title: [D-Ala2, (F5) Phe4]-dynorphin 1-13-NH2 (DAFPHEDYN): a potent analog of dynorphin 1-13.
abstract: Intracerebroventricular administration of the dynorphin analog, [D-Ala2,(F5)Phe4]-dynorphin 1-13-NH2 (DAFPHEDYN) in rats produced diuresis and profound analgesia. Both effects were antagonized by central administration of naltrexone or naloxone. Intravenous administration of 10, 25, and 50 mg/kg of DAFPHEDYN failed to induce diuresis. The increased potency of DAFPHEDYN was apparent from the failure of an equal dose of the parent compound (dynorphin 1-13) to produce diuresis and the failure of [D-Ala2]-dynorphin 1-13-NH2 to produce analgesia. Radioligand binding studies indicated the DAFPHEDYN retains the same degree of kappa selectivity as the parent compound (dynorphin 1-13) though a drop in affinity occurred. DAFPHEDYN may be of significant interest because it retains the essential pharmacology of the parent compound and exhibits marked in vivo potency.
mesh_terms: D000698:Analgesia; D000818:Animals; D001921:Brain / Q000378:metabolism; D002552:Cerebral Ventricles / Q000187:drug effects / Q000502:physiology; D004399:Dynorphins / Q000031:analogs & derivatives* / Q000494:pharmacology; D006168:Guinea Pigs; D009270:Naloxone / Q000494:pharmacology; D009294:Narcotics / Q000494:pharmacology*; D010446:Peptide Fragments / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D011957:Receptors, Opioid / Q000187:drug effects / Q000378:metabolism*; D017465:Receptors, Opioid, delta; D017473:Receptors, Opioid, kappa; D017450:Receptors, Opioid, mu; D013045:Species Specificity
chemical_list: D009294:Narcotics; D010446:Peptide Fragments; D011957:Receptors, Opioid; D017465:Receptors, Opioid, delta; D017473:Receptors, Opioid, kappa; D017450:Receptors, Opioid, mu; C054641:dynorphin amide (1-13), Ala(2)-(5-F-Phe)(4)-; D009270:Naloxone; D004399:Dynorphins