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Related Experiment Videos

GABA-B receptor-mediated spinal inhibition

D R Curtis1, G Lacey

  • 1Division of Neuroscience, John Curtin School of Medical Research, Canberra, Australia.

Neuroreport
|January 31, 1994
PubMed
Summary

GABA-B antagonists block a long-lasting inhibition in cat reflexes. This suggests GABA-B receptors are involved in this specific neural inhibitory process.

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Prolonged GABA(B) receptor-mediated synaptic inhibition in the cat spinal cord: an in vivo study.

Experimental brain research·1998

Area of Science:

  • Neuroscience
  • Pharmacology

Background:

  • Neuronal inhibition is crucial for motor control.
  • GABA-A receptors mediate fast inhibitory neurotransmission.
  • The role of GABA-B receptors in spinal reflexes is less understood.

Purpose of the Study:

  • To investigate the role of GABA-B receptors in the inhibition of lumbar extensor monosynaptic reflexes.
  • To differentiate the contribution of GABA-B receptors from GABA-A receptors in spinal reflex modulation.

Main Methods:

  • Intravenous administration of GABA-B antagonists (CGP 46381, CGP 35348) in pentobarbitone-anaesthetized cats.
  • Tetanic stimulation of low threshold flexor primary afferent fibres.
  • Measurement of lumbar extensor monosynaptic reflexes.

Main Results:

  • GABA-B antagonists CGP 46381 and CGP 35348 selectively blocked the longer duration component of reflex inhibition.
  • This inhibition is distinct from the shorter duration, bicuculline-sensitive GABA-A mediated inhibition.
  • GABA-B receptors are associated with a specific, long-lasting inhibitory process in spinal reflexes.

Conclusions:

  • GABA-B receptors play a significant role in modulating spinal reflexes.
  • These receptors contribute to a distinct inhibitory pathway separate from GABA-A mediated presynaptic inhibition.
  • Understanding GABA-B receptor function offers insights into neural control of movement.

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