title: Suppression of food intake by a complement C3a agonist [Trp5]-oryzatensin(5-9).
abstract: [Trp5]-oryzatensin(5-9) (WPLPR), an agonist peptide for complement C3a receptor, has been designed based on the C-terminal region of ileum-contracting peptide oryzatensin derived from rice protein. We previously reported that WPLPR has anti-analgesic and anti-amnesic activities after central or oral administration. In this study, we found a novel function of WPLPR on food intake. WPLPR suppressed food intake after intracerebroventricular or intraperitoneal (i.p.) administration at a dose of 3-30 nmol/mouse or 30-300 mg/kg, respectively, in fasted mice. Orally administered WPLPR at a dose of 300 mg/kg also decreased food intake. WPLPR decreased gastric emptying after i.p. injection at a dose of 300 mg/kg. The anorexigenic activity of WPLPR was blocked by cyclooxygenase inhibitor or antagonist for prostaglandin (PG) E receptor EP4 subtype. These results suggest that WPLPR decreases food intake through PGE2 production followed by EP4 receptor activation.
authors.affiliation: Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho Uji, Kyoto 611-0011, Japan.
authors.forename: Kousaku
authors.initials: K
authors.lastname: Ohinata
authors.forename: Kentaro
authors.initials: K
authors.lastname: Suetsugu
authors.forename: Yoko
authors.initials: Y
authors.lastname: Fujiwara
authors.forename: Masaaki
authors.initials: M
authors.lastname: Yoshikawa
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D015926:Complement C3a / Q000819:agonists*; D004435:Eating / Q000187:drug effects*; D005746:Gastric Emptying / Q000187:drug effects; D007274:Injections, Intraperitoneal; D007276:Injections, Intraventricular; D008297:Male; D051379:Mice; D009842:Oligopeptides / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology*; D018078:Receptors, Prostaglandin E / Q000187:drug effects; D058309:Receptors, Prostaglandin E, EP4 Subtype
chemical_list: D009842:Oligopeptides; C545651:Ptger4 protein, mouse; D018078:Receptors, Prostaglandin E; D058309:Receptors, Prostaglandin E, EP4 Subtype; C091249:oryzatensin; D015926:Complement C3a