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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Hermsteiner, M. Vogel, W. Jonas, P. Bräu, M. E. |
| Description | Author Affiliation: Jonas P ( Physiologisches Institut der Justus-Liebig-Universität, Giessen, Federal Republic of Germany.); |
| Abstract | Amphibian myelinated nerve fibers were treated with collagenase and protease. Axons with retraction of the myelin sheath were patch-clamped in the nodal and paranodal region. One type of Na channel was found. It has a single-channel conductance of 11 pS (15 degrees C) and is blocked by tetrodotoxin. Averaged events show the typical activation and inactivation kinetics of macroscopic Na current. Three potential-dependent K channels were identified (I, F, and S channel). The I channel, being the most frequent type, has a single-channel conductance of 23 pS (inward current, 105 mM K on both sides of the membrane), activates between -60 and -30 mV, deactivates with intermediate kinetics, and is sensitive to dendrotoxin. The F channel has a conductance of 30 pS, activates between -40 and 60 mV, and deactivates with fast kinetics. The former inactivates within tens of seconds; the latter inactivates within seconds. The third type, the S channel, has a conductance of 7 pS and deactivates slowly. All three channels can be blocked by external tetraethylammonium chloride. We suggest that these distinct K channel types form the basis for the different components of macroscopic K current described previously. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 18 |
| Volume Number | 86 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1989-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Nerve Fibers, Myelinated Physiology Potassium Channels Sciatic Nerve Sodium Channels Animals Axons Ultrastructure Kinetics Membrane Potentials Xenopus Laevis Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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