Intracellular calcium regulation of connexin43
American Journal of Physiology - Cell Physiology, ISSN: 0363-6143, Vol: 293, Issue: 6, Page: C1806-13
2007
- 76Citations
- 62Captures
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Metrics Details
- Citations76
- Citation Indexes76
- 76
- CrossRef73
- Captures62
- Readers62
- 62
Article Description
The mechanism by which intracellular Ca concentration ([Ca]) regulates the permeability of gap junctions composed of connexin43 (Cx43) was investigated in HeLa cells stably transfected with this connexin. Extracellular addition of Ca in the presence of the Ca ionophore ionomycin produced a sustained elevation in [Ca] that resulted in an inhibition of the cell-to-cell transfer of the fluorescent dye Alexa fluor 594 (IC of 360 nM Ca). The Ca dependency of this inhibition of Cx43 gap junctional permeability is very similar to that described in sheep lens epithelial cell cultures that express the three sheep lens connexins (Cx43, Cx44, and Cx49). The intracellular Ca-mediated decrease in cell-to-cell dye transfer was prevented by an inhibitor of calmodulin action but not by inhibitors of Ca/ calmodulin-dependent protein kinase II or protein kinase C. In experiments that used HeLa cells transfected with a Cx43 COOH-terminus truncation mutant (Cx43), cell-to-cell coupling was similarly decreased by an elevation of [Ca] (IC of 310 nM Ca) and similarly prevented by the addition of an inhibitor of calmodulin. These data indicate that physiological concentrations of [Ca] regulate the permeability of Cx43 in a calmodulin-dependent manner that does not require the major portion of the COOH terminus of Cx43. Copyright © 2007 the American Physiological Society.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=37149018110&origin=inward; http://dx.doi.org/10.1152/ajpcell.00630.2006; http://www.ncbi.nlm.nih.gov/pubmed/17898133; https://journals.physiology.org/doi/10.1152/ajpcell.00630.2006; http://ajpcell.physiology.org/cgi/doi/10.1152/ajpcell.00630.2006; http://ajpcell.physiology.org/content/293/6/C1806
American Physiological Society
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