title: Measurement of dynorphins with 3H-etorphine and canine limbic system receptors.
abstract: A canine limbic system preparation was used as the source of opioid peptide receptors to screen biologic extracts for the presence of opioid receptoractive peptides following their gradient RP-HPLC separation. Eight synthetic dynorphin peptides were studied for their ability to displace the commonly-used ligand 3H-etorphine from the canine limbic system P2 preparation. The peptides studied included the dynorphins 1-7, 1-8, 1-9, 1-10, 1-12, 1-13, 1-17, and dynorphin B. Two different types of opioid peptide molecules were utilized for the determination of the level of non-specific binding. In one study, methionine enkephalin, and in the second study each one of the eight corresponding dynorphins, was used for determination of non-specific binding. The experimental data indicated that 3H-etorphine bound to the canine limbic system P2 receptors, and that those dynorphins displaced effectively the 3H-etorphine from those receptors.
mesh_terms: D000818:Animals; D004285:Dogs; D004399:Dynorphins / Q000032:analysis*; D005048:Etorphine; D008032:Limbic System / Q000502:physiology*; D009019:Morphinans; D011863:Radioimmunoassay; D011957:Receptors, Opioid
chemical_list: D009019:Morphinans; D011957:Receptors, Opioid; D005048:Etorphine; D004399:Dynorphins