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ClC-2 Cl- channels in human lung epithelia: activation by arachidonic acid, amidation, and acid-activated omeprazole

J Cuppoletti1, K P Tewari, A M Sherry

  • 1Department of Molecular and Cellular Physiology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267-0576, USA. John.Cuppoletti@uc.edu

American Journal of Physiology. Cell Physiology
|June 13, 2001
PubMed

Insights

ClC-2 chloride channels are present in human lung cells and can be activated by new compounds. This discovery supports ClC-2 as a potential therapeutic target for cystic fibrosis treatment.

Area of Science:

  • Molecular Biology
  • Ion Channel Physiology
  • Respiratory Medicine

Background:

  • Cystic Fibrosis (CF) is a genetic disorder impacting lung function.
  • Chloride (Cl-) channels are crucial for maintaining epithelial homeostasis.
  • ClC-2 channels are a potential therapeutic target for CF.

Purpose of the Study:

  • To determine the presence of ClC-2 channels in human lung epithelia.
  • To identify novel activators of ClC-2 channels for CF therapy.

Main Methods:

  • Reverse Transcription Polymerase Chain Reaction (RT-PCR) to detect ClC-2 mRNA.
  • Patch clamp electrophysiology to measure Cl- currents.
  • Utilized specific inhibitors to isolate ClC-2 channel activity.

Main Results:

  • ClC-2 mRNA was detected in Calu-3, A549, and BEAS-2B lung cell lines and buccal cells.
  • Amidation, acid-activated omeprazole, and arachidonic acid activated ClC-2 channels.
  • Activation was confirmed in cells from both healthy individuals and CF patients.

Conclusions:

  • ClC-2 channels are expressed in human lung epithelia.
  • Novel activation mechanisms for ClC-2 channels were identified.
  • ClC-2 channels represent a promising therapeutic target for cystic fibrosis.

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