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Related Experiment Videos

Extrinsic modulation and motor pattern generation in a feeding network: a cellular study.

V A Straub1, P R Benjamin

  • 1Sussex Centre for Neuroscience, University of Sussex, Falmer, Brighton, BN1 9QG, United Kingdom. V.Straub@sussex.ac.uk

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 27, 2001
PubMed
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The cerebral giant cells (CGCs) in snails modulate feeding circuits by releasing serotonin (5-HT). This study reveals how 5-HT alters neuron properties, controlling feeding motor patterns at a cellular level.

Area of Science:

  • Neuroscience
  • Cellular Biology
  • Molluscan Physiology

Background:

  • Gastropod mollusks utilize cerebral giant cells (CGCs) for extrinsic modulation of feeding central pattern generators (CPGs).
  • Serotonin (5-HT) is a key neurotransmitter released by CGCs, influencing CPG activity.

Purpose of the Study:

  • To investigate the cellular-level modulatory actions of CGCs and 5-HT on feeding CPG neurons.
  • To elucidate the specific effects of serotonergic input on motoneuron properties within the feeding CPG.

Main Methods:

  • Isolation of Lymnaea snail motoneurons (B4, B8, B4CL) from the nervous system.
  • Pharmacological examination of isolated motoneurons in cell culture.
  • Coculture of motoneurons with CGCs to compare 5-HT effects with direct CGC stimulation.

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Main Results:

  • 5-HT caused prolonged depolarization and firing in all three motoneuron types.
  • Conditional bursting was observed in B4/B8 cells, with frequency modulated by CGC firing rate.
  • 5-HT application increased postinhibitory rebound (PIR) in all motoneurons via a CsCl-sensitive current.

Conclusions:

  • Serotonergic modulation by CGCs significantly impacts motoneuron membrane potential, bursting, and PIR.
  • These cellular effects are crucial for motoneuron activation during feeding in Lymnaea.
  • CGCs likely exert system-level gating and frequency control through these modulatory actions on feeding motoneurons.