Cl− Currents Activated by Extracellular Nucleotides in Human Bronchial Cells

Cl− Currents Activated by Extracellular Nucleotides in Human Bronchial Cells The perforated-patch technique was used to study the response of human bronchial cells to extracellular nucleotides. ATP or UTP (100 μm) elicited a complex response consisting of a large transient membrane current increase followed by a relatively small sustained level. These two phases were characterized by different current kinetics. Throughout the transient phase (2–3 min) the membrane current (I p ) displayed slow activation and deactivation kinetics at depolarizing and hyperpolarizing potentials respectively. At steady-state (I s ) the relaxation at hyperpolarizing potential disappeared whereas at positive membrane potentials the current became slightly deactivating. The I s amplitude was dependent on the extracellular Ca2+ concentration, being completely inhibited in Ca2+-free medium. Cell pre-incubation with the membrane-permeable chelating agent BAPTA/AM prevented completely the response to nucleotides, thus suggesting that both I p and I s were dependent on intracellular Ca2+. The presence of a hypertonic medium during nucleotide stimulation abolished I s leaving I p unchanged. On the contrary, niflumic acid, a blocker of Ca2+-activated Cl− channels, prevented completely I p without reducing significantly I s . 1,9-dideoxyforskolin fully inhibited I s but also reduced I p . Replacement of extracellular Cl− with aspartate demonstrated that the currents activated by nucleotides were Cl− selective. I p resulted five times more Cl− selective than I s with respect to aspartate. Taken together, our results indicate that ATP and UTP activate two types of Cl− currents through a Ca2+-dependent mechanism. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Membrane Biology Springer Journals

Cl− Currents Activated by Extracellular Nucleotides in Human Bronchial Cells

Loading next page...
 
/lp/springer_journal/cl-currents-activated-by-extracellular-nucleotides-in-human-bronchial-9X41P1N0x5
Publisher
Springer-Verlag
Copyright
Copyright © Inc. by 1997 Springer-Verlag New York
Subject
Life Sciences; Biochemistry, general; Human Physiology
ISSN
0022-2631
eISSN
1432-1424
D.O.I.
10.1007/s002329900209
Publisher site
See Article on Publisher Site

Abstract

The perforated-patch technique was used to study the response of human bronchial cells to extracellular nucleotides. ATP or UTP (100 μm) elicited a complex response consisting of a large transient membrane current increase followed by a relatively small sustained level. These two phases were characterized by different current kinetics. Throughout the transient phase (2–3 min) the membrane current (I p ) displayed slow activation and deactivation kinetics at depolarizing and hyperpolarizing potentials respectively. At steady-state (I s ) the relaxation at hyperpolarizing potential disappeared whereas at positive membrane potentials the current became slightly deactivating. The I s amplitude was dependent on the extracellular Ca2+ concentration, being completely inhibited in Ca2+-free medium. Cell pre-incubation with the membrane-permeable chelating agent BAPTA/AM prevented completely the response to nucleotides, thus suggesting that both I p and I s were dependent on intracellular Ca2+. The presence of a hypertonic medium during nucleotide stimulation abolished I s leaving I p unchanged. On the contrary, niflumic acid, a blocker of Ca2+-activated Cl− channels, prevented completely I p without reducing significantly I s . 1,9-dideoxyforskolin fully inhibited I s but also reduced I p . Replacement of extracellular Cl− with aspartate demonstrated that the currents activated by nucleotides were Cl− selective. I p resulted five times more Cl− selective than I s with respect to aspartate. Taken together, our results indicate that ATP and UTP activate two types of Cl− currents through a Ca2+-dependent mechanism.

Journal

The Journal of Membrane BiologySpringer Journals

Published: Apr 1, 1997

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 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

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

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off