Flavonoid-Like Components of Peanut Stem and Leaf Extract Promote Sleep by Decreasing Neuronal Excitability

Area of Science:

• Neuroscience
• Pharmacology
• Traditional Chinese Medicine

Background:

• Peanut stem and leaf (PSL) is a traditional Chinese medicine used to improve sleep.
• The mechanism by which PSL enhances sleep quality is not well understood.
• Investigating the neurobiological effects of PSL is crucial for understanding its therapeutic potential.

Purpose of the Study:

• To determine if active compounds in PSL extract modulate neuronal excitability.
• To identify the specific compounds in PSL responsible for sleep-related effects.
• To elucidate the molecular targets underlying PSL's action on sleep.

Main Methods:

• Administration of aqueous PSL extract and isolated compounds (DMN, MIL) to BALB/c mice.
• Electrophysiological recordings of neuronal activity (sodium and potassium currents, action potential firing) in mouse cortical neurons.
• RNA sequencing and molecular docking simulations to identify molecular targets.

Main Results:

• Aqueous PSL extract significantly increased total sleep, slow wave sleep, and REM sleep duration.
• Two flavonoid-like compounds, 4',7-di-O-methylnaringenin (DMN) and 2'-O-methylisoliquiritigenin (MIL), mimicked the sleep-enhancing effects of PSL.
• DMN and MIL reduced neuronal excitability by inhibiting voltage-gated sodium and potassium currents and were predicted to bind to Nav 1.2 channels.

Conclusions:

• DMN and MIL are identified as key active ingredients in PSL responsible for its sleep-promoting effects.
• PSL enhances sleep quality by regulating neuronal excitability, specifically through modulation of voltage-gated sodium channels.
• These findings provide a mechanistic basis for the traditional use of PSL as a sleep aid.