Honokiol promotes non‐rapid eye movement sleep via the benzodiazepine site of the GABAA receptor in mice
- 5 September 2012
- journal article
- research article
- Published by Wiley in British Journal of Pharmacology
- Vol. 167 (3), 587-598
- https://doi.org/10.1111/j.1476-5381.2012.02010.x
Abstract
Decoctions of the Chinese herb houpu contain honokiol and are used to treat a variety of mental disorders, including depression. Depression commonly presents alongside sleep disorders and sleep disturbances, which appear to be a major risk factor for depression. Here, we have evaluated the somnogenic effect of honokiol and the mechanisms involved. Honokiol was administered i.p. at 20:00 h in mice. Flumazenil, an antagonist at the benzodiazepine site of the GABA(A) receptor, was administered i.p. 15 min before honokiol. The effects of honokiol were measured by EEG and electromyogram (EMG), c-Fos expression and in vitro electrophysiology. Honokiol (10 and 20 mg·kg⁻¹) significantly shortened the sleep latency to non-rapid eye movement (non-REM, NREM) sleep and increased the amount of NREM sleep. Honokiol increased the number of state transitions from wakefulness to NREM sleep and, subsequently, from NREM sleep to wakefulness. However, honokiol had no effect on either the amount of REM sleep or EEG power density of both NREM and REM sleep. Honokiol increased c-Fos expression in ventrolateral preoptic area (VLPO) neurons, as examined by immunostaining, and excited sleep-promoting neurons in the VLPO by whole-cell patch clamping in the brain slice. Pretreatment with flumazenil abolished the somnogenic effects and activation of the VLPO neurons by honokiol. Honokiol promoted NREM sleep by modulating the benzodiazepine site of the GABA(A) receptor, suggesting potential applications in the treatment of insomnia, especially for patients who experience difficulty in falling and staying asleep.This publication has 42 references indexed in Scilit:
- Guide to Receptors and Channels (GRAC), 5th editionBritish Journal of Pharmacology, 2011
- Magnolol, a major bioactive constituent of the bark of Magnolia officinalis, exerts antiepileptic effects via the GABA/benzodiazepine receptor complex in miceBritish Journal of Pharmacology, 2011
- Histamine regulates activities of neurons in the ventrolateral preoptic nucleusJournal Of Physiology-London, 2010
- Guidelines for reporting experiments involving animals: the ARRIVE guidelinesBritish Journal of Pharmacology, 2010
- Essential Role of Dopamine D2Receptor in the Maintenance of Wakefulness, But Not in Homeostatic Regulation of Sleep, in MiceJournal of Neuroscience, 2010
- Adenosine in the tuberomammillary nucleus inhibits the histaminergic system via A 1 receptors and promotes non-rapid eye movement sleepProceedings of the National Academy of Sciences of the United States of America, 2008
- Social anxiety and insomnia: the mediating role of depressive symptomsDepression and Anxiety, 2008
- Lipocalin-type prostaglandin D synthase produces prostaglandin D 2 involved in regulation of physiological sleepProceedings of the National Academy of Sciences of the United States of America, 2006
- Depression, sleep physiology, and antidepressant drugsDepression and Anxiety, 2001
- Benzodiazepine Side Effects: Role of Pharmacokinetics and PharmacodynamicsPharmacology, 1995