Hippocampal A-type current and Kv4.2 channel modulation by the sulfonylurea compound NS5806.
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Hippocampal A-type current and Kv4.2 channel modulation by the sulfonylurea compound NS5806. / Witzel, Katrin; Fischer, Paul; Bähring, Robert.
In: NEUROPHARMACOLOGY, Vol. 63, No. 8, 8, 2012, p. 1389-1403.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Hippocampal A-type current and Kv4.2 channel modulation by the sulfonylurea compound NS5806.
AU - Witzel, Katrin
AU - Fischer, Paul
AU - Bähring, Robert
PY - 2012
Y1 - 2012
N2 - We examined the effects of the sulfonylurea compound NS5806 on neuronal A-type channel function. Using whole-cell patch-clamp we studied the effects of NS5806 on the somatodendritic A-type current (I(SA)) in cultured hippocampal neurons and the currents mediated by Kv4.2 channels coexpressed with different auxiliary ?-subunits, including both Kv channel interacting proteins (KChIPs) and dipeptidyl aminopeptidase-related proteins (DPPs), in HEK 293 cells. The amplitude of the I(SA) component in hippocampal neurons was reduced in the presence of 20 ?M NS5806. I(SA) decay kinetics were slowed and the recovery kinetics accelerated, but the voltage dependence of steady-state inactivation was shifted to more negative potentials by NS5806. The peak amplitudes of currents mediated by ternary Kv4.2 channel complexes, associated with DPP6-S (short splice-variant) and either KChIP2, KChIP3 or KChIP4, were potentiated and their macroscopic inactivation slowed by NS5806, whereas the currents mediated by binary Kv4.2 channels, associated only with DPP6-S, were suppressed, and the NS5806-mediated slowing of macroscopic inactivation was less pronounced. Neither potentiation nor suppression and no effect on current decay kinetics in the presence of NS5806 were observed for Kv4.2 channels associated with KChIP3 and the N-type inactivation-conferring DPP6a splice-variant. For all recombinant channel complexes, NS5806 slowed the recovery from inactivation and shifted the voltage dependence of steady-state inactivation to more negative potentials. Our results demonstrate the activity of NS5806 on native I(SA) and possible molecular correlates in the form of recombinant Kv4.2 channels complexed with different KChIPs and DPPs, and they shed some light on the mechanism of NS5806 action.
AB - We examined the effects of the sulfonylurea compound NS5806 on neuronal A-type channel function. Using whole-cell patch-clamp we studied the effects of NS5806 on the somatodendritic A-type current (I(SA)) in cultured hippocampal neurons and the currents mediated by Kv4.2 channels coexpressed with different auxiliary ?-subunits, including both Kv channel interacting proteins (KChIPs) and dipeptidyl aminopeptidase-related proteins (DPPs), in HEK 293 cells. The amplitude of the I(SA) component in hippocampal neurons was reduced in the presence of 20 ?M NS5806. I(SA) decay kinetics were slowed and the recovery kinetics accelerated, but the voltage dependence of steady-state inactivation was shifted to more negative potentials by NS5806. The peak amplitudes of currents mediated by ternary Kv4.2 channel complexes, associated with DPP6-S (short splice-variant) and either KChIP2, KChIP3 or KChIP4, were potentiated and their macroscopic inactivation slowed by NS5806, whereas the currents mediated by binary Kv4.2 channels, associated only with DPP6-S, were suppressed, and the NS5806-mediated slowing of macroscopic inactivation was less pronounced. Neither potentiation nor suppression and no effect on current decay kinetics in the presence of NS5806 were observed for Kv4.2 channels associated with KChIP3 and the N-type inactivation-conferring DPP6a splice-variant. For all recombinant channel complexes, NS5806 slowed the recovery from inactivation and shifted the voltage dependence of steady-state inactivation to more negative potentials. Our results demonstrate the activity of NS5806 on native I(SA) and possible molecular correlates in the form of recombinant Kv4.2 channels complexed with different KChIPs and DPPs, and they shed some light on the mechanism of NS5806 action.
KW - Animals
KW - Humans
KW - Cells, Cultured
KW - Kinetics
KW - Rats
KW - Data Interpretation, Statistical
KW - Rats, Wistar
KW - Patch-Clamp Techniques
KW - HEK293 Cells
KW - Phenylurea Compounds/pharmacology
KW - Hippocampus/drug effects/metabolism
KW - Dipeptidyl-Peptidases and Tripeptidyl-Peptidases/drug effects/metabolism/physiology
KW - Kv Channel-Interacting Proteins/physiology
KW - Neurons/drug effects/metabolism
KW - Potassium Channel Blockers/pharmacology
KW - Shal Potassium Channels/drug effects
KW - Tetrazoles/pharmacology
KW - Animals
KW - Humans
KW - Cells, Cultured
KW - Kinetics
KW - Rats
KW - Data Interpretation, Statistical
KW - Rats, Wistar
KW - Patch-Clamp Techniques
KW - HEK293 Cells
KW - Phenylurea Compounds/pharmacology
KW - Hippocampus/drug effects/metabolism
KW - Dipeptidyl-Peptidases and Tripeptidyl-Peptidases/drug effects/metabolism/physiology
KW - Kv Channel-Interacting Proteins/physiology
KW - Neurons/drug effects/metabolism
KW - Potassium Channel Blockers/pharmacology
KW - Shal Potassium Channels/drug effects
KW - Tetrazoles/pharmacology
M3 - SCORING: Journal article
VL - 63
SP - 1389
EP - 1403
JO - NEUROPHARMACOLOGY
JF - NEUROPHARMACOLOGY
SN - 0028-3908
IS - 8
M1 - 8
ER -
