title: Efficacy of an Hypericum perforatum (St. John's wort) extract in preventing and reverting a condition of escape deficit in rats.
abstract: The treatment of unselected depressed patients with an hydro-alcoholic extract of Hypericum perforatum has been reported to have an efficacy similar to that of classical antidepressants. In the present report, the effects of H. perforatum were studied on three animal models of depression: (i) an acute form of escape deficit (ED) induced by an unavoidable stress; (ii) a chronic model of ED, which can be maintained by the administration of mild stressors on alternate days; (iii) a model of anhedonia based on the finding that repeated stressors prevent the development of an appetitive behavior induced by vanilla sugar in satiated rats fed ad libitum. H. perforatum acutely protected animals from the sequelae of unavoidable stress; such an effect was partially prevented by the administration of SCH 23390 or (-)-pindolol. Moreover, H. perforatum reverted the ED maintained by repeated stressors and preserved the animal's capacity to learn to operate for earning a positive reinforcer. It was concluded that H. perforatum contains some active principle(s) endowed with antidepressant activity.
authors.affiliation: Institute of Clinica delle Malattie Nervose e Mentali, Pharmacology Unit, Siena, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Gambarana
authors.forename: O
authors.initials: O
authors.lastname: Ghiglieri
authors.forename: P
authors.initials: P
authors.lastname: Tolu
authors.forename: M G
authors.initials: MG
authors.lastname: De Montis
authors.forename: D
authors.initials: D
authors.lastname: Giachetti
authors.forename: E
authors.initials: E
authors.lastname: Bombardelli
authors.forename: A
authors.initials: A
authors.lastname: Tagliamonte
mesh_terms: D000208:Acute Disease; D000818:Animals; D001066:Appetite / Q000187:drug effects* / Q000502:physiology; D001552:Benzazepines / Q000494:pharmacology; D002908:Chronic Disease; D004195:Disease Models, Animal; D004597:Electroshock; D020448:Ericales; D004924:Escape Reaction / Q000187:drug effects* / Q000502:physiology; D005473:Fluoxetine / Q000494:pharmacology; D007099:Imipramine / Q000494:pharmacology; D008297:Male; D009043:Motor Activity / Q000187:drug effects; D010146:Pain / Q000503:physiopathology / Q000523:psychology*; D010936:Plant Extracts / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013315:Stress, Psychological / Q000503:physiopathology / Q000523:psychology*
chemical_list: D001552:Benzazepines; D010936:Plant Extracts; D005473:Fluoxetine; D007099:Imipramine