title: A selective and extremely potent antagonist of the neurokinin-1 receptor.
abstract: Sendide [Tyr6,D-Phe7,D-His9]-substance P(6-11) has been examined by measurements of ligand binding to crude membrane fractions and by functional tests on the spinally mediated behavioral response. Sendide potently displaced [3H]-labeled substance P (SP) binding to mouse spinal cord membranes in a competitive manner. In vivo, sendide, intrathecally co-injected with SP, competitively antagonized SP-induced scratching, biting and licking. The behaviors elicited by physalaemin, septide and [Sar9, Met(O2)11]-SP were also reduced by co-administration of sendide. Large doses of sendide were needed to reduce the action of neurokinin A, D-septide, neurokinin B and eledoisin. The in vitro and in vivo pharmacological profile of sendide demonstrated that it is a selective and extremely potent antagonist of the neurokinin-1 receptor.
mesh_terms: D000595:Amino Acid Sequence; D000700:Analgesics / Q000008:administration & dosage / Q000494:pharmacology*; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D001667:Binding, Competitive; D002462:Cell Membrane / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D007278:Injections, Spinal; D007700:Kinetics; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000008:administration & dosage / Q000494:pharmacology*; D011761:Pyrrolidonecarboxylic Acid / Q000031:analogs & derivatives; D018041:Receptors, Neurokinin-2; D017981:Receptors, Neurotransmitter / Q000037:antagonists & inhibitors*; D013116:Spinal Cord / Q000378:metabolism*; D013329:Structure-Activity Relationship; D013373:Substance P / Q000008:administration & dosage / Q000378:metabolism* / Q000494:pharmacology*; D015320:Tachykinins / Q000494:pharmacology*
chemical_list: D000700:Analgesics; D010446:Peptide Fragments; D018041:Receptors, Neurokinin-2; D017981:Receptors, Neurotransmitter; D015320:Tachykinins; D013373:Substance P; C032292:substance P (6-11); D011761:Pyrrolidonecarboxylic Acid