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• W2040442376 abstract "α2 adrenergic agonists such as dexmedetomidine generally suppress noradrenergic transmission and have sedative, analgesic, and antihypertensive properties. Considering the importance of the neurotransmitter norepinephrine in forming memories for fearful events, we have investigated the acute and chronic effects of dexmedetomidine on discrete cue and contextual fear conditioning in mice. When administered before training, dexmedetomidine (10–20 μg/kg, i.p.) selectively suppressed discrete cue fear conditioning without affecting contextual memory. This behavioral change was associated with a decrease in memory retrieval-induced expression of c-Fos and P-CREB in the lateral, basolateral, and central nuclei of the amygdala. Dexmedetomidine's action on discrete cue memory did not occur in α2A adrenoceptor knockout (KO) mice. When dexmedetomidine was administered after training, it suppressed contextual memory, an effect that did not occur in α2A adrenoceptor KO mice. We conclude that dexmedetomidine, acting at α2A adrenoceptors, must be present during the encoding process to decrease discrete cue fear memory; however, its ability to suppress contextual memory is likely the result of blocking the consolidation process. The ability of α2 agonists to suppress fear memory may be a valuable property clinically in order to suppress the formation of memories during stressful situations." @default.
• W2040442376 created "2016-06-24" @default.
• W2040442376 creator A5019838494 @default.
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• W2040442376 date "2003-10-29" @default.
• W2040442376 modified "2023-09-27" @default.
• W2040442376 title "Activation of α2 Adrenergic Receptors Suppresses Fear Conditioning: Expression of c-Fos and Phosphorylated CREB in Mouse Amygdala" @default.
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• W2040442376 doi "https://doi.org/10.1038/sj.npp.1300324" @default.
• W2040442376 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/14583739" @default.
• W2040442376 hasPublicationYear "2003" @default.
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