PKA and PKC are required for long-term but not short-term in vivo operant memory in Aplysia |
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Authors: | Michel Maximilian Green Charity L Lyons Lisa C |
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Institution: | Program in Neuroscience, Department of Biological Science, Florida State University, Tallahassee, Florida 32306-4295, USA. |
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Abstract: | We investigated the involvement of PKA and PKC signaling in a negatively reinforced operant learning paradigm in Aplysia, learning that food is inedible (LFI). In vivo injection of PKA or PKC inhibitors blocked long-term LFI memory formation. Moreover, a persistent phase of PKA activity, although not PKC activity, was necessary for long-term memory. Surprisingly, neither PKA nor PKC activity was required for associative short-term LFI memory. Additionally, PKA and PKC were not required for the retrieval of short- or long-term memory (STM and LTM, respectively). These studies have identified key differences between the mechanisms underlying nonassociative sensitization, operant reward learning, and LFI memory in Aplysia. |
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