Title: Permeation properties and modulation of volume-activated Cl(-)-currents in human endothelial cells
Authors: Nilius, Bernd ×
Sehrer, J
Droogmans, Guillaume #
Issue Date: Dec-1994
Series Title: British Journal of Pharmacology. vol:112 issue:4 pages:1049-56
Abstract: 1. We have studied the permeation and pharmacological properties of a recently described volume-activated, calcium-insensitive, small-conductance Cl(-)-channel in endothelial cells from human umbilical vein. 2. The relative permeability for various anions was I- > Cl- approximately Br- > F- > gluconate- (1.63 +/- 0.36: 1:0.95 +/- 0.16:0.46 +/- 0.04:0.19 +/- 0.07, n = 10). 3. 5-Nitro-2-(3-phenylpropylamino)-benzoic acid (NPPB) induced a fast and reversible block of the current (Ki = 29 mumol l-1). 4. Extracellular ATP induced a low-affinity block of the current, that showed a small voltage-dependence (K1 = 4.9 mmol l-1 at +80 mV and K1 = 8.2 mmol l-1 at -80 mV). 5. Extracellularly applied arachidonic acid (10 mumol l-1) irreversibly blocked the current in 5 out of 9 cells. This block seems to be non-specific, because other ionic currents, e.g. inwardly rectifying K+ currents, were blocked as well. 6. Tamoxifen induced a high affinity block of the current (K1 = 2.9 mumol l-1). Block and reversal of block were however much slower than with NPPB. 7. Cytotoxic compounds, which are substrates of the P-glycoprotein multidrug transporter, loaded into endothelial cells via the patch pipette, exerted only minor effects on the volume-activated current. Vinblastine and colcemid did not affect the volume-activated current, whereas daunomycin and vincristine induced a slow 'run-down' of the current.(ABSTRACT TRUNCATED AT 250 WORDS)
ISSN: 0007-1188
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physiology Section (-)
Laboratory of Ion Channel Research
Department of Cellular and Molecular Medicine - miscellaneous
× corresponding author
# (joint) last author

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