Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 20, Issue 18, Pages -Publisher
MDPI
DOI: 10.3390/ijms20184419
Keywords
Kv7 channel; Kv7.2/7.3 current; ethanol; SCG neuron; PI(4,5)P-2
Funding
- Basic Science Research Program of the National Research Foundation of Korea (NRF) - Ministry of Sciences and ICT [2017R1A2B4003351, 2019R1A2B5B01070546]
- Brain Research Program of the National Research Foundation of Korea (NRF) - Ministry of Sciences and ICT [NRF-2017R1A2B4003351]
- KBRI basic research program through the Korea Brain Research Institute - Ministry of Sciences and ICT [19-BR-04-03, 19-BR-04-01]
- National Research Foundation of Korea [2019R1A2B5B01070546, 2017R1A2B4003351] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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)P-2). These results suggested that ethanol and PI(4,5)P-2 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.
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