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• W2034643950 abstract "1. Whole-cell patch clamp recording techniques were applied to granule cells in an in vitro salamander olfactory bulb preparation to study their morphology, membrane properties and pharmacology of postsynaptic responses to electrical stimulation of either the olfactory nerve (ON) or medial olfactory tract (MOT). Optical recordings of the same preparations stained with the voltage-sensitive dye RH414 were also made. 2. Anatomical reconstructions of biocytin-filled granule cells showed that they extend widespread spine-bearing dendrites and an axon-like process that branched within the external plexiform layer. 3. ON or MOT stimulation evoked a long-lasting depolarization, usually generating only a single action potential, in granule cells studied under standard recording conditions. Bath application of bicuculline methiodide (BMI, a GABAA receptor antagonist, 20 or 25 microM) enhanced the spontaneous and electrically evoked excitatory drive to granule cells. 4. The electrically evoked synaptic responses consisted of both excitatory and inhibitory synaptic inputs. Using symmetrical Cl- conditions inside and outside the cell to enhance Cl- currents, spontaneous and electrically driven BMI-sensitive inhibitory postsynaptic currents (IPSCs) were revealed, indicating that granule cells receive GABAergic synaptic input. 5. Bath application of GABA (250 microM to 1 mM) shunted and hyperpolarized granule cells as observed directly from whole-cell recordings and indirectly from cell-attached patch single channel recordings. 6. Bath application of the glutamate receptor antagonists 6-cyano-2,3-dihydroxy-7-nitroquinoxaline (CNQX, 10 microM) and/or DL-2-amino-5-phosphonopentanoic acid (DL-AP5, 100 microM) showed that granule cell dendrodendritic EPSPs are shaped by both non-NMDA and NMDA receptors. 7. The time course and pharmacological sensitivity of both single granule cell responses and ensemble responses recorded optically in the deeper layers of the bulb correlated well. 8. It is concluded that salamander granule cells integrate several types of synaptic input, may have both dendritic and axonal output, and play a major role in generating voltage-sensitive dye signals in the olfactory bulb." @default.
• W2034643950 created "2016-06-24" @default.
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• W2034643950 date "1994-03-15" @default.
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• W2034643950 title "GABAergic and glutamatergic synaptic input to identified granule cells in salamander olfactory bulb." @default.
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• W2034643950 doi "https://doi.org/10.1113/jphysiol.1994.sp020082" @default.
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