Abstract
Neuronal Kv7 channels underlie a voltage-gated non-inactivating potassium current known as the M-current. Due to its particular characteristics, Kv7 channels show pronounced control over the excitability of neurons. We will discuss various factors that have been shown to drastically alter the activity of this channel such as protein and phospholipid interactions, phosphorylation, calcium, and numerous neurotransmitters. Kv7 channels locate to key areas for the control of action potential initiation and propagation. Moreover, we will explore the dynamic surface expression of the channel modulated by neurotransmitters and neural activity. We will also focus on known principle functions of neural Kv7 channels: control of resting membrane potential and spiking threshold, setting the firing frequency, afterhyperpolarization after burst firing, theta resonance, and transient hyperexcitability from neurotransmitter-induced suppression of the M-current. Finally, we will discuss the contribution of altered Kv7 activity to pathologies such as epilepsy and cognitive deficits.
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Abbreviations
- PKC:
-
Protein kinase C
- PP1:
-
Protein phosphatase 1
- PP2A:
-
Protein phosphatase 2A
- AKAP:
-
A-kinase anchoring protein
- PLC:
-
Phospholipace C
- DAG:
-
Diacylglycerol
- IP3:
-
Inositol triphosphate
- PIP2:
-
Phosphatidylinositol 4,5-bis phosphate
- CaM:
-
Calmodulin
- RMP:
-
Resting membrane potential
- AIS:
-
Axon initial segment
- GSK3β:
-
Glycogen synthase kinase 3β
- CRMP-2:
-
Collapsin response mediator protein 2
- Nav:
-
Voltage-gated sodium chanel
- AHP:
-
Afterhyperpolarization
- SNARE:
-
Soluble N-ethylmaleimide-sensitive factor attachment protein receptor
- EPSPs:
-
Excitatory post-synaptic potentials
- ROS:
-
Reactive oxygen species
- BFNC:
-
Benign familial neonatal convulsions
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Greene, D.L., Hoshi, N. Modulation of Kv7 channels and excitability in the brain. Cell. Mol. Life Sci. 74, 495–508 (2017). https://doi.org/10.1007/s00018-016-2359-y
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DOI: https://doi.org/10.1007/s00018-016-2359-y