EVIDENCE THAT GYKI-52466, A NOVEL NON-NMDA ANTAGONIST ENHANCES THE DECAY OF KAINATE-INDUCED CURRENT IN CULTURED CHICKEN CORTICAL-NEURONS

The effect of a novel non-competitive non-NMDA glutamate receptor anta gonist, GYKI 52466 was studied on the glutamate agonist-induced curren ts in one month old cultured embryonal chicken brain neurons by a whol e cell patch-clamp technique. AMPA, applied in different concentration s (30-1000 mu M) did not evoke any current. Kainate evoked an increase of steady-state current (KA-current). NMDA induced a current with 5-1 0 times higher peak amplitude than KA, but GYKI 52466 failed to affect this current. It reduced the amplitude of KA-current in a concentrati on-dependent (1-100 mu M) manner, and produced a slow decay of it. The IC50 value of GYKI 52466 against 100 mu M KA was 20.4 +/- 6.4 mu M wi th a Hill coefficient of 1.12. The inhibition of KA-currents was volta ge-dependent with greater inhibition between -110 to -40 mV than betwe en -30 and +60 mV. In order to compare the effect of GYKI 52466 with a well-known competitive non-NMDA antagonist, we also studied the effec t of the quinoxalinedione CNQX. When GYKI 52466 and CNQX were applied together there was only a small additive effect. Our results with GYKI 52466 on glutamate agonist-induced currents in embryonic chicken cort ical neurons are similar to those observed in rat hippocampal neurons.