期刊
JOURNAL OF ETHNOPHARMACOLOGY
卷 142, 期 1, 页码 213-220出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.jep.2012.04.047
关键词
Ayurveda; Biflavonoid; GABA type A-benzodiazeine receptor; Hypnotic effects; Rhusflavone; Rhus parviflora
资金
- Mental Health Food Development Program from the Korea Food Research Institute [108056-03-3-HD110]
- Next-Generation Bio-Green 21 Program, Rural Development Administration, Republic of Korea [20110701-305-656-001-02-00]
- National Research Council of Science & Technology (NST), Republic of Korea [한국식품연구원] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ethnopharmacological relevance: Rhus parviflora is referred as 'Tintidikah' in traditional medicinal system of south Asia (Ayurveda). It is used in treatment of Vata vikara, a condition related to neurological complications as well as cure for stomach disorders. Materials and methods: Dried and powdered fruits of R. parviflora were extracted with 80% aqueous methanol (RPME). The concentrated extract was successively partitioned with distilled water (DW), ethyl acetate (EtOAc), and n-butanol (n-BuOH). All extracts, as well as isolated biflavonoids from R. parviflora, were evaluated for their affinity to the benzodiazepine binding site of GABA(A) receptor. The sedative-hypnotic effects of the fractions were evaluated by measuring sleep latency and sleep duration during pentobarbital-induced sleep in mice after oral administration of the extract fractions. Results: Oral administration of RPME (125 mg/kg, 250 mg/kg, 500 mg/kg, and 1000 mg/kg) produced a dose-dependent decrease in sleep latency and an increase in sleep duration in mice treated with pentobarbital. The methanol extract produced a hypnotic effect that was fully blocked by H-3-Ro 15-1788 flumazenil (FLU). Further, among the solvent fractions, the ethyl acetate fraction exhibited significant activity. Among the isolated compounds, biflavonoids mesuaferrone B (1), rhusflavone (3), and agathisflavone (4) competitively inhibited FLU binding with a K-i; of 0.280 mu M, 0.045 mu M, and 0.091 mu M, respectively. In addition, analysis of the sedative-hypnotic effects of rhusflavone, as well as those of the ethyl acetate, n-butanol, and distilled water fractions revealed that the modulation of both the ethyl acetate fraction and biflavonoid rhusflavone (3) are the most potent in inducing sleep. Conclusion: The presence of conjugated ketone and C6-C8 '' biflavonoid linkage in rhusflavone may be responsible for BZD-site of the GABA(A) leading to decrease in sleep latency and increase sleep duration. (C) 2012 Elsevier Ireland Ltd. All rights reserved.
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