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Related Experiment Videos

CFTR displays voltage dependence and two gating modes during stimulation

H Fischer1, T E Machen

  • 1Department of Molecular and Cell Biology, University of California at Berkeley 94720.

The Journal of General Physiology
|September 1, 1994
PubMed
Summary

Forskolin stimulation enhances cystic fibrosis transmembrane conductance regulator (CFTR) channel activity by reducing long closed states and enabling a high open probability mode. This dual mechanism increases CFTR function through cAMP-dependent regulation.

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Area of Science:

  • Ion channel biophysics
  • Molecular physiology

Background:

  • The cystic fibrosis transmembrane conductance regulator (CFTR) is a crucial ion channel.
  • Understanding CFTR regulation is vital for cystic fibrosis research.

Purpose of the Study:

  • To investigate the gating mechanisms of CFTR during cAMP-dependent stimulation.
  • To elucidate how forskolin affects CFTR channel activity.

Main Methods:

  • Patch-clamp technique combined with current noise analysis.
  • Utilized 3T3 fibroblast cells expressing CFTR.
  • Stimulated cells with forskolin in cell-attached mode.

Main Results:

  • CFTR gating involves multiple open and closed states, influenced by voltage.

Related Experiment Videos

  • Current noise analysis revealed two Lorentzian components.
  • Forskolin stimulation increased CFTR open probability (Po) to ~0.5 by reducing the longest closed state.
  • Identified a high open probability (high Po) mode with prolonged openings (average 13s).
  • CFTR switched between low and high Po modes, favoring high Po with increased forskolin concentration.

    • Conclusions:

    • CFTR activity is enhanced by reducing long closed states and switching to a high Po mode during stimulation.
    • This modal switching appears to be a cooperative, cellularly mediated event.
    • These findings provide insights into CFTR regulation and potential therapeutic targets.