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A chimeric connexin forming gap junction hemichannels

A Pfahnl1, X W Zhou, R Werner

  • 1Department of Physiology and Biophysics, University of Miami School of Medicine, FL 33101, USA.

Pflugers Archiv : European Journal of Physiology
|April 1, 1997
PubMed
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A novel chimeric connexin, cx32E143, forms functional hemichannels in single cells, unlike typical connexins. This discovery advances understanding of connexin channel formation and function.

Area of Science:

  • Cell biology
  • Molecular biology
  • Biophysics

Background:

  • Connexins form gap junction channels connecting adjacent cells.
  • Typically, connexins do not form open hemichannels in single cells, except for lens connexins.

Purpose of the Study:

  • To investigate the properties of a novel chimeric connexin, cx32E143.
  • To determine if cx32E143 can form hemichannels in single cells.

Main Methods:

  • Construction of a chimeric connexin (cx32E143) by replacing the first extracellular loop of cx32 with the cx43 sequence.
  • Paired oocyte assay to assess gap junction channel formation.
  • Single oocyte electrophysiology to measure membrane conductance.
  • Uptake of tracer molecules by expressing oocytes.

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Main Results:

  • The chimera cx32E143 formed functional gap junction channels in the paired oocyte assay.
  • Single oocytes expressing cx32E143 exhibited voltage-dependent membrane conductance.
  • This conductance was sensitive to CO2, similar to wild-type cx32 gap junction channels.
  • Oocytes expressing cx32E143 showed uptake of gap junction permeable tracers.

Conclusions:

  • The chimeric connexin cx32E143 forms patent hemichannels in the plasma membrane of single oocytes.
  • This finding suggests that specific structural modifications can induce hemichannel formation in connexins.
  • Cx32E143 provides a novel tool for studying hemichannel function and regulation.