Effect of metabotropic glutamate receptor activity on rhythmic discharges of the neonatal rat spinal cord in vitro
| Autor: | Giuliano Taccola, Andrea Nistri, Cristina Marchetti |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Agonist
Periodicity Serotonin locomotor network fictive locomotion disinhibited bursting spinal network glutamate receptors oscillations N-Methylaspartate Calcium Channels L-Type medicine.drug_class Action Potentials Down-Regulation Bicuculline Receptors Metabotropic Glutamate Bursting Biological Clocks Excitatory Amino Acid Agonists medicine Animals Rats Wistar 5-HT receptor Motor Neurons Chemistry General Neuroscience Glutamate receptor Strychnine Calcium Channel Blockers Rats Metabotropic receptor Animals Newborn Spinal Cord nervous system Metabotropic glutamate receptor NMDA receptor Nerve Net Excitatory Amino Acid Antagonists Neuroscience Locomotion medicine.drug |
| Zdroj: | Experimental Brain Research. 153:388-393 |
| ISSN: | 1432-1106 0014-4819 |
| DOI: | 10.1007/s00221-003-1668-1 |
| Popis: | To extend our understanding of the network-based properties which enable a neuronal circuit to produce sustained electrical oscillations, we explored the potential contribution of metabotropic glutamate receptors (mGluRs) to generation of rhythmic discharges. The in vitro spinal cord of the neonatal rat was used as a model to find out if electrical patterns characterized by either alternating or synchronous motor pool discharges (recorded from lumbar ventral roots) required mGluR activation or were modulated by it. Alternating patterns of fictive locomotion (induced by NMDA and 5HT) were slowed down and blocked by the broad spectrum mGluR agonist (+/-)-1-aminocyclopentane-trans-1, 3-dicarboxylic acid (t-ACPD; 5-50 microM) and unaffected by the broad spectrum mGluR antagonist (RS)-alpha-methyl-4-carboxyphenylglycine (MCPG; 1 mM). The regular, synchronous bursting emerging in the presence of strychnine and bicuculline was accelerated by t-ACPD with a commensurate decrease in single burst length, an effect antagonized by MCPG which per se did not affect bursting. The action of t-ACPD was selectively inhibited by the L-type Ca2+ blocker nifedipine which, however, did not change rhythm acceleration evoked by NMDA. These data suggest that neither alternating nor synchronous oscillatory discharges were apparently dependent on mGluR activation via endogenously released glutamate. However, mGluR activation by the agonist t-ACPD modulated rhythmic patterns, indicating that such receptors are a potential target for pharmacological up- or downregulation of spinal rhythmicity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink