The effect of a kainate GluR5 receptor antagonist on responses of spinothalamic tract neurons in a model of peripheral neuropathy in primates

J. Palecek, V. Neugebauer, S. M. Carlton, S. Iyengar, W. D. Willis

    Research output: Contribution to journalArticle

    26 Scopus citations

    Abstract

    The responses of antidromically identified spinothalamic tract (STT) neurons to mechanical and thermal stimuli were compared in anesthetized normal and neuropathic monkeys before and after administration of a GluR5 kainate receptor antagonist (LY382884) into the spinal cord dorsal horn through a microdialysis fiber. Peripheral neuropathy was induced by tight ligation of the L7 spinal nerve 13-15 days prior to the experiment. STT neurons recorded in the animals with neuropathy showed increased responsiveness to weak mechanical stimuli and to heating and cooling of the skin compared to STT cells in normal animals. In both normal and the neuropathic monkeys the responses of the STT neurons to mechanical and thermal stimuli were attenuated by LY382884 application in a concentration-dependent manner. Intraspinal application of LY382884 in the neuropathic animals led to a potent reduction of those responses of the STT neurons that were aggravated by the peripheral neuropathy (weak mechanical, heat and innocuous cooling stimuli). These results suggest that kainate receptors are involved in synaptic activation of STT cells in the normal state and may also play an important role in pathological pain states such as peripheral neuropathy in primates. Kainate receptor antagonists could thus be useful for the treatment of certain forms of allodynia and hyperalgesia.

    Original languageEnglish (US)
    Pages (from-to)151-161
    Number of pages11
    JournalPain
    Volume111
    Issue number1-2
    DOIs
    StatePublished - Sep 1 2004

      Fingerprint

    Keywords

    • Kainate receptor
    • Peripheral neuropathy
    • Primate
    • Spinothalamic tract neuron

    ASJC Scopus subject areas

    • Neurology
    • Clinical Neurology
    • Anesthesiology and Pain Medicine

    Cite this