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• W2033729250 abstract "Functional interaction between ionotropic and metabotropic glutamate receptors (iGluR and mGluR respectively) was studied in cerebellar granule cell cultures using quisqualate (QA), the most potent agonist of phosphoinositide hydrolysis coupled mGluR, and N-methyl-D-aspartate (NMDA) or kainate (KA) that activate different classes of iGluR. Two h exposure to NMDA or KA resulted in a marked reduction (about 75%) of QA-evoked PI hydrolysis. The efficacy of the two agonists was about the same, but the potencies were different (IC50 for NMDA about 35 microM and for KA about 70 microM). NMDA-induced depression of QA-stimulated PI hydrolysis was relatively long lasting but reversible. Recovery required protein synthesis. In nominally Ca2+-free medium both NMDA and KA failed to attenuate QA-stimulated PI hydrolysis. The effect of NMDA was prevented by the NMDA receptor antagonist MK801, but not by the wide spectrum protein kinase inhibitor staurosporin nor by the nitric oxide synthase inhibitor N omega-nitro-L-arginine. Cycloheximide and concanavalin A were also ineffective. The effect of KA was prevented by the selective non-NMDA receptor antagonist 2,3-dihydroxy-6-nitro-7-sulfamoyl-benzo(F)quinoxaline (NBQX). Voltage sensitive Ca2+ channel antagonists together with MK801 did not counteract the inhibition by KA of the QA response. Both NMDA and KA attenuated PI hydrolysis evoked by the muscarinic receptor agonist carbachol (about 30%), indicating that the activation of iGluRs exerts a relatively general inhibitory effect on the function of different PLC-coupled metabotropic receptors. Consistent with this observation is that treatments either with KA and NMDA induced an inhibition (about 30%) of NaF-stimulated PI hydrolysis which occurs through the direct activation of G proteins. Our observations show that ionotropic glutamate receptor stimulation induces a long lasting suppression of QA-evoked PI breakdown through a Ca2+ dependent mechanism which seems to involve receptor coupled transduction systems downstream from mGluR. Such a Ca2+-dependent cross-talk involving ionotropic and metabotropic receptors may play a role in certain events of synaptic plasticity." @default.
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• W2033729250 date "1998-09-01" @default.
• W2033729250 modified "2023-10-02" @default.
• W2033729250 title "Calcium influx via ionotropic glutamate receptors causes long lasting inhibition of metabotropic glutamate receptor-coupled phosphoinositide hydrolysis" @default.
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• W2033729250 doi "https://doi.org/10.1016/s0197-0186(98)00030-8" @default.
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