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Related Experiment Videos

CFTR targeting in epithelial cells

A P Morris1, S A Cunningham, R A Frizzell

  • 1Department of Physiology and Biophysics, Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama, Birmingham 35294-0005.

Journal of Bioenergetics and Biomembranes
|February 1, 1993
PubMed
Summary
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Epithelial cell polarization is crucial for CFTR protein targeting to the apical membrane, enabling chloride secretion. This process is essential for proper CFTR function and may influence mutant CFTR localization.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Physiology

Background:

  • The cystic fibrosis transmembrane conductance regulator (CFTR) is a critical ion channel.
  • CFTR function is essential for epithelial cell physiology.
  • Understanding CFTR localization and function is key to cystic fibrosis research.

Purpose of the Study:

  • To investigate the correlation between CFTR expression, function, and epithelial cell polarization.
  • To determine the mechanisms controlling CFTR localization in polarized versus unpolarized cells.
  • To assess the impact of polarization on cAMP-stimulated chloride secretion.

Main Methods:

  • Utilized polarized and nonpolarized HT-29 colonic cell lines.
  • Assessed CFTR mRNA and protein expression levels.

Related Experiment Videos

  • Measured CFTR glycosylation and chloride secretion in response to cAMP.
  • Examined CFTR protein localization using immunofluorescence.

    • Main Results:

    • Unpolarized cells showed similar CFTR mRNA, protein, and glycosylation levels as polarized cells.
    • Polarized cells exhibited cAMP-stimulated chloride secretion, while unpolarized cells did not.
    • CFTR protein was localized to the apical membrane in polarized cells but retained perinuclearly in unpolarized cells.
    • A peripheral targeting mechanism, active after polarization, controls CFTR apical membrane progression.

    Conclusions:

    • Epithelial cell polarization is required for the apical targeting of CFTR.
    • A post-Golgi targeting mechanism regulates N-linked glycoprotein trafficking to the apical membrane.
    • This targeting process is essential for CFTR-mediated chloride secretion and may influence mutant CFTR localization.