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Related Experiment Videos

Horizontal cell gap junctions: single-channel conductance and modulation by dopamine.

D G McMahon1, A G Knapp, J E Dowling

  • 1Department of Cellular and Developmental Biology, Harvard University, Cambridge, MA 02138.

Proceedings of the National Academy of Sciences of the United States of America
|October 1, 1989
PubMed
Summary

Dopamine modulates inhibitory signal transmission in the retina by reducing the open probability of gap junction channels. This neurotransmitter affects channel gating, specifically decreasing their open duration.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Vision Science

Background:

  • Horizontal cells form electrically coupled networks in the outer retina.
  • These networks are crucial for transmitting inhibitory signals.
  • Dopamine is a neurotransmitter that modulates horizontal cell coupling in teleosts.

Purpose of the Study:

  • To investigate the effects of dopamine on the conductance and gating properties of cell-to-cell channels (gap junctions) in teleost horizontal cells.
  • To understand how dopamine influences electrical synaptic transmission.

Main Methods:

  • Voltage-clamped recordings from pairs of teleost horizontal cells.
  • Variance analysis of junctional current noise to assess channel open probability.
  • Direct observation of unitary junctional gating events.

Related Experiment Videos

  • Pharmacological manipulation using dopamine and octanol.

    • Main Results:

    • Dopamine significantly reduced the open probability of gap junction channels from 0.75 to 0.14.
    • Unitary conductance of gap junction channels was measured (50-60 pS) and found to be unaffected by dopamine or octanol.
    • Dopamine's effect is primarily on channel gating, not conductance.

    Conclusions:

    • Dopamine reduces the open probability of retinal gap junction channels.
    • This modulation is achieved by decreasing the open duration of the channels.
    • Dopamine plays a key role in regulating inhibitory signal transmission in the visual system.