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| Content Provider | PubMed Central |
|---|---|
| Author | Varnum, M. D. Busch, A. E. Bond, C. T. Maylie, J. Adelman, J. P. |
| Abstract | A clone encoding the guinea pig (gp) min K potassium channel was isolated and expressed in Xenopus oocytes. The currents, gpIsK, exhibit many of the electrophysiological and pharmacological properties characteristic of gpIKs, the slow component of the delayed rectifier potassium conductance in guinea pig cardiac myocytes. Depolarizing commands evoke outward potassium currents that activate slowly, with time constants on the order of seconds. The currents are blocked by the class III antiarrhythmic compound clofilium but not by the sotalol derivative E4031 or low concentrations of lanthanum. Like IKs in guinea pig myocytes, gpIsK is modulated by stimulation of protein kinase A and protein kinase C (PKC). In contrast to rat and mouse IsK, which are decreased upon stimulation of PKC, myocyte IK and gpIsK in oocytes are increased after PKC stimulation. Substitution of an asparagine residue at position 102 by serine (N102S), the residue found in the analogous position of the mouse and rat min K proteins, results in decreased gpIsK in response to PKC stimulation. These results support the hypothesis that the min K protein underlies the slow component of the delayed rectifier potassium current in ventricular myocytes and account for the species-specific responses to stimulation of PKC. |
| Starting Page | 11528 |
| File Format | |
| ISSN | 10916490 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 24 |
| Volume Number | 90 |
| Language | English |
| Publisher Date | 1993-12-15 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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