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Related Experiment Videos

Hindered diffusion in excised membrane patches from retinal rod outer segments.

A L Zimmerman1, J W Karpen, D A Baylor

  • 1Department of Neurobiology, Stanford University School of Medicine, California 94305.

Biophysical Journal
|August 1, 1988
PubMed
Summary

Ionic current alters ion concentrations near retinal rod cell membranes, affecting channel studies. Methods are presented to correct for these effects, ensuring accurate analysis of ion channel gating kinetics.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biophysics

Background:

  • Excised inside-out membrane patches are crucial for studying cGMP-activated ion channels in retinal rod cells.
  • These channels are responsible for the electrical response to light in the retina.

Purpose of the Study:

  • To investigate how strong ionic current affects ion concentrations at the membrane surface in excised patches.
  • To develop methods for correcting experimental data to account for these ionic changes.

Main Methods:

  • Utilized excised inside-out membrane patches from retinal rod cells.
  • Applied voltage clamp techniques to measure ionic currents.
  • Analyzed ionic concentration changes near the membrane surface, particularly on the cytoplasmic side.

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Main Results:

  • Observed significant alterations in ionic concentration near the membrane due to strong ionic current.
  • Identified impaired diffusion adjacent to the cytoplasmic membrane surface, attributed to adhering intracellular material.
  • Quantified ionic changes consistent with the volume and reduced diffusion coefficient of intracellular material.

Conclusions:

  • Strong ionic currents in excised patches alter ion concentrations, impacting the driving force for current flow.
  • Developed correction methods to obtain accurate ion channel gating kinetics by removing contamination from altered driving forces.
  • Suggested that restricted diffusion in excised patches may be a general phenomenon affecting kinetic measurements in various cell types.