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Related Experiment Videos

Gap junctions in excitable cells

P R Brink1, K Cronin, S V Ramanan

  • 1Department of Physiology and Biophysics, State University of New York, Stony Brook, 11794, USA.

Journal of Bioenergetics and Biomembranes
|August 1, 1996
PubMed
Summary
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Gap junction channels facilitate action potential propagation between cells. Their number and selective permeability, not voltage dependence, primarily limit signal conduction in most excitable cells.

Area of Science:

  • Cellular Biology
  • Neuroscience
  • Biophysics

Background:

  • Gap junction channels are crucial for intercellular communication.
  • They enable the passage of molecules between cells, influencing cellular processes.
  • These channels play a role in the conduction of action potentials.

Purpose of the Study:

  • To review the factors limiting action potential propagation through gap junctions.
  • To elucidate the role of gap junction properties in cellular communication and signal conduction.

Main Methods:

  • Literature review of studies on gap junction channels and action potential propagation.
  • Analysis of experimental data on channel gating, permeability, and voltage dependence.

Main Results:

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  • The total number of gap junction channels and their selective permeability are key limiting factors for action potential conduction.
  • Voltage dependence and inactivation kinetics are generally not rate-limiting under physiological conditions.
  • Specialized rectifying electrical synapses uniquely employ voltage dependence and rapid kinetics.

Conclusions:

  • Gap junction channel number and permeability are critical determinants of action potential propagation speed.
  • Understanding these factors is essential for comprehending intercellular signaling in excitable tissues.
  • Non-conductive roles of gap junction permeability may also influence cellular function and conduction velocity.