A Voltage-Dependent Transient K+ Current in Rat Dental Pulp Cells.
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- Shibukawa Yoshiyuki
- Department of Physiology, Tokyo Dental College
Bibliographic Information
- Other Title
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- A Voltage-Dependent Transient K〔+〕 Current in Rat Dental Pulp Cells
- Voltage Dependent Transient K Current in Rat Dental Pulp Cells
- A voltage-dependent transient K<sup>+</sup> current in rat dental pulp cells
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Abstract
We characterized a voltage-dependent transient K+ current in dental pulp fibroblasts on dental pulp slice preparations by using a nystatin perforated-patch recording configuration. The mean resting membrane potential of dental pulp fibroblasts was −53 mV. Depolarizing voltage steps to +60 mV from a holding potential of −80 mV evoked transient outward currents that are activated rapidly and subsequently inactivated during pulses. The activation threshold of the transient outward current was −40 mV. The reversal potential of the current closely followed the K+ equilibrium potential, indicating that the current was selective for K+. The steady-state inactivation of the peak outward K+ currents described by a Boltzmann function with half-inactivation occurred at −47 mV. The K+ current exhibited rapid activation, and the time to peak amplitude of the current was dependent on the membrane potentials. The inactivation process of the current was well fitted with a single exponential function, and the current exhibited slow inactivating kinetics (the time constants of decay ranged from 353 ms at −20 mV to 217 ms at +60 mV). The K+ current was sensitive to intracellular Cs+ and to extracellular 4-aminopyridine in a concentration-dependent manner, but it was not sensitive to tetraethylammonium, mast cell degranulating peptide, and dendrotoxin-I. The blood depressing substance-I failed to block the K+ current. These results indicated that dental pulp fibroblasts expressed a slow-inactivating transient K+ current.<br>
Journal
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- The Japanese Journal of Physiology
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The Japanese Journal of Physiology 51 (3), 345-353, 2001
THE PHYSIOLOGICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390282680018204416
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- NII Article ID
- 10008293820
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- NII Book ID
- AA00691224
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- COI
- 1:CAS:528:DC%2BD3MXlvVanu7o%3D
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- ISSN
- 18811396
- 0021521X
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- NDL BIB ID
- 5840298
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- PubMed
- 11492959
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- Abstract License Flag
- Disallowed