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Previous Article | Next Article
The Journal of Neuroscience, October 1, 2001, 21(19):7491-7505
CNS Distribution of Members of the Two-Pore-Domain (KCNK) Potassium Channel Family
Edmund M. Talley1, Guillermo Solórzano1, Qiubo Lei1, Donghee Kim2, and Douglas A. Bayliss1 1 Department of Pharmacology, University of Virginia, Charlottesville, Virginia 22908, and 2 Department of Physiology and Biophysics, Finch University of Health Sciences, The Chicago Medical School, North Chicago, Illinois 60064
Two-pore-domain potassium (K+) channels are substrates for resting K+ currents in neurons. They are major targets for endogenous modulators, as well as for clinically important compounds such as volatile anesthetics. In the current study, we report on the CNS distribution in the rat and mouse of mRNA encoding seven two-pore-domain K+ channel family members: TASK-1 (KCNK3), TASK-2 (KCNK5), TASK-3 (KCNK9), TREK-1 (KCNK2), TREK-2 (KCNK10), TRAAK (KCNK4), and TWIK-1 (KCNK1). All of these genes were expressed in dorsal root ganglia, and for all of the genes except TASK-2, there was a differential distribution in the CNS. For TASK-1, highest mRNA accumulation was seen in the cerebellum and somatic motoneurons. TASK-3 was much more widely distributed, with robust expression in all brain regions, with particularly high expression in somatic motoneurons, cerebellar granule neurons, the locus ceruleus, and raphe nuclei and in various nuclei of the hypothalamus. TREK-1 was highest in the striatum and in parts of the cortex (layer IV) and hippocampus (CA2 pyramidal neurons). mRNA for TRAAK also was highest in the cortex, whereas expression of TREK-2 was primarily restricted to the cerebellar granule cell layer. There was widespread distribution of TWIK-1, with highest levels in the cerebellar granule cell layer, thalamic reticular nucleus, and piriform cortex. The differential expression of each of these genes likely contributes to characteristic excitability properties in distinct populations of neurons, as well as to diversity in their susceptibility to modulation.
Key words: potassium channel; in situ hybridization; KCNK; TASK; TREK; TRAAK; TWIK
Copyright © 2001 Society for Neuroscience 0270-6474/01/21197491-15$05.00/0
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