Copyright © 2004, European Society of Cardiology
Phospholemman, a chaperone of Na+,K+-ATPase?
Laboratory of Physiopharmacology, Department of Pharmacology, University of Antwerp, CDE, Universiteitsplein 1, B-2610 Antwerp, Belgium
* Tel.: +32 3 820 25 87; fax: +32 3 820 25 67. Email address: paul.fransen@ua.ac.be
Received 1 October 2004; accepted 13 October 2004
| The first 10% of the full text of this article appears below. |
See article by Silverman et al. [8] (pages 93–103) in this issue.
Control of intracellular Na+ homeostasis is of crucial importance for normal functioning of the heart. Na+ extrusion in cardiomyocytes occurs mainly via the sodium pump or Na+,K+-ATPase. This enzyme consists of a catalytic
-subunit with binding sites for ATP, Na+, K+ and cardiac glycosides, and a glycoprotein β-subunit. The main function of this pump in cardiac myocytes is to maintain and restore ion gradients for Na+ and K+ during electrical activity by mediating active transport of 3Na+ out and 2K+ into the cell. Of the four
-isoforms,
1,
2 and
3 have been described in cardiac tissue,
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J. Reis, L. Zhang, S. Cala, K. N. Jew, L. C. Mace, L. Chung, R. L. Moore, and Y.-C. Ng Expression of phospholemman and its association with Na+-K+-ATPase in skeletal muscle: effects of aging and exercise training J Appl Physiol, October 1, 2005; 99(4): 1508 - 1515. [Abstract] [Full Text] [PDF] |
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