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R Bleakman, DD Schoepp, B Ballyk, H Bufton, EF Sharpe, K Thomas, PL Ornstein and RK Kamboj
Eli Lilly and Company, Lilly Research Centre, Windlesham, Surrey, UK.
The pharmacological tools available for the discrimination of kainate receptor subtypes are limited. We examined the effects of (3S,4aR,6R,8aR)-6-[2-(1(2)H-tetrazole-5-yl)ethyl]decahydr oisoquinoline-3-carboxylic acid (LY293558) and 2,3-dihydroxy-6-nitro-7- sulfamoyl-benzo[f]quinoxaline (NBQX) on inward currents associated with activation of non-N-methyl-D-asparate (NMDA) receptors in acutely isolated rat cerebellar Purkinje neurons, rat dorsal root ganglion neurons, and human embryonic kidney 293 cells transfected with human glutamate receptors (GluR) 5 and 6. LY293558 and NBQX inhibited kainate- induced currents in cerebellar Purkinje cells, DRG neurons, and human GluR5-transfected cells. In contrast, human embryonic kidney 293 cells expressing GluR6 receptors, although blocked by NBQX, were unaffected by LY293558 at concentrations of < / = 100 microM. The selective antagonism by LY293558 of GluR5 receptors should allow the determination of the functional role of GluR5 and GluR6 in more complex systems.
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