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Related Experiment Videos

Decrease of gap junction permeability induced by dopamine and cyclic adenosine 3':5'-monophosphate in horizontal

M Piccolino, J Neyton, H M Gerschenfeld

    The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
    |October 1, 1984
    PubMed
    Summary

    Dopamine narrows H1 horizontal cell receptive fields in turtle retina by increasing gap junction resistance. This action, mediated by D1 receptors and cyclic AMP, reduces signal spread in the retinal network.

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    Area of Science:

    • Neuroscience
    • Retinal Physiology
    • Cellular Biology

    Background:

    • H1 horizontal cells in the turtle retina are crucial for visual processing.
    • These cells feature axon terminals extensively coupled by gap junctions, enabling electrical communication.

    Purpose of the Study:

    • To investigate the effects of dopamine on the electrical coupling and receptive field properties of H1 horizontal cell axon terminals.
    • To elucidate the underlying mechanisms, including receptor involvement and second messenger pathways.

    Main Methods:

    • Electrophysiological recordings to measure coupling resistance and receptive field profiles.
    • Application of dopamine and cyclic AMP modulating agents (forskolin, IBMX).
    • Dye diffusion studies (Lucifer Yellow) to assess network connectivity.

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    Main Results:

    • Dopamine (10 nM–10 µM) narrowed H1 axon terminal receptive fields and increased coupling resistance.
    • Dopamine decreased Lucifer Yellow diffusion, indicating reduced gap junction permeability.
    • D1 receptor activation and increased intracellular cyclic AMP mimicked dopamine's effects.

    Conclusions:

    • Dopamine decreases gap junction permeability between H1 horizontal cell axon terminals in the turtle retina.
    • This modulation of retinal network connectivity likely involves cyclic AMP as a second messenger.