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Gabapentin increases the hyperpolarization-activated cation current Ih in rat CA1 pyramidal cells
Rainer Surges1, Thomas M Freiman, Thomas J Feuerstein
1Department of Neurology, Section of Clinical Neuropharmacology, Neurozentrum, University of Freiburg, Germany. surges@nz.ukl.uni-freiburg.de
Epilepsia
|February 1, 2003
Summary
Gabapentin (GBP) enhances neuronal Ih current in a concentration-dependent manner. This effect, observed in rat hippocampus, may explain gabapentin's anticonvulsant action in partial seizures.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Gabapentin (GBP) is widely used for partial seizures, but its mechanism remains unclear.
- Neuronal intrinsic membrane properties, particularly the Ih current, are crucial in temporal lobe epilepsy genesis.
Purpose of the Study:
- To investigate the effects of gabapentin (GBP) on the Ih current.
- To explore the potential contribution of Ih modulation to GBP's anticonvulsant activity.
Main Methods:
- Whole-cell patch-clamp technique was used to record from CA1 pyramidal cells in rat hippocampal slices.
Main Results:
- Gabapentin (GBP) dose-dependently increased Ih amplitude by enhancing conductance.
- Effects were observed at clinically relevant concentrations (50-100 microM).
- Gabapentin's effect on Ih was independent of intracellular cyclic adenosine monophosphate (cAMP).
Conclusions:
- Gabapentin increases Ih via a cAMP-independent pathway.
- This modulation of Ih may contribute to gabapentin's anticonvulsant effects in partial seizures.
- The findings suggest a novel mechanism for gabapentin's action.