Identification of ATP-sensitive K+ conductances in male rat major pelvic ganglion neurons

Kyu Sang Park, Seung Kyu Cha, Keon Il Lee, Jae Yeoul Jun, Seong Woo Jeong, In Deok Kong, Joong Woo Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Major pelvic ganglia (MPG) neurons are classified into sympathetic and parasympathetic neurons according to the electrophysiological properties; membrane capacitance (Cm), expression of T-type Ca2+ channels, and the firing patterns during depolarization. In the present study, function and molecular expression of ATP-sensitive K+ (KATP) channels was investigated in MPG neurons of male rats. Only in parasympathetic MPG neurons showing phasic firing patterns, hyperpolarizing changes were elicited by the application of diazoxide, an activator of KATP channels. Glibenclamide (10 μM), a KATP channel blocker, completely abolished the diazoxide-induced hyperpolarization. Diazoxide increased inward currents at high K+ (90 mM) external solution, which was also blocked by glibenclamide. The metabolic inhibition by the treatment with mitochondrial respiratory chain inhibitors (rotenone and antimycin) hyperpolarized the resting membrane potential of parasympathetic neurons, which was not observed in sympathetic neurons. The hyperpolarizing response to metabolic inhibition was partially blocked by glibenclamide. RT-PCR analysis revealed that MPG neurons mainly expressed the KATP channel subunits of Kir6.2 and SUR1. Our results suggest that MPG neurons have KATP channels, mainly formed by Kir6.2 and SUR1, with phenotype-specificity, and that the conductance through this channel in parasympathetic neurons may contribute to the changes in excitability during hypoxia and/or metabolic inhibition.

Original languageEnglish
Pages (from-to)247-253
Number of pages7
JournalKorean Journal of Physiology and Pharmacology
Volume6
Issue number5
Publication statusPublished - 2002 Oct 1

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Ganglia
Adenosine Triphosphate
KATP Channels
Neurons
Diazoxide
Glyburide
Rotenone
Electron Transport
Membrane Potentials
Phenotype
Polymerase Chain Reaction
Membranes

All Science Journal Classification (ASJC) codes

  • Physiology
  • Pharmacology

Cite this

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abstract = "Major pelvic ganglia (MPG) neurons are classified into sympathetic and parasympathetic neurons according to the electrophysiological properties; membrane capacitance (Cm), expression of T-type Ca2+ channels, and the firing patterns during depolarization. In the present study, function and molecular expression of ATP-sensitive K+ (KATP) channels was investigated in MPG neurons of male rats. Only in parasympathetic MPG neurons showing phasic firing patterns, hyperpolarizing changes were elicited by the application of diazoxide, an activator of KATP channels. Glibenclamide (10 μM), a KATP channel blocker, completely abolished the diazoxide-induced hyperpolarization. Diazoxide increased inward currents at high K+ (90 mM) external solution, which was also blocked by glibenclamide. The metabolic inhibition by the treatment with mitochondrial respiratory chain inhibitors (rotenone and antimycin) hyperpolarized the resting membrane potential of parasympathetic neurons, which was not observed in sympathetic neurons. The hyperpolarizing response to metabolic inhibition was partially blocked by glibenclamide. RT-PCR analysis revealed that MPG neurons mainly expressed the KATP channel subunits of Kir6.2 and SUR1. Our results suggest that MPG neurons have KATP channels, mainly formed by Kir6.2 and SUR1, with phenotype-specificity, and that the conductance through this channel in parasympathetic neurons may contribute to the changes in excitability during hypoxia and/or metabolic inhibition.",
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Identification of ATP-sensitive K+ conductances in male rat major pelvic ganglion neurons. / Park, Kyu Sang; Cha, Seung Kyu; Lee, Keon Il; Jun, Jae Yeoul; Jeong, Seong Woo; Kong, In Deok; Lee, Joong Woo.

In: Korean Journal of Physiology and Pharmacology, Vol. 6, No. 5, 01.10.2002, p. 247-253.

Research output: Contribution to journalArticle

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AU - Park, Kyu Sang

AU - Cha, Seung Kyu

AU - Lee, Keon Il

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AU - Kong, In Deok

AU - Lee, Joong Woo

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