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The Journal of General Physiology, Vol 86, 1-30, Copyright © 1985 by The Rockefeller University Press
ARTICLES |
BP Bean
Currents through Ca channels were recorded in single canine atrial cells using whole-cell recording with patch pipettes. Two components of Ca channel current could be distinguished. One ("Ifast") was present only if cells were held at negative potentials, was most prominent for relatively small depolarizations, and inactivated within tens of milliseconds. The other ("Islow"), corresponding to the Ca current previously reported in single cardiac cells, persisted even at relatively positive holding potentials, required stronger depolarizations for maximal current, and inactivated much more slowly. Both currents were unaffected by tetrodotoxin and both were reduced by Co. Ifast had the same size and kinetics when Ca was exchanged for Ba, while Islow was bigger and slower with Ba as the charge carrier. In isotonic BaCl2, fluctuation analysis showed that Ifast had a smaller single channel current than Islow. Islow was much more sensitive to block by nitrendipine than was Ifast; also, Islow, but not Ifast, was increased by the dihydropyridine drug BAY K8644. Isoproterenol produced large increases in Islow but had no effect on Ifast.
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