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Updated: Jul 15, 2026
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Functional Reconstitution and Channel Activity Measurements of Purified Wildtype and Mutant CFTR Protein
Published on: March 9, 2015
CFTR-dependent Cl- secretion in Xenopus laevis lung epithelium
Dagmar Sommer1, Roman Bogdan, Jens Berger
1Institute of Animal Physiology, Justus-Liebig University of Giessen, Wartweg 95, 35392 Giessen, Germany.
Respiratory Physiology & Neurobiology
|May 11, 2007
Summary
Xenopus laevis lungs possess functional cystic fibrosis transmembrane conductance regulator (CFTR) channels, crucial for ion transport. This discovery establishes the frog lung as a valuable model for studying pulmonary epithelial function.
Area of Science:
- Physiology
- Molecular Biology
- Comparative Genomics
Background:
- The cystic fibrosis transmembrane conductance regulator (CFTR) plays a vital role in epithelial ion transport.
- Understanding CFTR function in diverse species can offer insights into respiratory diseases.
Purpose of the Study:
- To investigate the presence and function of a CFTR homolog in Xenopus laevis lung tissue.
- To evaluate Xenopus lung as a model for studying pulmonary ion transport.
Main Methods:
- Electrophysiological Ussing chamber measurements to assess ion current.
- Unidirectional flux measurements using radioactive tracers.
- Molecular techniques including RT-PCR, Western blot, and immunohistochemistry.
Main Results:
- CFTR blockers significantly reduced short-circuit current, indicating active chloride secretion.
- Radioactive tracer experiments confirmed net chloride secretion.
- Xenopus lung epithelia responded to CFTR activators and inhibitors, with molecular methods confirming CFTR presence.
Conclusions:
- Xenopus lung epithelium expresses functional CFTR channels.
- The Xenopus lung serves as a valuable model for investigating pulmonary epithelial ion transport and CFTR function.
