Lysophospholipids open the two-pore domain mechano-gated K(+) channels TREK-1 and TRAAK.
The two-pore (2P) domain K(+) channels TREK-1 and TRAAK are opened by membrane stretch as well as arachidonic acid (AA) (Patel, A. J., Honoré, E., Maingret, F., Lesage, F., Fink, M., Duprat, F., and Lazdunski, M. (1998) EMBO J. 17, 4283-4290; Maingret, F., Patel, A. J., Lesage, F., Lazdunski, M., and Honoré, E. (1999) J. Biol. Chem. 274, 26691-26696; Maingret, F., Fosset, M., Lesage, F., Lazdunski, M. , and Honoré, E. (1999) J. Biol. Chem. 274, 1381-1387. We demonstrate that lysophospholipids (LPs) and platelet-activating factor also produce large specific and reversible activations of TREK-1 and TRAAK. LPs activation is a function of the size of the polar head and length of the acyl chain but is independent of the charge of the molecule. Bath application of lysophosphatidylcholine (LPC) immediately opens TREK-1 and TRAAK in the cell-attached patch configuration. In excised patches, LPC activation is lost, whereas AA still produces maximal opening. The carboxyl-terminal region of TREK-1, but not the amino terminus and the extracellular loop M1P1, is critically required for LPC activation. LPC activation is indirect and may possibly involve a cytosolic factor, whereas AA directly interacts with either the channel proteins or the bilayer and mimics stretch. Opening of TREK-1 and TRAAK by fatty acids and LPs may be an important switch in the regulation of synaptic function and may also play a protective role during ischemia and inflammation.
Maingret
F
F
Institut de Pharmacologie Moléculaire et Cellulaire, CNRS UPR 411, Sophia Antipolis, 06560 Valbonne, France.
Patel
A J
AJ
Lesage
F
F
Lazdunski
M
M
Honoré
E
E
D000584:Amiloride / Q000494:pharmacology; D000818:Animals; D016718:Arachidonic Acid / Q000494:pharmacology; D019556:COS Cells; D002746:Chlorpromazine / Q000494:pharmacology; D015640:Ion Channel Gating / Q000187:drug effects*; D008244:Lysophosphatidylcholines / Q000494:pharmacology; D008246:Lysophospholipids / Q000494:pharmacology*; D008564:Membrane Potentials / Q000187:drug effects / Q000502:physiology; D016297:Mutagenesis, Site-Directed; D015221:Potassium Channels / Q000187:drug effects / Q000502:physiology*; D024683:Potassium Channels, Tandem Pore Domain; D011994:Recombinant Proteins / Q000187:drug effects / Q000378:metabolism; D013329:Structure-Activity Relationship; D014162:Transfection
D008244:Lysophosphatidylcholines; D008246:Lysophospholipids; D015221:Potassium Channels; D024683:Potassium Channels, Tandem Pore Domain; D011994:Recombinant Proteins; C103742:potassium channel protein TREK-1; D016718:Arachidonic Acid; D000584:Amiloride; D002746:Chlorpromazine