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Methyleugenol potentiates central amygdala GABAergic inhibition and reduces anxiety.
Journal of Pharmacology and Experimental Therapeutics 2018 November 3
Central amygdala (CeA) plays a critical role in the expression of emotional behaviors including pathological anxiety disorders. The present study demonstrated that the GABAergic inhibition in CeA was significantly increased by methyleugenol (ME), a natural constituent isolated from the essential oils of several plants. The electrophysiological recordings showed that ME increased both tonic and miniature inhibitory postsynaptic GABAergic currents (mIPSCs) in CeA slices, especially the tonic currents, while the miniature excitatory postsynaptic currents (mEPSCs) were not affected. In the fear-inducing anxiety animal model, both intraperitoneal injection or CeA-specific infusion of ME reduced the anxiety-like behaviors in mice likely by facilitating the activation of GABAARs. In summary, the current results revealed that GABAARs in the CeA can be a potential therapeutic target for the treatment of anxiety, and ME is capable of enhancing the GABAergic inhibition in CeA neurons for the inhibition of neuronal excitability.
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