Abstract
Purpose
Raw “Pinelliae Rhizoma” (RPR) is widely used in Chinese clinics to treat insomnia. This study investigated its underlying sedative and hypnotic mechanisms and main active components.
Methods
A locomotor activity test was used to evaluate the sedative effects of RPR at three dosages (0.2 g/mL, 0.4 g/mL, and 0.8 g/mL) in mice. Polysomnography was used to assess its ability to improve sleep. Ultra-performance liquid chromatography/time of flight/mass spectrometry (UPLC-TOF–MS) analysis was used to identify the potential active components of RPR.
Results
Mice in the RPR groups were less active than mice in the vehicle group; this difference was greatest in the 0.8 g/mL RPR group. Compared with the vehicle, 0.8 g/mL RPR increased the duration of rapid eye movement (REM) sleep in the dark phase. In addition, the duration of wakefulness in the 0.8 g/mL RPR group decreased with increasing durations of nonrapid eye movement (NREM) and REM sleep. Compared with diazepam, 0.8 g/mL RPR increased REM sleep duration in both the light and dark phases and increased the number of transitions both from NREM sleep to REM sleep and from REM sleep to wakefulness. A total of 33 RPR constituents, including 15 alkaloids, were identified.
Conclusion
The results preliminarily indicated that RPR exerts sedative and hypnotic effects in mice, mainly leading to improvements in REM sleep. These effects are possibly due to the alkaloid constituents of RPR.
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Data availability
The data analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We appreciate the support from the Department of Pharmacology, School of Basic Medical Sciences, Fudan University, Shanghai, China.
Funding
This work was supported by the Outstanding Youth Fund Project for Chinese Medicine of Zhejiang Province, China (Grant No. 2011zq014), and the 2019 incubation project of the First Affiliated Hospital of Wenzhou Medical University (Grant No. FHY2019041).
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Conceptualization: Zhengzhong Yuan; methodology: Zhengzhong Yuan; formal analysis and investigation: Sisi Lin, Haipeng Chen, and Chengrou Jiang; data curation: Sisi Lin, Haipeng Chen, and Hui Yang; writing—original draft preparation: Sisi Lin, Haipeng Chen, and Bo Nie; writing—review and editing: Bo Nie and Qinglai Wang; Funding acquisition: Zhengzhong Yuan and Sisi Lin; Resources: Zhengzhong Yuan and Qinglai Wang; and supervision: Zhengzhong Yuan and Qinglai Wang. The authors read and approved the final manuscript.
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The present study was approved by the experimental laboratory animal Ethics Committee of the Laboratory Animal Center at Whenzhou Medical University (wydw 2016–026) and was performed in accordance with the ethical standards provided in the 1964 Declaration of Helsinki and its later amendments.
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Lin, S., Chen, H., Nie, B. et al. Raw Pinelliae Rhizoma: examination of sedative and hypnotic effects in mice and chemical analysis. Sleep Breath 27, 1143–1153 (2023). https://doi.org/10.1007/s11325-022-02714-y
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DOI: https://doi.org/10.1007/s11325-022-02714-y