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• W4220936918 abstract "ABSTRACT Fear is an adaptive state that drives defensive behavioral responses to specific and imminent threats. The central nucleus of the amygdala (CeA) is a critical site of adaptations that are required for the acquisition and expression of fear, in part due to alterations in the activity of inputs to the CeA. Here, we characterize a novel GABAergic input to the CeA from the ventral periaqueductal gray area (vPAG) using fiber photometry and ex vivo whole-cell slice electrophysiology combined with optogenetics and pharmacology. GABA transmission from this ascending vPAG-CeA input was enhanced by bath application of serotonin via activation of serotonin type 2C (5HT 2C ) receptors. Results indicate that these receptors are presynaptic. Interestingly, we found that GABA release from the vPAG-CeA input is enhanced following fear learning via activation of 5HT 2C receptors and that this pathway is dynamically engaged during fear learning. Additionally, we characterized serotonin release in the CeA during fear learning and recall for the first time using fiber photometry coupled to a serotonin biosensor. Together, these findings describe a mechanism by which serotonin modulates GABA release from ascending vPAG GABA inputs to the CeA and characterize a role for this pathway in fear learning." @default.
• W4220936918 created "2022-04-03" @default.
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• W4220936918 date "2022-03-29" @default.
• W4220936918 modified "2023-10-17" @default.
• W4220936918 title "Serotonin Modulates an Inhibitory Input to the Central Amygdala from the Ventral Periaqueductal Gray" @default.
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• W4220936918 doi "https://doi.org/10.1101/2022.03.28.486055" @default.
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