Electrophysiological Evidence for Multiple Glycinergic Inputs to Neonatal Rat Sympathetic Preganglionic NeuronsIn Vitro
| Autor: | Paul Feltz, Angélique Bordey, Johannes Krupp |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Sympathetic nervous system
Patch-Clamp Techniques Sympathetic Nervous System Autonomic Fibers Preganglionic Glycine In Vitro Techniques Biology Neurotransmission Inhibitory postsynaptic potential Synaptic Transmission Excitatory Amino Acid Agonists medicine Animals Nicotinic Agonists Glycine receptor Neurons General Neuroscience Glutamate receptor Rats Electrophysiology medicine.anatomical_structure Nicotinic agonist Animals Newborn Spinal Cord Biophysics Neuroscience Acetylcholine medicine.drug |
| Zdroj: | European Journal of Neuroscience. 9:1711-1719 |
| ISSN: | 0953-816X |
| DOI: | 10.1111/j.1460-9568.1997.tb01528.x |
| Popis: | The time pattern of glycinergic inhibitory postsynaptic currents (IPSCs) in sympathetic preganglionic neurons was studied in thin transverse spinal cord slices of neonatal (1-10 days postnatal) rats by means of the patchclamp technique. Three time patterns could be distinguished: (i) large events [mostly > 400 pA (30-36 degrees C)] occurring at regular intervals, (ii) small events occurring at irregular intervals, and (iii) small events occurring in transient (1.5-10 s), high-frequency (> 15 Hz) bursts of synaptic activity. The large regular events had uniform kinetics which was consistent with the idea of a proximal site of origin for all of these events. They were reversibly inhibited in amplitude and frequency by extracellular application of a high concentration of acetylcholine (200 microM) or the specific nicotinic acetylcholine receptor agonist dimethylphenylpiperazinium iodide (DMPP; 1 mM), but unaffected by glutamate (100 microM). IPSCs occurring in bursts had slower and less uniform kinetics, suggesting a more diverse site of origin. The frequency of events decreased during a burst. Similar bursts could be induced by extracellular application of glutamate receptor agonists. These results indicate that sympathetic pregnanglionic neurons in a thin, transverse spinal cord slice receive at least two different glycinergic inputs. |
| Databáze: | OpenAIRE |
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