Depression of windup of spinal neurons in the neonatal rat spinal cord in vitro by an NK3 tachykinin receptor antagonist.

@article{Barbieri2001DepressionOW,
  title={Depression of windup of spinal neurons in the neonatal rat spinal cord in vitro by an NK3 tachykinin receptor antagonist.},
  author={Mario Barbieri and Andrea Nistri},
  journal={Journal of neurophysiology},
  year={2001},
  volume={85 4},
  pages={
          1502-11
        }
}
The effects of the NK3 tachykinin receptor antagonist SR 142801 on synaptic transmission and spike windup induced by trains of stimuli applied to a dorsal root were investigated with intra- and extracellular recording from the neonatal rat spinal cord in vitro. SR 142801 (10 microM) reduced the depolarization (recorded from lumbar ventral roots) induced by senktide (an NK3 agonist) more strongly than the one evoked by substance P methyl ester (SPMeO; an NK1 agonist). Nevertheless, after a long… 

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References

SHOWING 1-10 OF 66 REFERENCES
Receptors mediating tachykinin-evoked depolarisations of neurons in the neonatal rat spinal cord.
TLDR
The contribution of NK1, NK2 and NK3 receptors to the depolarisation of the neonatal rat spinal cord in vitro evoked by exogenously applied tachykinine was examined and competitive antagonism was indicated.
Synaptic excitation of alpha-motoneurons by dorsal root afferents in the neonatal rat spinal cord.
TLDR
The results suggest that both receptor subtypes make a significant contribution to polysynaptic excitation of alpha-motoneurons by dorsal root afferents using sharp-electrode intracellular recordings of the neonatal rat.
An NK1 Receptor‐dependent Component of the Slow Excitation Recorded Intracellularly from Rat Motoneurons Following Dorsal Root Stimulation
TLDR
Evidence is obtained with a novel NK1 antagonist that a neuropeptide (presumably substance P), although not directly released by primary afferents onto motoneurons, is a neurotransmitter in the pathway mediating slow synaptic responses of motoneURons, and is presumably involved in signalling nociceptive inputs from the periphery.
Modulation of excitatory amino acid responses by tachykinins and selective tachykinin receptor agonists in the rat spinal cord
TLDR
Data show that selective agonists for the tachykinin receptors are capable of modulating EAA responses differentially, with the combined actions at NK1 and NK2 receptors biasing EAA responsiveness towards NMDA receptor mediated functions, whereas NK3 receptor activation would have the opposite effect.
NT-3 evokes an LTP-like facilitation of AMPA/kainate receptor-mediated synaptic transmission in the neonatal rat spinal cord.
TLDR
NT-3 produces synapse-specific and age-dependent LTP-like enhancement of AMPA/kainate receptor-mediated synaptic transmission in the spinal cord, and this action requires the availability of functional NMDA receptors in the motoneuron.
NK1 and NK2 receptors contribute to C‐fibre evoked slow potentials in the spinal cord
TLDR
It is demonstrated that the slowest component of the VRP is significantly reduced by both NK1 and NK2 tachykinin receptor antagonists and as a consequence, tachy Kinins have a particular contribution to the cumulative depolarization produced by low frequency C-fibre stimulation.
Modulation of monosynaptic excitation in the neonatal rat spinal cord.
1. The effects of high-frequency (5-50 Hz) stimulation of dorsal root afferents on monosynaptic excitation of alpha motoneurons was studied in the in vitro spinal cord preparation of the neonatal
...
1
2
3
4
5
...