Channelpedia

PubMed 19244527


Referenced in Channelpedia wiki pages of: none

Automatically associated channels: SK1 , SK3



Title: Glucose inhibition persists in hypothalamic neurons lacking tandem-pore K+ channels.

Authors: Alice Guyon, Magalie P Tardy, Carole Rovère, Jean-Louis Nahon, Jacques Barhanin, Florian Lesage

Journal, date & volume: J. Neurosci., 2009 Feb 25 , 29, 2528-33

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/19244527


Abstract
Glucose sensing by hypothalamic neurons triggers adaptive metabolic and behavioral responses. In orexin neurons, extracellular glucose activates a leak K(+) current promoting electrical activity inhibition. Sensitivity to external acidification and halothane, and resistance to ruthenium red designated the tandem-pore K(+) (K(2P)) channel subunit TASK3 as part of the glucose-induced channel. Here, we show that glucose inhibition and its pH sensitivity persist in mice lacking TASK3 or TASK1, or both subunits. We also tested the implication of another class of K(2P) channels activated by halothane. In the corresponding TREK1/2/TRAAK triple knock-out mice, glucose inhibition persisted in hypothalamic neurons ruling out a major contribution of these subunits to the glucose-activated K(+) conductance. Finally, block of this glucose-induced hyperpolarizing current by low Ba(2+) concentrations was consistent with the conclusion that K(2P) channels are not required for glucosensing in hypothalamic neurons.