title: Quercetin as the active principle of Hypericum hircinum exerts a selective inhibitory activity against MAO-A: extraction, biological analysis, and computational study.
abstract: The methanol extract from Hypericum hircinum leaves exhibited in vitro inhibition of monoamine oxidases (MAO). Bioassay-guided fractionation led to the isolation of quercetin and five compounds identified for the first time from H. hircinum. Quercetin was the only compound with a selective inhibitory activity against MAO-A, with an IC50 value of 0.010 microM. To explain MAO selective inhibition at the molecular level, a computational study was carried out by conformational search and docking techniques using recently determined crystallographic models of both enzymatic isoforms. An in vivo study in mice was carried out using the forced swimming test in order to elucidate the behavioral effects of quercetin.
authors.affiliation: Dipartimento di Studi di Chimica e Tecnologia delle Sostanze Biologicamente Attive, Università degli Studi di Roma La Sapienza, P.le A. Moro 5, 00185 Rome, Italy.
authors.forename: Franco
authors.initials: F
authors.lastname: Chimenti
authors.forename: Filippo
authors.initials: F
authors.lastname: Cottiglia
authors.forename: Leonardo
authors.initials: L
authors.lastname: Bonsignore
authors.forename: Laura
authors.initials: L
authors.lastname: Casu
authors.forename: Mariano
authors.initials: M
authors.lastname: Casu
authors.forename: Costantino
authors.initials: C
authors.lastname: Floris
authors.forename: Daniela
authors.initials: D
authors.lastname: Secci
authors.forename: Adriana
authors.initials: A
authors.lastname: Bolasco
authors.forename: Paola
authors.initials: P
authors.lastname: Chimenti
authors.forename: Arianna
authors.initials: A
authors.lastname: Granese
authors.forename: Olivia
authors.initials: O
authors.lastname: Befani
authors.forename: Paola
authors.initials: P
authors.lastname: Turini
authors.forename: Stefano
authors.initials: S
authors.lastname: Alcaro
authors.forename: Francesco
authors.initials: F
authors.lastname: Ortuso
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Trombetta
authors.forename: Alberto
authors.initials: A
authors.lastname: Loizzo
authors.forename: Irene
authors.initials: I
authors.lastname: Guarino
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D020902:Hypericum / Q000737:chemistry*; D020128:Inhibitory Concentration 50; D051379:Mice; D008968:Molecular Conformation; D015394:Molecular Structure; D008996:Monoamine Oxidase Inhibitors / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D009043:Motor Activity / Q000187:drug effects; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D011794:Quercetin / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D013550:Swimming
chemical_list: D008996:Monoamine Oxidase Inhibitors; D011794:Quercetin