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Ethanol Elevates Excitability of Superior Cervical Ganglion Neurons by Inhibiting Kv7 Channels in a Cell Type-Specific and PI(4,5)P-2-Dependent Manner

Title
Ethanol Elevates Excitability of Superior Cervical Ganglion Neurons by Inhibiting Kv7 Channels in a Cell Type-Specific and PI(4,5)P-2-Dependent Manner
Authors
Kim, Kwon-WooKim, KeetaeLee, HyosangSuh, Byung-Chang
DGIST Authors
Kim, Keetae; Lee, HyosangSuh, Byung-Chang
Issue Date
2019-09
Citation
International Journal of Molecular Sciences, 20(18)
Type
Article
Article Type
Article
Author Keywords
Kv7 channelKv7.2/7.3 currentethanolSCG neuronPI(4,5)P-2
Keywords
SENSITIVITYACTIVATIONKCNQ2PIP2HIPPOCAMPAL INTERNEURONSSYMPATHETIC NEURONSPOTASSIUM CHANNELRATALCOHOLMODULATION
ISSN
1661-6596
Abstract
Alcohol causes diverse acute and chronic symptoms that often lead to critical health problems. Exposure to ethanol alters the activities of sympathetic neurons that control the muscles, eyes, and blood vessels in the brain. Although recent studies have revealed the cellular targets of ethanol, such as ion channels, the molecular mechanism by which alcohol modulates the excitability of sympathetic neurons has not been determined. Here, we demonstrated that ethanol increased the discharge of membrane potentials in sympathetic neurons by inhibiting the M-type or Kv7 channel consisting of the Kv7.2/7.3 subunits, which were involved in determining the membrane potential and excitability of neurons. Three types of sympathetic neurons, classified by their threshold of activation and firing patterns, displayed distinct sensitivities to ethanol, which were negatively correlated with the size of the Kv7 current that differs depending on the type of neuron. Using a heterologous expression system, we further revealed that the inhibitory effects of ethanol on Kv7.2/7.3 currents were facilitated or diminished by adjusting the amount of plasma membrane phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2). These results suggested that ethanol and PI(4,5)P2 modulated gating of the Kv7 channel in superior cervical ganglion neurons in an antagonistic manner, leading to regulation of the membrane potential and neuronal excitability, as well as the physiological functions mediated by sympathetic neurons. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.
URI
http://hdl.handle.net/20.500.11750/10841
DOI
10.3390/ijms20184419
Publisher
Multidisciplinary Digital Publishing Institute (MDPI)
Related Researcher
  • Author Lee, Hyosang Laboratory of Affective Neuroscience
  • Research Interests Neuronal circuit mechanisms underlying emotional behaviors; 정서적 행동을 매개하는 신경회로 연구
Files:
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Collection:
Department of New BiologyCBRG(Complex Biology Research Group)1. Journal Articles
Department of Brain and Cognitive SciencesLaboratory of Affective Neuroscience1. Journal Articles
Department of Brain and Cognitive SciencesLaboratory of Brain Signal and Synapse Research1. Journal Articles


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