Voltage clamp studies of a transient outward membrane current in gastropod neural somata
- 1 February 1971
- journal article
- Published by Wiley in The Journal of Physiology
- Vol. 213 (1), 21-30
- https://doi.org/10.1113/jphysiol.1971.sp009365
Abstract
1. Outward directed membrane currents have been studied in voltage clamp experiments on isolated neural somata of the marine gastropod Anisodoris.2. Stepping the membrane potential from a hyperpolarized level to a value in the neighbourhood of resting potential (-35 to -50 mV at 5 degrees C) results in an outward current transient, I(A), which is apparently carried by potassium ions.3. The peak amplitude of I(A) is dependent upon both the holding voltage level and the test step voltage while the time courses of development and decay are independent of, or only slightly dependent on, these parameters.4. The developing and decaying phases of I(A) are approximated by exponentials, leading to time constants for development of 10-25 msec and for decay of 220-600 msec over the aggregate of cells studied (data at 5 degrees C). Q(10) for the processes is approximately 3.5. It is concluded that the transport mechanism for I(A) is at least operationally distinct from the mechanism underlying delayed outward current, I(K).Keywords
This publication has 3 references indexed in Scilit:
- Inward and delayed outward membrane currents in isolated neural somata under voltage clampThe Journal of Physiology, 1971
- Behavior of Delayed Current under Voltage Clamp in the Supramedullary Neurons of PufferThe Journal of general physiology, 1966
- A quantitative description of membrane current and its application to conduction and excitation in nerveThe Journal of Physiology, 1952