Channelpedia

SK channels in excitability, pacemaking and synaptic integration.


Authors: Chris T Bond, James Maylie, John P Adelman

Journal, date & volume: Curr. Opin. Neurobiol., 2005 Jun , 15, 305-11

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/15922588

Channelpedia reference in: SK3

Abstract
Small conductance calcium-activated potassium channels link elevations of intracellular calcium ions to membrane potential, exerting a hyperpolarizing influence when activated. The consequences of SK channel activity have been revealed by the specific blocker apamin, a peptide toxin from honeybee venom. Recent studies have revealed unexpected roles for SK channels in fine-tuning intrinsic cell firing properties and in responsiveness to synaptic input. They have also identified specific roles for different SK channel subtypes. A host of Ca2+ sources, including distinct subtypes of voltage-dependent calcium channels, intracellular Ca2+ stores and Ca2+-permeable ionotropic neurotransmitter receptors, activate SK channels. The macromolecular complex in which the Ca2+ source, SK channels and various modulators are assembled determines the kinetics and consequences of SK channel activation.