Biomolecules & Therapeutics

The Korean Society of Applied Pharmacology (한국응용약물학회)
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Sleep Promoting Effect of Luteolin in Mice via Adenosine A1 and A2A Receptors

  • Kim, Tae-Ho (College of Pharmacy, Ajou University) ;
  • Custodio, Raly James (Uimyoung Research Institute in Neuroscience, Sahmyook University) ;
  • Cheong, Jae Hoon (Uimyoung Research Institute in Neuroscience, Sahmyook University) ;
  • Kim, Hee Jin (Uimyoung Research Institute in Neuroscience, Sahmyook University) ;
  • Jung, Yi-Sook (College of Pharmacy, Ajou University)
  • Received : 2019.09.16
  • Accepted : 2019.10.04
  • Published : 2019.11.01
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Abstract

Luteolin, a widespread flavonoid, has been known to have neuroprotective activity against various neurologic diseases such as epilepsy, and Alzheimer's disease. However, little information is available regarding the hypnotic effect of luteolin. In this study, we evaluated the hypnotic effect of luteolin and its underlying mechanism. In pentobarbital-induced sleeping mice model, luteolin (1, and 3 mg/kg, p.o.) decreased sleep latency and increased the total sleep time. Through electroencephalogram (EEG) and electromyogram (EMG) recording, we demonstrated that luteolin increased non-rapid eye movement (NREM) sleep time and decreased wake time. To evaluate the underlying mechanism, we examined the effects of various pharmacological antagonists on the hypnotic effect of luteolin. The hypnotic effect of 3 mg/kg of luteolin was not affected by flumazenil, a GABAA receptorbenzodiazepine (GABAAR-BDZ) binding site antagonist, and bicuculine, a GABAAR-GABA binding site antagonist. On the other hand, the hypnotic effect of 3 mg/kg of luteolin was almost completely blocked by caffeine, an antagonist for both adenosine A1 and A2A receptor (A1R and A2AR), 8-Cyclopentyl-1,3-dipropylxanthine (DPCPX), an A1R antagonist, and SCH-58261, an A2AR antagonist. From the binding affinity assay, we have found that luteolin significantly binds to not only A1R but also A2AR with $IC_{50}$ of 1.19, $0.84{\mu}g/kg$, respectively. However, luteolin did not bind to either BDZ-receptor or GABAAR. From these results, it has been suggested that luteolin has hypnotic efficacy through A1R and A2AR binding.

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References

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