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KCNQ/M‐currents contribute to the resting membrane potential in rat visceral sensory neurons

KCNQ/M‐currents contribute to the resting membrane potential in rat visceral sensory neurons The M‐current is a slowly activating, non‐inactivating potassium current that has been shown to be present in numerous cell types. In this study, KCNQ2, Q3 and Q5, the molecular correlates of M‐current in neurons, were identified in the visceral sensory neurons of the nodose ganglia from rats through immunocytochemical studies. All neurons showed expression of each of the three proteins. In voltage clamp studies, the cognition‐enhancing drug linopirdine (1–50 μm) and its analogue, XE991 (10 μm), quickly and irreversibly blocked a small, slowly activating current that had kinetic properties similar to KCNQ/M‐currents. This current activated between −60 and −55 mV, had a voltage‐dependent activation time constant of 208 ± 12 ms at −20 mV, a deactivation time constant of 165 ± 24 ms at −50 mV and V1/2 of −24 ± 2 mV, values which are consistent with previous reports for endogenous M‐currents. In current clamp studies, these drugs also led to a depolarization of the resting membrane potential at values as negative as −60 mV. Flupirtine (10–20 μm), an M‐current activator, caused a 3–14 mV leftward shift in the current–voltage relationship and also led to a hyperpolarization of resting membrane potential. These data indicate that the M‐current is present in nodose neurons, is activated at resting membrane potential and that it is physiologically important in regulating excitability by maintaining cells at negative voltages. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Physiology Wiley

KCNQ/M‐currents contribute to the resting membrane potential in rat visceral sensory neurons

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References (55)

Publisher
Wiley
Copyright
© 2006 The Journal of Physiology © 2006 The Physiological Society
ISSN
0022-3751
eISSN
1469-7793
DOI
10.1113/jphysiol.2006.113308
pmid
16777937
Publisher site
See Article on Publisher Site

Abstract

The M‐current is a slowly activating, non‐inactivating potassium current that has been shown to be present in numerous cell types. In this study, KCNQ2, Q3 and Q5, the molecular correlates of M‐current in neurons, were identified in the visceral sensory neurons of the nodose ganglia from rats through immunocytochemical studies. All neurons showed expression of each of the three proteins. In voltage clamp studies, the cognition‐enhancing drug linopirdine (1–50 μm) and its analogue, XE991 (10 μm), quickly and irreversibly blocked a small, slowly activating current that had kinetic properties similar to KCNQ/M‐currents. This current activated between −60 and −55 mV, had a voltage‐dependent activation time constant of 208 ± 12 ms at −20 mV, a deactivation time constant of 165 ± 24 ms at −50 mV and V1/2 of −24 ± 2 mV, values which are consistent with previous reports for endogenous M‐currents. In current clamp studies, these drugs also led to a depolarization of the resting membrane potential at values as negative as −60 mV. Flupirtine (10–20 μm), an M‐current activator, caused a 3–14 mV leftward shift in the current–voltage relationship and also led to a hyperpolarization of resting membrane potential. These data indicate that the M‐current is present in nodose neurons, is activated at resting membrane potential and that it is physiologically important in regulating excitability by maintaining cells at negative voltages.

Journal

The Journal of Physiology – Wiley

Published: Aug 15, 2006

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