Properties of a potassium channel in the basolateral membrane of renal proximal convoluted tubule and the effect of cyclosporine on it

Title:

Properties of a potassium channel in the basolateral membrane of renal proximal convoluted tubule and the effect of cyclosporine on it

Creator:

Ye, B., Liu, Y., and Zhang, Y.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:494b6887-87d6-4e81-b8b0-43b427b44df8
uuid:494b6887-87d6-4e81-b8b0-43b427b44df8

Subject:

Proximal concoluted tubule, Basoteral membrane, Potassium channel, and Cyclosporine A

Type:

article, model:article, and TEXT

Description:

We studied the potassium channel in the basolateral membrane of the rat proximal convoluted tubule as affected by cyclosporine A. Proximal convoluted tubules were dissected from the rat kidney under a stereoscopic microscope, without a preliminary enzyme treatment. The standard configuration for single-channel tight seal patch-clamp technique was used to record channel currents. A small conductance, stretch-sensitive potassium channel could be observed spontaneously in most of the cell-attached patches as the gigaohm seal was formed. In the inside-out configuration, channel activity was diminished. The K+ channel appeared to be an inward rectifier. The limiting inward slope conductance was 28.3±1.7 pS (Vp was between 40 mV and 80 mV, n=6) and the outward chord conductance was 5.6±0.3 pS (Vp was between -40 and -60 mV, n=5). The open dwell time constants of the potassium channel were 0.524 ms and 5.087 ms, while the closed dwell time constants were 1.029 ms and 16.500 ms. The opening probability of the channel decreased when the extracellular fluid was acidified. Cyclosporine A had no significant effect on the potassium channel of the proximal tubular cell in the basolateral membrane at concentrations of 10 and 50 μg/ml, while at 100 μg/ml, it decreased the opening probability.

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Physiological research | 2006 Volume:55 | Number:6

Harvested from:

CDK

Metadata only:

false