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Gabapentin Modulates HCN4 Channel Voltage-Dependence.

Han-Shen Tae1, Kelly M Smith2,3, A Marie Phillips1,4

  • 1Florey Institute of Neuroscience and Mental Health, The University of Melbourne, ParkvilleVIC, Australia.

Frontiers in Pharmacology
|September 6, 2017
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Gabapentin directly modulates HCN4 channels, reducing their currents by shifting voltage activation. This discovery offers a new molecular target for gabapentin

Keywords:
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Area of Science:

  • Neuroscience
  • Pharmacology
  • Channelopathies

Background:

  • Gabapentin (GBP) is a common medication for epilepsy and neuropathic pain.
  • Previous studies suggest GBP may affect hyperpolarization-activated cation (HCN) channels, but direct evidence is limited.
  • HCN channels mediate the Ih current crucial for neuronal excitability.

Purpose of the Study:

  • To investigate the direct effects of gabapentin on human HCN channel subtypes (HCN1, HCN2, HCN4).
  • To determine if gabapentin modulates Ih in specific inhibitory neuron populations in the mouse spinal cord.
  • To explore HCN4 as a potential molecular target for gabapentin's therapeutic actions.

Main Methods:

  • Two-electrode voltage clamp recordings from Xenopus oocytes expressing human HCN1, HCN2, and HCN4 channels.
  • Whole-cell patch-clamp recordings from mouse spinal cord slices, targeting parvalbumin-positive (PV+) and calretinin-positive (CR+) inhibitory neurons.
  • Immunohistochemistry to assess HCN4 expression in spinal cord neurons.

Main Results:

  • Gabapentin (100 microM) caused a hyperpolarizing shift in the voltage of half activation (V1/2) for HCN4 channels, reducing currents.
  • Gabapentin did not significantly affect the V1/2 of HCN1 or HCN2 channels.
  • Gabapentin reduced Ih in HCN4-expressing PV+ neurons but had minimal effect on CR+ neurons, correlating with HCN4 expression patterns.

Conclusions:

  • Gabapentin selectively reduces HCN4 channel-mediated currents by altering voltage-dependent activation.
  • The subtype selectivity of gabapentin on HCN channels provides a tool for studying HCN4 function in the CNS.
  • HCN4 channels are identified as a potential molecular target for gabapentin's analgesic and anticonvulsant effects.