Dopamine receptor agonists differ in their actions on cardiac ion channels
| Autor: | Martin D. Meglasson, Michael A. Clark, Karen L. Rutherford-Root, Nicole R. Higdon, Judy A. Lawson, Raymond S. Hurst, William G. McDonald, Joseph V. Haas, James P. McGrath |
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| Rok vydání: | 2003 |
| Předmět: |
Male
medicine.medical_specialty Potassium Channels hERG Action Potentials CHO Cells In Vitro Techniques Dopamine agonist Receptors Dopamine Purkinje Fibers Dogs Cricetinae Internal medicine Potassium Channel Blockers medicine Animals Repolarization Cation Transport Proteins Pharmacology Pergolide Dose-Response Relationship Drug biology Chemistry Cardiac action potential Sumanirole Ether-A-Go-Go Potassium Channels Apomorphine Endocrinology Ropinirole Potassium Channels Voltage-Gated Dopamine Agonists biology.protein medicine.drug |
| Zdroj: | European Journal of Pharmacology. 482:31-37 |
| ISSN: | 0014-2999 |
| DOI: | 10.1016/j.ejphar.2003.09.054 |
| Popis: | Four dopamine receptor agonists used for the treatment of Parkinson's disease (apomorphine, pergolide, ropinirole and sumanirole) were evaluated for the ability to block human ether-a-go-go related gene (hERG) K(+) channels and to modify the duration of canine Purkinje fiber action potentials. Apomorphine, pergolide and ropinirole blocked the hERG-mediated currents with IC(50) values of 2.4, 0.12 and 1.2 microM, respectively. When evaluated in an action potential duration assay, pergolide significantly shortened action potential duration at 90% repolarization (APD(90)) whereas apomorphine and ropinirole significantly prolonged repolarization. Sumanirole only partially blocked hERG K(+) channels at the highest tested concentration (10 microM) and did not modify action potential duration over the tested concentration range (0.65-65 microM). Taken together, these data provide evidence that dopamine receptor agonists developed for the treatment of Parkinson's disease differentially influence hERG K(+) channel function and cardiac action potential duration. |
| Databáze: | OpenAIRE |
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