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  • Title: 3,4,5-Trimethoxycinnamic acid (TMCA), one of the constituents of Polygalae Radix enhances pentobarbital-induced sleeping behaviors via GABAAergic systems in mice.
    Author: Lee CI, Han JY, Hong JT, Oh KW.
    Journal: Arch Pharm Res; 2013 Oct; 36(10):1244-51. PubMed ID: 23852644.
    Abstract:
    These experiments were performed to investigate whether 3,4,5-trimethoxycinnamic acid (TMCA), one of the constituents derived from Polygalae Radix, enhances pentobarbital-induced sleeping behaviors, and to alter sleep architecture through the γ-aminobutyric acid (GABA)ergic systems in mice. TMCA decreased the locomotor activity. TMCA prolonged total sleep time, and reduced sleep latency induced by pentobarbital, similar to muscimol, a GABAA agonist. From the electrocencephalogram recording for 6 h after TMCA administration, the number of sleep/wake cycles were reduced by TMCA. TMCA also increased the total sleep time and non-rapid eye movement (NREM) sleep. In addition, TMCA increased Cl(-) influx in primary cultured cerebellar granule cells of mice. TMCA increased the activation of glutamic acid decarboxylase (GAD) and the expressions of γ-subunit of GABAA receptors in the cerebellar granule cells. However, α- and β-subunits proteins of GABAA receptors were not increased. Therefore, TMCA would increase pentobarbital induced-sleep and NREM sleep in mice. These results indicate that TMCA may enhance sleep and alter sleep architecture through GABAAergic systyems.
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