title: Synthesis and biological activity of NK-2 selective tachykinin antagonists containing D-tryptophan.
abstract: By introducing D-Trp in position 6 and 8 along with pyroglutamic acid (Pyr) in position 4 or Nle in position 10 of NKA(4-10) we have obtained selective although weak NK-2 tachykinin receptor antagonists. Similar substitutions, previously reported on the sequence of SP, gave rise to nonselective antagonists presumably for the limited selectivity of the agonist used as template. Further modifications like the addition of a third D-Trp in position 9 gave rise to more potent but less selective antagonists, thus showing that each amino acid substitution can dramatically affect selectivity.
authors.affiliation: Chemistry Department, A. Menarini Pharmaceuticals, Firenze, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Rovero
authors.forename: V
authors.initials: V
authors.lastname: Pestellini
authors.forename: R
authors.initials: R
authors.lastname: Patacchini
authors.forename: S
authors.initials: S
authors.lastname: Giuliani
authors.forename: C A
authors.initials: CA
authors.lastname: Maggi
authors.forename: A
authors.initials: A
authors.lastname: Meli
authors.forename: A
authors.initials: A
authors.lastname: Giachetti
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008969:Molecular Sequence Data; D009130:Muscle, Smooth / Q000187:drug effects; D009131:Muscle, Smooth, Vascular / Q000187:drug effects; D015288:Neurokinin A / Q000138:chemical synthesis* / Q000494:pharmacology; D010446:Peptide Fragments / Q000138:chemical synthesis* / Q000494:pharmacology; D051381:Rats; D017981:Receptors, Neurotransmitter / Q000187:drug effects*; D018039:Receptors, Tachykinin; D015320:Tachykinins / Q000037:antagonists & inhibitors*; D014364:Tryptophan
chemical_list: D010446:Peptide Fragments; D017981:Receptors, Neurotransmitter; D018039:Receptors, Tachykinin; D015320:Tachykinins; D015288:Neurokinin A; D014364:Tryptophan; C056408:neurokinin A(4-10)