Abstract
Dorsal root ganglion (DRG) neurons express mRNAs for numerous two-pore domain K+ (K2P) channels and G-protein coupled receptors (GPCR). Recent studies have shown that TRESK is a major background K+ channel in DRG neurons. Here, we demonstrate the pharmacological properties of TRESK, including GPCR agonist-induced effects on DRG neurons. TRESK mRNA was highly expressed in DRG compared to brain and spinal cord. Similar to cloned TRESK, native TRESK was inhibited by acid and arachidonic acid (AA), but not zinc. Native TRESK was also activated by GPCR agonists such as acetylcholine, glutamate, and histamine. The glutamate-activated TRESK was blocked by lamotrigine in DRG neurons. In COS-7 cells transfected with mouse TRESK, 30 μM lamotrigine inhibited TRESK by ∼50%. Since TRESK is target of modulation by acid, AA, GPCR agonists, and lamotrigine, it is likely to play an active role in the regulation of excitability in DRG neurons.
Original language | English |
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Pages (from-to) | 609-615 |
Number of pages | 7 |
Journal | Biochemical and biophysical research communications |
Volume | 367 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2008 Mar 14 |
Externally published | Yes |
Bibliographical note
Funding Information:This work was supported by the Korea Research Foundation Grant funded by the Korean Government (KRF-2006-11-E00158, KRF-2006-005-J04204), and partially supported by the Basic Research Program of the KOSEF (R13-2005-012-01002-0).
Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
Keywords
- G-protein coupled receptor
- Ganglia
- Lamotrigine
- Tandem-pore domain potassium channel
ASJC Scopus subject areas
- Biophysics
- Biochemistry
- Molecular Biology
- Cell Biology