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Brain Res. 2014 Feb 14;1547:34-42. doi: 10.1016/j.brainres.2013.12.003. Epub 2013 Dec 10.

Anxiolytic-like effects of phytol: possible involvement of GABAergic transmission.

Author information

1
Laboratory of Research in Experimental Neurochemistry of Post-Graduation Program in Pharmaceutics Science, Federal University of Piauí, 64.049-550 Teresina, Piauí, Brazil.
2
Laboratory of Research in Experimental Neurochemistry of Post-Graduation Program in Pharmaceutics Science, Federal University of Piauí, 64.049-550 Teresina, Piauí, Brazil; Department of Pharmacy, Southern University Bangladesh, 22-Shahid Mirza Lane (E), Academic building-II, 739/A, Mehedibag Road, Mehedibag-4000, Chittagong, Bangladesh.
3
Department of Pharmaceutical Sciences, Federal University of Paraiba, 58.051-900, João Pessoa, Paraíba, Brazil.
4
Laboratory of Research in Experimental Neurochemistry of Post-Graduation Program in Pharmaceutics Science, Federal University of Piauí, 64.049-550 Teresina, Piauí, Brazil. Electronic address: rivelilson@pq.cnpq.br.

Abstract

Phytol, a branched chain unsaturated alcohol, is particularly interesting because it is an isolated compound from essential oils of different medicinal plants. The aim of this study was to evaluate the anxiolytic-like effects of phytol in animal models to clarify their possible action mechanism. After acute intraperitoneal treatment with phytol at doses of 25, 50 and 75 mg/kg behavioral models of open-field, elevated-plus-maze, rota-rod, light-dark, marble-burying and pentobarbital sleeping time tests were utilized. In open field test, phytol (25, 50 and 75 mg/kg) [p<0.01] increased the number of crossings and rearings. However, the number of groomings [p<0.01] was reduced. Likewise, the number of entries and the time spent in light space were increased [p<0.01] while the number of marble-burying was decreased [p<0.001], in elevated-plus-maze, light-dark and marble-burying tests, respectively. In motor activity test, phytol (75 mg/kg) impaired the rota-rod performance of mice [p<0.01]. In pentobarbital sleeping time test, phytol 75 mg/kg decreased for latency of sleeping and phytol (25, 50 and 75 mg/kg) increased the sleep time when compared to negative control [p<0.05]. All these effects were reversed by pre-treatment with flumazenil (2.5mg/kg, i.p.), similarly to those observed with diazepam (2mg/kg, i.p.; positive control) suggesting that the phytol presents mechanism of action by interaction with the GABAergic system. These findings suggest that acute administration of phytol exerts an anxiolytic-like effect on mice. Furthermore, suppose that phytol interacts with GABAA receptor, probably at the receptor subtypes that mediate benzodiazepines effects, to produce sedative and anxiolytic activities.

KEYWORDS:

Anxiolytic-like; Elevated-plus-maze; Light–dark; Marble-burying; Pentobarbital sleeping time; Phytol

PMID:
24333358
DOI:
10.1016/j.brainres.2013.12.003
[Indexed for MEDLINE]
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