The role of potassium channels in excitable cells.

Abstract:

:Potassium (K) channels regulate cellular excitability. Their opening hyperpolarises the membrane potential and induces quiescence whereas their closure produces depolarisation and excitation. One K-channel superfamily includes the delayed rectifier (KV), the A-type (KA) and the large conductance, Ca-sensitive (BKCa) channels. These serve to terminate excitatory events and consist of a tetramer of alpha-subunits each comprising six transmembrane-spanning segments including a voltage-sensor. Additional beta-subunits which modify inactivation and voltage sensitivity may also be present. Channels in the second superfamily include the inward rectifiers (KIR) and the ATP-sensitive K-channel (KATP). Their tetrameric assembly of alpha-subunits contains only two transmembrane-spanning segments and lacks a voltage sensor. KATP is associated with a sulphonylurea binding site belonging to the ATP-binding cassette family. Although KIR conducts poorly at potentials positive to EK, both it and KATP do conduct over the physiological potential range. K-channel modulators are important in determining channel function. These include drugs like tetraethylammonium and 4-aminopyridine and more recently-discovered selective agents active at KATP and BKCa. These are typified by diazoxide, levcromakalim and glibenclamide and by NS1619, iberiotoxin and penitrem A, respectively.

authors

Edwards G,Weston AH

doi

10.1016/0168-8227(95)01080-w

subject

Has Abstract

pub_date

1995-08-01 00:00:00

pages

S57-66

eissn

0168-8227

issn

1872-8227

pii

016882279501080W

journal_volume

28 Suppl

pub_type

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