Mechanisms and safety of antidepressant-like effect of nutmeg in mice

Naohiro Iwata, Daisuke Kobayashi, Takehiro Kawashiri, Toshio Kubota, Kotomi Kawano, Yuki Yamamuro, Anna Miyagi, Yuya Deguchi, Takeshi Chijimatsu, Takao Shimazoe

研究成果: ジャーナルへの寄稿学術誌査読

抄録

Nutmeg, a dried seed kernel of a tall evergreen Myristicaceae tree, is widely used as a spice and herbal medicine and is known to have antidepressant-like effects. This study evaluates the mechanisms underlying this antidepressant-like effect and safety of nutmeg n-hexane extract (NNE) in mice. Tail suspension and open field tests showed that NNE (10 mg/kg, p.o.) significantly decreased the immobility time of mice without effecting their spontaneous locomotor activity. The reduction of immobility time of mice elicited by NNE was significantly inhibited by ketanserin (5-hydroxytryptamine (5-HT) 2A/2C receptor antagonist), ondansetron (5-HT 3 receptor antagonist), and yohimbine (α 2 receptor antagonist). WAY100635 (5-HT 1A receptor antagonist) tended to inhibit the effect of NNE but without significance. Testing according to the Organisation for Economic Co-operation and Development Guidelines, no mice died due to administrated NNE (2,000 mg/kg, p.o.), and behavioral and weight changes were not seen in the acute toxicity test. In the Ames test, no increase in the number of revertant colonies for each bacterial strain test strains TA98 and TA100 by nutmeg powder was observed either with or without metabolic activity by S9 mix. These results suggest that NNE shows an antidepressant-like effect involving various serotonergic and noradrenergic nervous systems and maybe a highly safe natural preparation.

本文言語英語
ジャーナルBiological & pharmaceutical bulletin
DOI
出版ステータス印刷前の電子出版 - 3月 19 2022

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