Abstract
Potassium channels are one of the fundamental requirements for the generation of action potentials in the nervous system, and their characteristics shape the output of neurons in response to synaptic input. We review here the distribution and function of a high-threshold potassium channel (Kv3.3) in the electrosensory lateral line lobe of the weakly electric fish Apteronotus leptorhynchus, with particular focus on the pyramidal cells in this brain structure. These cells contain both high-threshold Kv3.3 channels, as well as low-threshold potassium channels of unknown molecular identity. Kv3.3 potassium channels regulate burst discharge in pyramidal cells and enable sustained high frequency firing through their ability to reduce an accumulation of low-threshold potassium current.
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Abbreviations
- CCb:
-
Corpus cerebelli
- EGp:
-
Eminentia granularis pars posterior
- ELL:
-
Electrosensory lateral line lobe
- EOD:
-
Electric organ discharge
- GC1:
-
Type-1 granule cells
- GC2:
-
Type-2 granule cells
- IKHT :
-
High-threshold potassium channel
- IKLT :
-
Low-threshold potassium channel
- JAR:
-
Jamming avoidance response
- LC:
-
Caudal lobe of cerebellum
- NADPH-d:
-
Nicotinamide adenine dinucleotide phosphate-diaphorase
- TEA:
-
Tetraethylammonium
- V 1/2 :
-
Half-activation voltage
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Acknowledgements
We gratefully acknowledge E. Morales and L. Noonan for earlier work on Kv3 channels and the expert technical assistance of M. Kruskic and M. LaChance. The work reviewed here was supported by a CIHR grant and CIHR Group Grant (RWT, RD), a CIHR Doctoral Studentship (FRF), Alberta Provincial Graduate Scholarships (FRF, WHM), and an AHFMR Scientist Award (RWT).
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W. H. Mehaffey and F. R. Fernandez contributed equally to this work.
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Mehaffey, W.H., Fernandez, F.R., Rashid, A.J. et al. Distribution and function of potassium channels in the electrosensory lateral line lobe of weakly electric apteronotid fish. J Comp Physiol A 192, 637–648 (2006). https://doi.org/10.1007/s00359-006-0103-z
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DOI: https://doi.org/10.1007/s00359-006-0103-z