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Impairment in extinction of cued fear memory in syntenin-1 knockout mice.
Neurobiology of Learning and Memory 2018 March
Syntenin-1 is a PDZ domain-containing intracellular scaffold protein involved in exosome production, synapse formation, and synaptic plasticity. We tested whether syntenin-1 can regulate learning and memory through its effects on synaptic plasticity. Specifically, we investigated the role of syntenin-1 in contextual and cued fear conditioning and extinction of conditioned fear using syntenin-1 knockout (KO) mice. Genetic disruption of syntenin-1 had little effect on contextual and cued fear memory. However, syntenin-1 KO mice exhibited selective impairment in cued fear extinction retention. This extinction retention deficit in syntenin-1 KO mice was associated with reduced c-Fos-positive neurons in the basolateral amygdala (BLA) and infralimbic cortex (IL) after extinction training and increased c-Fos-positive neurons in the BLA after an extinction retention test. Our results suggest that syntenin-1 plays an important role in extinction of cued fear memory by modulating neuronal activity in the BLA and IL.
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