Effect of Valerian/Hop mixture on sleep-related behaviors in Drosophila melanogaster

Hyeon Son Choi, Bong Soo Ko, Hae Dun Kim, Ki Bae Hong, Hyung Joo Suh

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


The aim of this study was to investigate the sleep-promoting effect of a Valerian/Hops mixture in fruit flies. The HPLC analysis showed that Valerenic acid (1260.53 μg/g of extract) and Xanthohumol (Cascade: 827.49 μg/g, Hallertau: 763.60 μg/g, Saaz: 186.93 μg/g) were contained in Valerian and Hop, respectively. The sleep patterns of fruit flies on the Valerian/Hops were examined in both baseline and caffeine-treated conditions. Total activities of flies significantly decreased in 20 mg/mL Valerian (74%), 10 mg/mL Cascade (25%), and 5 mg/mL Hallertau (11%) during nighttime or daytime compared with the control. Valerian/Cascade mixture showed longer sleeping time (ca. 20%) than control group. This mixture-mediated effect was partly observed in caffeine-treated flies. Valerian/Cascade mixture upregulated mRNA expressions of gamma-aminobutyric acid (GABA) receptors and serotonin receptor, and GABA receptors were more strongly regulated than serotonin receptor. In competitive GABA receptor binding assay, Valerian/Cascade mixture extract showed a higher binding ability on GABA receptor than Valerenic acid or/and Xanthohumol which are estimated to be active compounds in the extract. This study demonstrates that a Valerian/Cascade mixture extract improves sleep-related behaviors, including sleeping time, by modulating GABAergic/serotonergic signaling.

Original languageEnglish
Pages (from-to)1101-1110
Number of pages10
JournalBiological and Pharmaceutical Bulletin
Issue number7
Publication statusPublished - 2017


  • Drosophila melanogaster
  • Hop
  • Insomnia
  • Sleep-promotion
  • Valerian

ASJC Scopus subject areas

  • Pharmacology
  • Pharmaceutical Science


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