Effect of xanthone from Kielmeyera coriacea stems on serotonergic neurons of the median raphe nucleus.

Autor: Sela VR; Department of Pharmacy and Pharmacology, State University of Maringá; Av Colombo 5790, 87020-900 Maringá, Paraná, Brazil., Hattanda I, Albrecht CM, De Almeida CB, Obici S, Cortez DA, Audi EA
Jazyk: angličtina
Zdroj: Phytomedicine : international journal of phytotherapy and phytopharmacology [Phytomedicine] 2010 Mar; Vol. 17 (3-4), pp. 274-8. Date of Electronic Publication: 2009 Aug 11.
DOI: 10.1016/j.phymed.2009.07.002
Abstrakt: Kielmeyera coriacea Mart. (Clusiaceae), known as "Pau Santo", is used to treat several tropical diseases. The hydroethanolic extract (HE) of Kielmeyera coriacea stems and its semi-pure dichloromethane constituent (DCM) produced an anti-immobility effect in rats submitted to the forced swimming test (FST), suggesting a antidepressant-like profile. This study evaluated the effect of intra-median raphe nucleus (MRN) microinjection of 1,3,7-trihydroxy-2-(3-methylbut-2-enyl)-xanthone, present in large quantity in the HE from Kielmeyera coriacea stems, on immobility behaviour in the FST in rats. The effects of xanthone were compared with intra-MRN microinjections of Way100635 (5-HT1A antagonist) or (+) 8-OH-DPAT (5-HT1A agonist). Locomotor activity in the open-field test (OFT) was evaluated as a complementary measure. Xanthone (0.3ng) or Way100635 (2.5microg) reduced, whereas (+) 8-OH-DPAT (5.0microg) increased immobility time in the FST. Way100635 (2.5 or 5.0microg) completely reversed the effects of (+) 8-OHDPAT (5.0microg), and potentiated the anti-immobility effect of the ineffective dose of xanthone (0.2ng) in the FST. The association of effective doses of (+) 8-OH-DPAT (5.0microg) and xanthone (0.3ng) annulled the effect of each compound on immobility time. These results suggest that xanthone acts as an antagonist at 5-HT1A autoreceptors in MRN and increases serotonin (5-HT) availability in projection regions, proving to be a prototype drug that may be useful in mood isorders such as depression, or indeed be a beneficial adjunctive treatment improving the efficacy and/or accelerating the effects of antidepressant drugs in patients with major depression.
(Copyright 2009 Elsevier GmbH. All rights reserved.)
Databáze: MEDLINE
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