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cAMP-mediated decrease in K+ conductance evoked by serotonin and dopamine in the same neuron: a biochemical and

P Deterre, D Paupardin-Tritsch, J Bockaert

    Proceedings of the National Academy of Sciences of the United States of America
    |December 1, 1982
    PubMed
    Summary
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    Serotonin and dopamine activate independent receptors in snail neurons, both stimulating adenylate cyclase and decreasing potassium (K+) conductance via cyclic adenosine monophosphate (cAMP). Their interaction likely occurs downstream of cAMP.

    Area of Science:

    • Neuroscience
    • Cellular Biology
    • Molecular Pharmacology

    Background:

    • Serotonin and dopamine are key neurotransmitters modulating neuronal activity.
    • Cyclic adenosine monophosphate (cAMP) acts as a crucial intracellular second messenger.
    • Understanding neurotransmitter receptor signaling pathways is vital for neuroscience research.

    Purpose of the Study:

    • To investigate the signaling mechanisms of serotonin and dopamine in identified snail neurons.
    • To determine the role of adenylate cyclase and cAMP in mediating the effects of these neurotransmitters.
    • To elucidate the interaction between serotonin and dopamine signaling pathways.

    Main Methods:

    • Extracellular application of serotonin and dopamine.
    • Intracellular injection of cAMP.

    Related Experiment Videos

  • Single-cell microassay to measure adenylate cyclase activity.
  • Measurement of inward currents and K+ conductance changes.

    • Main Results:

    • Serotonin, dopamine, and cAMP all induced similar inward currents by decreasing K+ conductance.
    • Both serotonin and dopamine stimulated adenylate cyclase activity in responsive neurons.
    • While transmitter-induced currents did not sum, their effects on enzyme activity were additive.
    • Forskolin also stimulated adenylate cyclase and evoked an inward current.

    Conclusions:

    • Snail neurons possess distinct serotonin and dopamine receptors linked to adenylate cyclase.
    • Activation of these receptors leads to cAMP-mediated K+ channel modulation.
    • Neurotransmitter interaction likely occurs downstream of cAMP, affecting K+ channel gating.