Antidepressant-like effect of valproic acid-Possible involvement of PI3K/Akt/mTOR pathway.

Autor: Lima IVA; Department of Pharmacology, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil. Electronic address: bel.vieira@yahoo.com.br., Almeida-Santos AF; Department of Pharmacology, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil. Electronic address: anaflaviafarma@yahoo.com.br., Ferreira-Vieira TH; Department of Biochemistry and Immunology, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil. Electronic address: talitahfvieira@gmail.com., Aguiar DC; Department of Pharmacology, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil. Electronic address: danieleaguiar@outlook.com., Ribeiro FM; Department of Biochemistry and Immunology, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil. Electronic address: fmribeiro2013@gmail.com., Campos AC; Department of Pharmacology, Universidade de São Paulo, Ribeirão Preto, 14049-900, Brazil. Electronic address: allinecristinac@yahoo.com.br., de Oliveira ACP; Department of Pharmacology, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil. Electronic address: antoniooliveira@icb.ufmg.br.
Jazyk: angličtina
Zdroj: Behavioural brain research [Behav Brain Res] 2017 Jun 30; Vol. 329, pp. 166-171. Date of Electronic Publication: 2017 Apr 11.
DOI: 10.1016/j.bbr.2017.04.015
Abstrakt: Rationale: Few studies suggest that antidepressants exert their effects by activating some signaling pathways, including the phosphatidylinositol 3-kinase (PI3K). Moreover, valproic acid (VPA) activates the PI3K pathway. Thus, here we investigated the antidepressant-like effect of VPA and if its effect is related to PI3K/Akt/mTOR activation.
Methods: C57Bl/6 (WT) and PI3Kγ -/- mice received VPA injections (30, 100 or 300mg/kg, i.p.) and 30min after they were submitted to the forced swimming (FS), tail suspension (TS) and open field (OF) tests. Another group was pretreated with rapamycin (5mg/kg, i.p.) 150min before VPA administration. Akt phosphorylation levels were measured by Western blotting.
Results: In WT mice, VPA (30mg/kg) reduced the immobility time in both FS and TS tests. However, VPA (300mg/kg) increased the immobility time in FS test. All doses of VPA did not alter locomotor activity. In PI3Kγ -/- mice, none of the doses revealed antidepressant-like effect. However, in the OF test, the lower dose of VPA increased the travelled distance in comparison with vehicle group. An increase in Akt phosphorylation levels was observed in WT, but not in PI3Kγ -/- mice. Finally, the pretreatment of WT mice with rapamycin abolished the antidepressant-like effect of VPA (30mg/kg) in FS test.
Conclusion: These data suggest that the antidepressant-like effects of VPA might depend on PI3K and mTOR activation. Thus, more studies are necessary to investigate the mechanisms involved in the antidepressant-like effect induced by VPA in order to investigate novel therapeutic targets for the treatment of depression.
(Copyright © 2017 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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