Article ; Online: Computational modeling of anoctamin 1 calcium-activated chloride channels as pacemaker channels in interstitial cells of Cajal.
American journal of physiology. Gastrointestinal and liver physiology
2014 Volume 306, Issue 8, Page(s) G711–27
Abstract: Interstitial cells of Cajal (ICC) act as pacemaker cells in the gastrointestinal tract by generating electrical slow waves to regulate rhythmic smooth muscle contractions. Intrinsic Ca(2+) oscillations in ICC appear to produce the slow waves by ... ...
Abstract | Interstitial cells of Cajal (ICC) act as pacemaker cells in the gastrointestinal tract by generating electrical slow waves to regulate rhythmic smooth muscle contractions. Intrinsic Ca(2+) oscillations in ICC appear to produce the slow waves by activating pacemaker currents, currently thought to be carried by the Ca(2+)-activated Cl(-) channel anoctamin 1 (Ano1). In this article we present a novel model of small intestinal ICC pacemaker activity that incorporates store-operated Ca(2+) entry and a new model of Ano1 current. A series of simulations were carried out with the ICC model to investigate current controversies about the reversal potential of the Ano1 Cl(-) current in ICC and to predict the characteristics of the other ion channels that are necessary to generate slow waves. The model results show that Ano1 is a plausible pacemaker channel when coupled to a store-operated Ca(2+) channel but suggest that small cyclical depolarizations may still occur in ICC in Ano1 knockout mice. The results predict that voltage-dependent Ca(2+) current is likely to be negligible during the slow wave plateau phase. The model shows that the Cl(-) equilibrium potential is an important modulator of slow wave morphology, highlighting the need for a better understanding of Cl(-) dynamics in ICC. |
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MeSH term(s) | Animals ; Anoctamin-1 ; Calcium/metabolism ; Chloride Channels/metabolism ; Computer Simulation ; Gastrointestinal Motility/physiology ; Interstitial Cells of Cajal/physiology ; Mice ; Models, Biological ; Muscle Contraction/physiology ; Muscle, Smooth/metabolism |
Chemical Substances | ANO1 protein, mouse ; Anoctamin-1 ; Chloride Channels ; Calcium (SY7Q814VUP) |
Language | English |
Publishing date | 2014-01-30 |
Publishing country | United States |
Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't |
ZDB-ID | 603840-2 |
ISSN | 1522-1547 ; 0193-1857 |
ISSN (online) | 1522-1547 |
ISSN | 0193-1857 |
DOI | 10.1152/ajpgi.00449.2013 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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