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1 Laboratory for Neuronal Circuit Dynamics, RIKEN Brain Science Institute, Wako-shi, Saitama, Japan
* To whom correspondence should be addressed. E-mail: tknopfel{at}brain.riken.jp.
Fast synaptic transmission between olfactory receptor neurons and mitral cells (MCs) is mediated through AMPA and NMDA ionotropic glutamate receptors. MCs also express high levels of metabotropic glutamate receptor 1 (mGluR1) whose functional significance is less understood. Here we characterized a slow mGluR1-mediated potential that was evoked by high frequency (100Hz) olfactory nerve (ON) stimulation in the presence of NBQX and D-APV, blockers of ionotropic glutamate receptors, and that was associated with a local Ca2+ transient in the MC dendritic tuft. High-frequency ON stimulation in the presence of NBQX and D-APV also evoked a slow ~2Hz oscillation of MC membrane potential which was abolished by the mGluR1 antagonist LY367385 (50µM). Both mGluR slow potential and slow oscillation persisted in the presence of gabazine (10µM), a GABAA receptor antagonist, and intracellular QX-314 (10mM), a Na+ channel blocker. In contrast to a slow mGluR1 potential in cerebellar Purkinje neurons, the MC mGluR1 potential was not depressed by SKF96365 (up to 250 µM) and thus, is likely not mediated by TRPC1 cation channels, nor was it potentiated by an elevation of intracellular Ca2+ level. Imaging with the Na+ indicator SBFI revealed a Na+ transient in the MC dendrite accompanying the mGluR1 slow potential. We conclude that the MC mGluR1 potential triggered by glutamate released from the ON supports oscillations and synchronizations of MCs associated within one glomerulus.
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