scholarly journals Single-channel, macroscopic, and gating currents from sodium channels in the squid giant axon

1991 ◽  
Vol 60 (6) ◽  
pp. 1499-1510 ◽  
Author(s):  
C.A. Vandenberg ◽  
F. Bezanilla
Keyword(s):  
Sodium Channels ◽  
Single Channel ◽  
Giant Axon ◽  
Squid Giant Axon ◽  
Gating Currents

scholarly journals Analysis of sodium current fluctuations in the cut-open squid giant axon.

1984 ◽  
Vol 83 (2) ◽  
pp. 133-142 ◽  
Author(s):  
I Llano ◽  
F Bezanilla
Keyword(s):  
Sodium Channel ◽  
Sodium Channels ◽  
Sodium Current ◽  
Giant Axon ◽  
Squid Giant Axon ◽  
Statistical Techniques ◽  
Current Fluctuations ◽  
Small Populations ◽  
Squid Axon ◽  
Single Sodium Channel

Patch pipettes were used to record the current arising from small populations of sodium channels in voltage-clamped cut-open squid axons. The current fluctuations associated with the time-variant sodium conductance were analyzed with nonstationary statistical techniques in order to obtain an estimate for the conductance of a single sodium channel. The results presented support the notion that the open sodium channel in the squid axon has only one value of conductance, 3.5 pS.

Interaction of DDT with sodium channels in squid giant axon membranes

Neuroscience ◽  
1981 ◽  
Vol 6 (11) ◽  
pp. 2253-2258 ◽  
Author(s):  
A.E. Lund ◽  
T. Narahashi
Keyword(s):  
Sodium Channels ◽  
Giant Axon ◽  
Squid Giant Axon ◽  
Axon Membranes

Pressure dependence of sodium gating currents in the squid giant axon

1984 ◽  
Vol 11 (2) ◽  
pp. 137-147 ◽  
Author(s):  
F. Conti ◽  
I. Inoue ◽  
F. Kukita ◽  
W. St�hmer
Keyword(s):  
Pressure Dependence ◽  
Giant Axon ◽  
Squid Giant Axon ◽  
Gating Currents

The rate of action of tetrodotoxin on sodium conductance in the squid giant axon

1975 ◽  
Vol 270 (908) ◽  
pp. 365-375 ◽  
Keyword(s):  
Schwann Cell ◽  
Sodium Channels ◽  
Binding Sites ◽  
Node Of Ranvier ◽  
Giant Axon ◽  
Squid Giant Axon ◽  
Free Diffusion ◽  
Sodium Conductance ◽  
In Series ◽  
Order Of Magnitude

When tetrodotoxin is applied to or washed away from the squid giant axon, the rates at which the sodium conductance is blocked and unblocked are an order of magnitude smaller than those reported for the isolated node of Ranvier. This slowing is to be expected if in squid the tetrodotoxin binding sites act as a saturable sink in series with the barrier to free diffusion imposed by the presence of the Schwann cell. A comparison has been made between the rates observed experimentally and those calculated for a computer model of the system, in order to estimate the apparent density in the membrane of both specific and non-specific tetrodotoxin binding sites. The figure thus obtained for the number of sodium channels in the squid giant axon, several hundred per square micrometre, agrees well with those derived from other lines of argument.

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