4.7 Article

Sedative-hypnotic, anxiolytic and possible side effects of Salvia limbata C. A. Mey. Extracts and the effects of phenological stage and altitude on the rosmarinic acid content

Journal

JOURNAL OF ETHNOPHARMACOLOGY
Volume 282, Issue -, Pages -

Publisher

ELSEVIER IRELAND LTD
DOI: 10.1016/j.jep.2021.114630

Keywords

Anxiolytic; GABA-A; RP-HPLC; Rosmarinic acid; Salvia limbata; Sedative-hypnotic

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Salvia limbata has been traditionally used for treating central nervous disorders, and its pharmacological activities may be related to the presence of rosmarinic acid. This study evaluated the sedative-hypnotic effect, anxiolytic activity, possible side effects, and mechanism of action of S. limbata extracts. The results suggest modulation of the alpha 1-containing GABA-A receptors as a potential mechanism for its observed effects.
Ethnopharmacological relevance: Salvia limbata C. A. Mey. (Persian name: Maryam Goli-e-labeh dar) has been used for treating central nervous disorders such as insomnia, anxiety and depression in Persian traditional medicine. S. limbata is known for its pharmacological activities which could be at least in a part, upon the presence of rosmarinic acid (RA). However, the sedative-hypnotic effect, anxiolytic activity, possible side effects, and the mechanism of action of S. limbata extract has not yet been examined. Aim of the study: In the current study the sedative-hypnotic effect, anxiolytic activity, possible side effects, and the mechanism of action of S. limbata extracts were evaluated. Besides, the effects of altitude and phenological stage on the RA content of S. limbata were investigated. Materials and methods: Sedative-hypnotic and anxiolytic effects were evaluated through the pentobarbital induced loss of righting reflex test and open field test, respectively. Flumazenil was used to reveal the mechanism of action. Possible side effects were investigated in the passive avoidance and grip strength tests. Besides, the effects of altitude and phenological stage (vegetative, flowering, and seed setting) on the RA content of S. limbata were evaluated using reversed-phase high-performance liquid chromatography (RP-HPLC). Results: Following behavioral tests, sedative-hypnotic and anxiolytic effects were observed. Since the observed effects were reversed by flumazenil and no side effect on the memory and muscle strength was reported, modulation of the alpha 1-containing GABA-A receptors could be proposed as one of the involved mechanisms. According to the RP-HPLC analysis, harvesting S. limbata in the vegetative stage at the altitude of 2500 m led to the highest content of RA (8.67 +/- 0.13 mg/g dry matter). Among different extract of the plant samples collected in the vegetative stage at the altitude of 2500 m, the hydroalcoholic extract showed the highest rosmarinic acid content. Conclusion: The obtained results help to find the optimum situation to gain the highest content of RA as well as the pharmacological activity that could be economically important for the pharmaceutical industries.

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