Sleep-promoting effects of a GABA/5-HTP mixture: Behavioral changes and neuromodulation in an invertebrate model
- Authors
- Hong, Ki-Bae; Park, Yooheon; Suh, Hyung Joo
- Issue Date
- 1-Apr-2016
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Insomnia; Sleep; gamma-Aminobutyric acid; 5-Hydroxytryptophan; Drosophila melanogaster
- Citation
- LIFE SCIENCES, v.150, pp.42 - 49
- Indexed
- SCIE
SCOPUS
- Journal Title
- LIFE SCIENCES
- Volume
- 150
- Start Page
- 42
- End Page
- 49
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/88949
- DOI
- 10.1016/j.lfs.2016.02.086
- ISSN
- 0024-3205
- Abstract
- Aims: This study was to investigate the sleep promoting effects of combined gamma-aminobutyric acid (GABA) and 5-hydroxytryptophan (5-HTP), by examining neuronal processes governing mRNA level alterations, as well as assessing neuromodulator concentrations, in a fruit fly model. Main methods: Behavioral assays were applied to investigate subjective nighttime activity, sleep episodes, and total duration of subjective nighttime sleep of two amino acids and GABA/5-HTP mixture with caffeine treated flies. Also, real-time PCR and HPLC analysis were applied to analyze the signaling pathway. Key findings: Subjective nighttime activity and sleep patterns of individual flies significantly decreased with 1% GABA treatment in conjunction with 0.1% 5-HTP treatment (p < 0.001). Furthermore, GABA/5-HTP mixture resulted in significant differences between groups related to sleep patterns (40%, p < 0.017) and significantly induced subjective nighttime sleep in the awake model (p < 0.003). These results related to transcript levels of the GABA(B) receptor (GABA(B)-R1) and serotonin receptor (5-HT1A), compared to the control group. In addition, GABA/5-HTP mixture significantly increased GABA levels 1 h and 12 h following treatment (2.1 fold and 1.2 fold higher than the control, respectively) and also increased 5-HTP levels (0 h: 1.01 mu g/protein, 12 h: 3.45 mu g/protein). Significance: In this regard, we successfully demonstrated that using a GABA/5-HTP mixture modulates subjective nighttime activity, sleep episodes, and total duration of subjective nighttime sleep to a greater extent than single administration of each amino acid, and that this modulation occurs via GABAergic and serotonergic signaling. (C) 2016 Elsevier Inc. All rights reserved.
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Collections - College of Health Sciences > School of Biosystems and Biomedical Sciences > 1. Journal Articles
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