CFTR Regulation of Intracellular Calcium in Normal and Cystic Fibrosis Human Airway Epithelia

CFTR Regulation of Intracellular Calcium in Normal and Cystic Fibrosis Human Airway Epithelia In cystic fibrosis airway epithelia, mutation of the CFTR protein causes a reduced response of Cl− secretion to secretagogues acting via cAMP. Using a Ca2+ imaging system, the hypothesis that CFTR activation may permit ATP release and regulate [Ca2+] i via a receptor-mediated mechanism, is tested in this study. Application of external nucleotides produced a significant increase in [Ca2+] i in normal (16HBE14o− cell line and primary lung culture) and in cystic fibrosis (CFTE29o− cell line) human airway epithelia. The potency order of nucleotides on [Ca2+] i variation was UTP ≫ ATP > UDP > ADP > AMP > adenosine in both cell types. The nucleotide [Ca2+] i response could be mimicked by activation of CFTR with forskolin (20 μm) in a temperature-dependent manner. In 16HBE14o− cells, the forskolin-induced [Ca2+] i response increased with increasing temperature. In CFTE29o− cells, forskolin had no effect on [Ca2+] i at body temperature-forskolin-induced [Ca2+] i response in CF cells could only be observed at low experimental temperature (14°C) or when cells were cultured at 26°C instead of 37°C. Pretreatment with CFTR channel blockers glibenclamide (100 μm) and DPC (100 μm), with hexokinase (0.5 U/mg), and with the purinoceptor antagonist suramin (100 μm), inhibited the forskolin [Ca2+] i response. Together, these results demonstrate that once activated, CFTR regulates [Ca2+] i by mediating nucleotide release and activating cell surface purinoceptors in normal and CF human airway epithelia. The Journal of Membrane Biology Springer Journals

CFTR Regulation of Intracellular Calcium in Normal and Cystic Fibrosis Human Airway Epithelia

Loading next page...
Copyright © Inc. by 2000 Springer-Verlag New York
Life Sciences; Biochemistry, general; Human Physiology
Publisher site
See Article on Publisher Site

There are no references for this article.

You’re reading a free preview. Subscribe to read the entire article.

DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

Monthly Plan

  • Read unlimited articles
  • Personalized recommendations
  • No expiration
  • Print 20 pages per month
  • 20% off on PDF purchases
  • Organize your research
  • Get updates on your journals and topic searches


Start Free Trial

14-day Free Trial

Best Deal — 39% off

Annual Plan

  • All the features of the Professional Plan, but for 39% off!
  • Billed annually
  • No expiration
  • For the normal price of 10 articles elsewhere, you get one full year of unlimited access to articles.



billed annually
Start Free Trial

14-day Free Trial