usual disulfide bond. Here, we describe this approach for obtaining cyclic olefin bridged analogues of H-Tyr-c[D-Cys-Gly-Phe-Cys]-OH. The synthesis of the new ligands was performed using the second generation Grubbs' catalyst. The resulting cis-8 (cDADAE) and trans-9 (tDADAE) were fully characterized and tested at delta, mu, and kappa opioid receptors. Also the linear precursor 13 (lDADAE) and the hydrogenated derivative 11 (rDADAE) also were tested. All the cyclic products containing a olefinic bond are slightly selective but highly active and potent for the delta and mu opioid receptors. Activity toward the kappa opioid receptors was absent or very low.
authors.affiliation: Università degli Studi G. D' Annunzio, Via dei Vestini 31, I-66013 Chieti, Italy.
authors.forename: Adriano
authors.initials: A
authors.lastname: Mollica
authors.forename: Giovanni
authors.initials: G
authors.lastname: Guardiani
authors.forename: Peg
authors.initials: P
authors.lastname: Davis
authors.forename: Shou-Wu
authors.initials: SW
authors.lastname: Ma
authors.forename: Frank
authors.initials: F
authors.lastname: Porreca
authors.forename: Josephine
authors.initials: J
authors.lastname: Lai
authors.forename: Luisa
authors.initials: L
authors.lastname: Mannina
authors.forename: Anatoli P
authors.initials: AP
authors.lastname: Sobolev
authors.forename: Victor J
authors.initials: VJ
authors.lastname: Hruby
mesh_terms: D000498:Allyl Compounds / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D000818:Animals; D004745:Enkephalins / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects / Q000294:innervation / Q000502:physiology; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects / Q000502:physiology; D009197:Myenteric Plexus / Q000502:physiology; D010456:Peptides, Cyclic / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D011869:Radioligand Assay; D017465:Receptors, Opioid, delta / Q000819:agonists* / Q000378:metabolism; D017473:Receptors, Opioid, kappa / Q000378:metabolism; D017450:Receptors, Opioid, mu / Q000819:agonists* / Q000378:metabolism; D013329:Structure-Activity Relationship; D014649:Vas Deferens / Q000187:drug effects / Q000502:physiology
chemical_list: D000498:Allyl Compounds; D004745:Enkephalins; D010456:Peptides, Cyclic; D017465:Receptors, Opioid, delta; D017473:Receptors, Opioid, kappa; D017450:Receptors, Opioid, mu