Abstract
In the present study we tested the effects of the antihyperalgesic compound gabapentin on dorsal horn neurones in adult spinal cord. Slices were taken from control and hyperalgesic animals suffering from streptozocin-induced diabetic neuropathy. At concentrations up to 100 microM, bath application failed to affect the resting membrane properties of dorsal horn neurones taken from both groups of animal. In contrast, bath application of gabapentin dramatically reduced the magnitude of the excitatory postsynaptic current (EPSC) in neurones taken from hyperalgesic animals without altering the magnitude of the EPSC in control animals. Using a paired pulse stimulation protocol, together with analysis of miniature EPSC's, it was possible to demonstrate that gabapentin mediated these effects via a pre-synaptic site of action.
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