Critical role of protein kinase G in the long-term balance between defensive and appetitive behaviors induced by aversive stimuli in Aplysia.

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  • Additional Information
    • Source:
      Publisher: Elsevier/North-Holland Biomedical Press Country of Publication: Netherlands NLM ID: 8004872 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1872-7549 (Electronic) Linking ISSN: 01664328 NLM ISO Abbreviation: Behav Brain Res Subsets: MEDLINE
    • Publication Information:
      Original Publication: Amsterdam, Elsevier/North-Holland Biomedical Press.
    • Subject Terms:
      Appetitive Behavior/*physiology ; Behavior, Animal/*physiology ; Cyclic GMP/*metabolism ; Cyclic GMP-Dependent Protein Kinases/*metabolism ; Feeding Behavior/*physiology ; Nitric Oxide/*metabolism ; Sensory Receptor Cells/*metabolism; Animals ; Aplysia ; Appetitive Behavior/drug effects ; Behavior, Animal/drug effects ; Carbazoles/pharmacology ; Feeding Behavior/drug effects ; Learning/physiology ; Protein Kinase Inhibitors/pharmacology ; Sensory Receptor Cells/drug effects
    • Abstract:
      This study investigated the signaling cascades involved in the long-term storage of the balance between defensive and appetitive behaviors observed when the mollusk Aplysia is exposed to aversive experience. In Aplysia, repeated trials of aversive stimuli induce concurrent sensitization of defensive withdrawal reflexes and suppression of feeding for at least 24 h. This long-term storage of the balance between withdrawal reflexes and feeding is sustained, at least in part, by increased excitability of the tail sensory neurons (SNs) controlling the withdrawal reflexes, and by decreased excitability of feeding decision-making neuron B51. Nitric oxide (NO) is required for the induction of both long-term sensitization and feeding suppression. At the cellular level, NO is also required for long-term decreased B51 excitability but not for long-term increased SN excitability. Here, we characterized the signaling cascade downstream of NO contributing to the long-term storage of the balance between withdrawal reflexes and feeding. We found protein kinase G (PKG) necessary for both long-term sensitization and feeding suppression, indicating that a NO-PKG cascade governs the long-term storage of the balance between defensive and appetitive responses in Aplysia. The role of PKG on feeding suppression was paralleled at the cellular level where a cGMP-PKG pathway was required for long-term decreased B51 excitability. In the defensive circuit, the cGMP-PKG pathway was not necessary for long-term increased SN excitability, suggesting that other cellular correlates of long-term sensitization might depend on the GMP-PKG cascade to sustain the behavioral change.
      Competing Interests: Declaration of Competing Interest The authors have no actual or potential conflicts of interest.
      (Copyright © 2020 Elsevier B.V. All rights reserved.)
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    • Grant Information:
      SC3 GM111188 United States GM NIGMS NIH HHS
    • Contributed Indexing:
      Keywords: Excitability; Feeding suppression; Memory; Sensitization
    • Accession Number:
      0 (Carbazoles)
      0 (Protein Kinase Inhibitors)
      126643-37-6 (KT 5823)
      31C4KY9ESH (Nitric Oxide)
      EC 2.7.11.12 (Cyclic GMP-Dependent Protein Kinases)
      H2D2X058MU (Cyclic GMP)
    • Publication Date:
      Date Created: 20200126 Date Completed: 20210525 Latest Revision: 20210525
    • Publication Date:
      20231215
    • Accession Number:
      PMC7062407
    • Accession Number:
      10.1016/j.bbr.2020.112504
    • Accession Number:
      31981653