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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Bhogal, M. S. Colyer, J. |
| Description | Author Affiliation: Bhogal MS ( School of Biochemistry and Molecular Biology, University of Leeds, Leeds, LS2 9JT United Kingdom.); |
| Abstract | Nonmuscle cells have almost ubiquitously evolved a mechanism to detect and prevent Ca2+ store depletion-store operated calcium entry. No such mechanism has, as yet, been reported in cardiac myocytes. However, it is conceivable that such a mechanism may play an important role in cardiac Ca2+ homeostasis to ensure the availability of sufficient stored Ca2+ to maintain normal excitation contraction coupling. We present data that confirms the presence of a mechanism that is able to monitor the Ca2+ load of the SR and initiate a signaling process to accelerate Ca2+ uptake by the SR when store depletion is detected. Depletion of SR Ca2+ activates a protein kinase, the principal SR substrate of which is phospholamban. Phosphorylation of this SR protein promotes Ca2+ pump activity and therefore store refilling. Furthermore, a protein kinase activity associated with the SR that is inhibited by Ca2+ ions has been identified. We have measured lumenal [Ca2+] by using a fluorescent Ca2+ indicator and found that by initiating Ca2+ uptake and increasing Ca2+ load, we can inhibit the protein kinase activity associated with the SR. This confirms that a protein kinase, that is regulated by lumenal [Ca2+], has been identified and represents part of a previously unidentified signalling cascade. This local feedback mechanism would allow the myocyte to detect and prevent SR Ca2+ load depletion. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 4 |
| Volume Number | 95 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1998-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Calcium-Binding Proteins Metabolism Calcium Myocardium Sarcoplasmic Reticulum Animals Biological Transport, Active Calcium-Transporting ATPases Antagonists & Inhibitors Cell Compartmentation Cyclic AMP-Dependent Protein Kinases Enzyme Inhibitors Pharmacology Fluorescent Dyes Phosphorylation Phosphoserine Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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