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Related Experiment Videos

Functional interaction between CFTR and Cx45 gap junction channels expressed in oocytes.

B A Kotsias1, C Peracchia

  • 1Department of Pharmacology and Physiology, University of Rochester School of Medicine, NY 14642-8711, USA.

The Journal of Membrane Biology
|June 30, 2005
PubMed
Summary

Cystic fibrosis transmembrane conductance regulator (CFTR) influences connexin45 (Cx45) gap junction channels. CFTR reduces Cx45 channel voltage sensitivity, impacting cell-to-cell communication.

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Area of Science:

  • Molecular biology
  • Cellular physiology
  • Ion channel function

Background:

  • The cystic fibrosis transmembrane conductance regulator (CFTR) is a chloride channel.
  • CFTR is known to modulate the function of other ion channels, including connexin channels.

Purpose of the Study:

  • To investigate the functional interaction between CFTR and connexin45 (Cx45) gap junction channels.
  • To determine how CFTR affects Cx45 channel conductance and voltage sensitivity.

Main Methods:

  • Co-expression of CFTR and Cx45 in Xenopus oocytes.
  • Dual voltage clamp electrophysiology to monitor junctional conductance and voltage sensitivity.
  • Application of forskolin to modulate cAMP levels and diphenylamine carboxylic acid as a CFTR blocker.

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Main Results:

  • Forskolin application in oocytes co-expressing CFTR and Cx45 increased junctional conductance (G(j)).
  • CFTR presence reduced the transjunctional voltage sensitivity of Cx45 channels.
  • Forskolin further enhanced the reduction in voltage sensitivity.

Conclusions:

  • CFTR significantly influences cell-to-cell coupling mediated by Cx45 channels.
  • CFTR's interaction with Cx45 affects gap junction channel gating properties.