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Behav Brain Res. 2016 Sep 1;310:36-41. doi: 10.1016/j.bbr.2016.04.049. Epub 2016 May 2.

Sleep-promoting effects of the GABA/5-HTP mixture in vertebrate models.

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Department of Public Health Sciences, Korea University, Seoul 136-713, Republic of Korea.
Dongguk University Research Institute of Biotechnology, Goyang 10326, Republic of Korea.
Department of Public Health Sciences, Korea University, Seoul 136-713, Republic of Korea. Electronic address:


The aim of this study was to investigate the sleep-promoting effect of combined γ-aminobutyric acid (GABA) and 5-hydroxytryptophan (5-HTP) on sleep quality and quantity in vertebrate models. Pentobarbital-induced sleep test and electroencephalogram (EEG) analysis were applied to investigate sleep latency, duration, total sleeping time and sleep quality of two amino acids and GABA/5-HTP mixture. In addition, real-time PCR and HPLC analysis were applied to analyze the signaling pathway. The GABA/5-HTP mixture significantly regulated the sleep latency, duration (p<0.005), and also increased the sleep quality than single administration of the amino acids (p<0.000). Long-term administration increased the transcript levels of GABAA receptor (1.37-fold, p<0.000) and also increased the GABA content compared with the control group 12h after administration (1.43-fold, p<0.000). Our available evidence suggests that the GABA/5-HTP mixture modulates both GABAergic and serotonergic signaling. Moreover, the sleep architecture can be controlled by the regulation of GABAA receptor and GABA content with 5-HTP.


5-Hydroxytryptophan; Electroencephalogram; Pentobarbital; Sleep; Vertebrate; γ-Aminobutyric acid

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