The Nav1.2 channel is regulated by GSK3

Thomas F. James, Miroslav N. Nenov, Norelle C. Wildburger, Cheryl F. Lichti, Jonathan Luisi, Fernanda Vergara, Neli I. Panova-Electronova, Carol L. Nilsson, Jai S. Rudra, Thomas Green, Demetrio Labate, Fernanda Laezza

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Background Phosphorylation plays an essential role in regulating voltage-gated sodium (Nav) channels and excitability. Yet, a surprisingly limited number of kinases have been identified as regulators of Nav channels. We posited that glycogen synthase kinase 3 (GSK3), a critical kinase found associated with numerous brain disorders, might directly regulate neuronal Nav channels. Methods We used patch-clamp electrophysiology to record sodium currents from Nav1.2 channels stably expressed in HEK-293 cells. mRNA and protein levels were quantified with RT-PCR, Western blot, or confocal microscopy, and in vitro phosphorylation and mass spectrometry to identify phosphorylated residues. Results We found that exposure of cells to GSK3 inhibitor XIII significantly potentiates the peak current density of Nav1.2, a phenotype reproduced by silencing GSK3 with siRNA. Contrarily, overexpression of GSK3β suppressed Nav1.2-encoded currents. Neither mRNA nor total protein expression was changed upon GSK3 inhibition. Cell surface labeling of CD4-chimeric constructs expressing intracellular domains of the Nav1.2 channel indicates that cell surface expression of CD4-Nav1.2 C-tail was up-regulated upon pharmacological inhibition of GSK3, resulting in an increase of surface puncta at the plasma membrane. Finally, using in vitro phosphorylation in combination with high resolution mass spectrometry, we further demonstrate that GSK3β phosphorylates T1966 at the C-terminal tail of Nav1.2. Conclusion These findings provide evidence for a new mechanism by which GSK3 modulates Nav channel function via its C-terminal tail. General significance These findings provide fundamental knowledge in understanding signaling dysfunction common in several neuropsychiatric disorders.

Original languageEnglish (US)
Pages (from-to)832-844
Number of pages13
JournalBiochimica et Biophysica Acta - General Subjects
Volume1850
Issue number4
DOIs
StatePublished - 2015
Externally publishedYes

Fingerprint

Glycogen Synthase Kinase 3
Phosphorylation
Mass spectrometry
Mass Spectrometry
Phosphotransferases
Voltage-Gated Sodium Channels
Electrophysiology
Messenger RNA
Confocal microscopy
HEK293 Cells
Clamping devices
Brain Diseases
Cell membranes
Confocal Microscopy
Labeling
Small Interfering RNA
Brain
Proteins
Current density
Western Blotting

Keywords

  • Confocal microscopy
  • Glycogen synthase kinase 3
  • Patch-clamp electrophysiology
  • Protein-protein interactions
  • Sodium channel

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

The Nav1.2 channel is regulated by GSK3. / James, Thomas F.; Nenov, Miroslav N.; Wildburger, Norelle C.; Lichti, Cheryl F.; Luisi, Jonathan; Vergara, Fernanda; Panova-Electronova, Neli I.; Nilsson, Carol L.; Rudra, Jai S.; Green, Thomas; Labate, Demetrio; Laezza, Fernanda.

In: Biochimica et Biophysica Acta - General Subjects, Vol. 1850, No. 4, 2015, p. 832-844.

Research output: Contribution to journalArticle

James, TF, Nenov, MN, Wildburger, NC, Lichti, CF, Luisi, J, Vergara, F, Panova-Electronova, NI, Nilsson, CL, Rudra, JS, Green, T, Labate, D & Laezza, F 2015, 'The Nav1.2 channel is regulated by GSK3', Biochimica et Biophysica Acta - General Subjects, vol. 1850, no. 4, pp. 832-844. https://doi.org/10.1016/j.bbagen.2015.01.011
James, Thomas F. ; Nenov, Miroslav N. ; Wildburger, Norelle C. ; Lichti, Cheryl F. ; Luisi, Jonathan ; Vergara, Fernanda ; Panova-Electronova, Neli I. ; Nilsson, Carol L. ; Rudra, Jai S. ; Green, Thomas ; Labate, Demetrio ; Laezza, Fernanda. / The Nav1.2 channel is regulated by GSK3. In: Biochimica et Biophysica Acta - General Subjects. 2015 ; Vol. 1850, No. 4. pp. 832-844.
@article{95b860a92c994a79b3b37f504e33c106,
title = "The Nav1.2 channel is regulated by GSK3",
abstract = "Background Phosphorylation plays an essential role in regulating voltage-gated sodium (Nav) channels and excitability. Yet, a surprisingly limited number of kinases have been identified as regulators of Nav channels. We posited that glycogen synthase kinase 3 (GSK3), a critical kinase found associated with numerous brain disorders, might directly regulate neuronal Nav channels. Methods We used patch-clamp electrophysiology to record sodium currents from Nav1.2 channels stably expressed in HEK-293 cells. mRNA and protein levels were quantified with RT-PCR, Western blot, or confocal microscopy, and in vitro phosphorylation and mass spectrometry to identify phosphorylated residues. Results We found that exposure of cells to GSK3 inhibitor XIII significantly potentiates the peak current density of Nav1.2, a phenotype reproduced by silencing GSK3 with siRNA. Contrarily, overexpression of GSK3β suppressed Nav1.2-encoded currents. Neither mRNA nor total protein expression was changed upon GSK3 inhibition. Cell surface labeling of CD4-chimeric constructs expressing intracellular domains of the Nav1.2 channel indicates that cell surface expression of CD4-Nav1.2 C-tail was up-regulated upon pharmacological inhibition of GSK3, resulting in an increase of surface puncta at the plasma membrane. Finally, using in vitro phosphorylation in combination with high resolution mass spectrometry, we further demonstrate that GSK3β phosphorylates T1966 at the C-terminal tail of Nav1.2. Conclusion These findings provide evidence for a new mechanism by which GSK3 modulates Nav channel function via its C-terminal tail. General significance These findings provide fundamental knowledge in understanding signaling dysfunction common in several neuropsychiatric disorders.",
keywords = "Confocal microscopy, Glycogen synthase kinase 3, Patch-clamp electrophysiology, Protein-protein interactions, Sodium channel",
author = "James, {Thomas F.} and Nenov, {Miroslav N.} and Wildburger, {Norelle C.} and Lichti, {Cheryl F.} and Jonathan Luisi and Fernanda Vergara and Panova-Electronova, {Neli I.} and Nilsson, {Carol L.} and Rudra, {Jai S.} and Thomas Green and Demetrio Labate and Fernanda Laezza",
year = "2015",
doi = "10.1016/j.bbagen.2015.01.011",
language = "English (US)",
volume = "1850",
pages = "832--844",
journal = "Biochimica et Biophysica Acta - General Subjects",
issn = "0304-4165",
publisher = "Elsevier",
number = "4",

}

TY - JOUR

T1 - The Nav1.2 channel is regulated by GSK3

AU - James, Thomas F.

AU - Nenov, Miroslav N.

AU - Wildburger, Norelle C.

AU - Lichti, Cheryl F.

AU - Luisi, Jonathan

AU - Vergara, Fernanda

AU - Panova-Electronova, Neli I.

AU - Nilsson, Carol L.

AU - Rudra, Jai S.

AU - Green, Thomas

AU - Labate, Demetrio

AU - Laezza, Fernanda

PY - 2015

Y1 - 2015

N2 - Background Phosphorylation plays an essential role in regulating voltage-gated sodium (Nav) channels and excitability. Yet, a surprisingly limited number of kinases have been identified as regulators of Nav channels. We posited that glycogen synthase kinase 3 (GSK3), a critical kinase found associated with numerous brain disorders, might directly regulate neuronal Nav channels. Methods We used patch-clamp electrophysiology to record sodium currents from Nav1.2 channels stably expressed in HEK-293 cells. mRNA and protein levels were quantified with RT-PCR, Western blot, or confocal microscopy, and in vitro phosphorylation and mass spectrometry to identify phosphorylated residues. Results We found that exposure of cells to GSK3 inhibitor XIII significantly potentiates the peak current density of Nav1.2, a phenotype reproduced by silencing GSK3 with siRNA. Contrarily, overexpression of GSK3β suppressed Nav1.2-encoded currents. Neither mRNA nor total protein expression was changed upon GSK3 inhibition. Cell surface labeling of CD4-chimeric constructs expressing intracellular domains of the Nav1.2 channel indicates that cell surface expression of CD4-Nav1.2 C-tail was up-regulated upon pharmacological inhibition of GSK3, resulting in an increase of surface puncta at the plasma membrane. Finally, using in vitro phosphorylation in combination with high resolution mass spectrometry, we further demonstrate that GSK3β phosphorylates T1966 at the C-terminal tail of Nav1.2. Conclusion These findings provide evidence for a new mechanism by which GSK3 modulates Nav channel function via its C-terminal tail. General significance These findings provide fundamental knowledge in understanding signaling dysfunction common in several neuropsychiatric disorders.

AB - Background Phosphorylation plays an essential role in regulating voltage-gated sodium (Nav) channels and excitability. Yet, a surprisingly limited number of kinases have been identified as regulators of Nav channels. We posited that glycogen synthase kinase 3 (GSK3), a critical kinase found associated with numerous brain disorders, might directly regulate neuronal Nav channels. Methods We used patch-clamp electrophysiology to record sodium currents from Nav1.2 channels stably expressed in HEK-293 cells. mRNA and protein levels were quantified with RT-PCR, Western blot, or confocal microscopy, and in vitro phosphorylation and mass spectrometry to identify phosphorylated residues. Results We found that exposure of cells to GSK3 inhibitor XIII significantly potentiates the peak current density of Nav1.2, a phenotype reproduced by silencing GSK3 with siRNA. Contrarily, overexpression of GSK3β suppressed Nav1.2-encoded currents. Neither mRNA nor total protein expression was changed upon GSK3 inhibition. Cell surface labeling of CD4-chimeric constructs expressing intracellular domains of the Nav1.2 channel indicates that cell surface expression of CD4-Nav1.2 C-tail was up-regulated upon pharmacological inhibition of GSK3, resulting in an increase of surface puncta at the plasma membrane. Finally, using in vitro phosphorylation in combination with high resolution mass spectrometry, we further demonstrate that GSK3β phosphorylates T1966 at the C-terminal tail of Nav1.2. Conclusion These findings provide evidence for a new mechanism by which GSK3 modulates Nav channel function via its C-terminal tail. General significance These findings provide fundamental knowledge in understanding signaling dysfunction common in several neuropsychiatric disorders.

KW - Confocal microscopy

KW - Glycogen synthase kinase 3

KW - Patch-clamp electrophysiology

KW - Protein-protein interactions

KW - Sodium channel

UR - http://www.scopus.com/inward/record.url?scp=84922289434&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84922289434&partnerID=8YFLogxK

U2 - 10.1016/j.bbagen.2015.01.011

DO - 10.1016/j.bbagen.2015.01.011

M3 - Article

VL - 1850

SP - 832

EP - 844

JO - Biochimica et Biophysica Acta - General Subjects

JF - Biochimica et Biophysica Acta - General Subjects

SN - 0304-4165

IS - 4

ER -