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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Feinmark, Steven J. Rosen, Tove S. Argenziano, Michael Harleton, Erin Rosen, Michael R. Danilo, Peter Comas, George M. Besana, Alessandra Robinson, Richard B. |
| Description | Author Affiliation: Harleton E ( Department of Pharmacology, Columbia University Medical Center, New York, New York 10032, USA.) |
| Abstract | Peri-operative atrial fibrillation (peri-op AF) is a common complication following thoracic surgery. This arrhythmia is thought to be triggered by an inflammatory response and can be reproduced in various animal models. Previous work has shown that the lipid inflammatory mediator, platelet-activating factor (PAF), synthesized by activated neutrophils, can induce atrial and ventricular arrhythmias as well as repolarization abnormalities in isolated ventricular myocytes. We have previously shown that carbamylated PAF-induced repolarization abnormalities result from the protein kinase C (PKC) ε-dependent phosphorylation of the two-pore domain potassium channel TASK-1. We now demonstrate that canine peri-op AF is associated with the phosphorylation-dependent loss of TASK-1 current. Further studies identified threonine 383 in the C terminus of human and canine TASK-1 as the phosphorylation site required for PAF-dependent inhibition of the channel. Using a novel phosphorylation site-specific antibody targeting the phosphorylated channel, we have determined that peri-op AF is associated with the loss of TASK-1 current and increased phosphorylation of TASK-1 at this site. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 4 |
| Volume Number | 288 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2013-01-25 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Atrial Fibrillation Metabolism Nerve Tissue Proteins Potassium Channels, Tandem Pore Domain Animals CHO Cells Cricetinae Cricetulus Electrophysiology Inflammation Muscle Cells Perioperative Period Peroxidase Phosphorylation Platelet Activating Factor Protein Kinase C Threonine Chemistry Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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