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Membrane potential plays a dual role for chloride transport across toad skin

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The Cl- -current through toad skin epithelium depends on the potential in a way consistent with a potential-controlled Cl- permeability. Computer analysis of the Koefoed-Johnsen Ussing two-membrane model provided with constant membrane permeabilities indicates that the voltage- and time-dependent currents are not caused by a trivial Goldmand-type rectification and ion redistributions following transepithelial potential pertubations. Extended with a dynamic Cl- permeability in the apical membrane according to a Hodgkin-Huxley kinetic scheme, the model predicts voltage clamp data which closely resemble experimental observations. This extension of the classic frog skin model implies that the Cl- permeability is activated by a voltage change caused by the inward Na+ current through the apical membrane.
OriginalsprogEngelsk
TidsskriftBBA General Subjects
Vol/bind728
Udgave nummer3
Sider (fra-til)455-9
Antal sider5
ISSN0304-4165
StatusUdgivet - 9 mar. 1983

ID: 103932136