title: Synthesis and opioid activity of partial retro-inverso analogs of dermorphin.
abstract: We studied the effect of partial retro-inverso modification of selected peptide bonds of dermorphin (H-Tyr-D-Ala-Phe-Gly-Tyr-Pro-Ser-NH2. The modifications concern two consecutive peptide bonds (Phe3-Cly4-Tyr5, I) or a single one (Gly4-Tyr5-, II or Phe3-Gly4, III). All pseudoheptapeptides showed low opioid activity in the in vitro and in vivo tests. Compound III has a biological potency comparable to that of morphine but only 2-5% of original dermorphin when tested in guinea pig ileum preparation and in mice tail-flick assay after intracerebro or subcutaneous administration.
mesh_terms: D000698:Analgesia; D000818:Animals; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D007202:Indicators and Reagents; D051379:Mice; D009294:Narcotics / Q000138:chemical synthesis*; D009842:Oligopeptides / Q000138:chemical synthesis* / Q000494:pharmacology; D018847:Opioid Peptides; D009904:Optical Rotation; D013329:Structure-Activity Relationship
chemical_list: D007202:Indicators and Reagents; D009294:Narcotics; D009842:Oligopeptides; D018847:Opioid Peptides; C030058:dermorphin