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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Singleton, C. B. Tie, H. Wyse, K. R. Bursill, J. A. Walker, B. D. Valenzuela, S. M. Campbell, T. J. Qiu, M. R. Breit, S. N. |
| Description | Author Affiliation: Singleton CB ( Department of Medicine, The University of New South Wales, Victor Chang Cardiac Research Institute, Sydney, Australia.) |
| Abstract | 1. The Kv4.3 gene is believed to encode a large proportion of the transient outward current (Ito), responsible for the early phase of repolarization of the human cardiac action potential. There is evidence that this current is involved in the dispersion of refractoriness which develops during myocardial ischaemia and which predisposes to the development of potentially fatal ventricular tachyarrhythmias. 2. Epidemiological, clinical, animal, and cellular studies indicate that these arrhythmias may be ameliorated in myocardial ischaemia by n-3 polyunsaturated fatty acids (n-3 PUFA) present in fish oils. 3. We describe stable transfection of the Kv4.3 gene into a mammalian cell line (Chinese hamster ovary cells), and using patch clamp techniques have shown that the resulting current closely resembles human Ito. 4. The current is rapidly activating and inactivating, with both processes being well fit by double exponential functions (time constants of 3.8 +/- 0.2 and 5.3 +/- 0.4 ms for activation and 20.0 +/- 1.2 and 96.6+/-6.7 ms for inactivation at +45 mV at 23 degrees C). Activation and steady state inactivation both show voltage dependence (V1/2 of activation= -6.7+/-2.5 mV, V1,2 of steady state inactivation= -51.3+/-0.2 mV at 23 degrees C). Current inactivation and recovery from inactivation are faster at physiologic temperature (37 degrees C) compared to room temperature (23 degrees C). 5. The n-3 PUFA docosahexaenoic acid blocks the Kv4.3 current with an IC50 of 3.6 micromol L(-1). Blockade of the transient outward current may be an important mechanism by which n-3 PUFA provide protection against the development of ventricular fibrillation during myocardial ischaemia. |
| ISSN | 00071188 |
| e-ISSN | 14765381 |
| Journal | British Journal of Pharmacology |
| Issue Number | 4 |
| Volume Number | 127 |
| Language | English |
| Publisher | Wiley Online Library(on behalf of The British Pharmacological Society) |
| Publisher Date | 1999-06-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Fatty Acids, Omega-3 Pharmacology Potassium Channel Blockers Potassium Channels, Voltage-Gated Potassium Channels Animals CHO Cells Cricetinae Docosahexaenoic Acids Recombinant Proteins Antagonists & Inhibitors Shal Potassium Channels Temperature Time Factors Research Support, Non-U.S. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology |
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