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Updated: Jun 25, 2025

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Neuropeptide modulation of bidirectional internetwork synapses.

Savanna-Rae H Fahoum1, Dawn M Blitz1

  • 1Department of Biology and Center for Neuroscience and Behavior, Miami University, Oxford, Ohio, United States.

Journal of Neurophysiology
|May 22, 2024
PubMed
Summary
This summary is machine-generated.

A neuropeptide coordinates neural networks by both recruiting neurons and enhancing their communication. This peptide modulates intrinsic properties for recruitment and strengthens synaptic connections for coordination in rhythmic motor behaviors.

Keywords:
Gly1-SIFamidecentral pattern generatorgraded synaptic transmissionneuronal switchingstomatogastric

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Area of Science:

  • Neuroscience
  • Neurobiology
  • Crustacean neurophysiology

Background:

  • Flexible neuronal networks underlie rhythmic motor behaviors and complex neural processing.
  • Neuromodulatory inputs allow neurons to switch between or participate in multiple networks.
  • Previously, Gly1-SIFamide was shown to recruit neurons into dual-network activity by modulating intrinsic properties.

Purpose of the Study:

  • To investigate if the neuropeptide Gly1-SIFamide also modulates internetwork synapses for coordination.
  • To determine the role of Gly1-SIFamide in coordinating the lateral posterior gastric (LPG) neuron within the crab stomatogastric nervous system.

Main Methods:

  • Utilized two-electrode voltage-clamp recordings in the crab (Cancer borealis) stomatogastric nervous system.
  • Examined synaptic currents between the LPG neuron and gastric mill neurons (lateral gastric, inferior cardiac, dorsal gastric).
  • Assessed the effects of Gly1-SIFamide on synaptic currents and neuronal entrainment.

Main Results:

  • Synaptic currents between LPG and gastric mill neurons were negligible in standard saline.
  • Gly1-SIFamide significantly enhanced these typically weak internetwork synaptic currents.
  • LPG and gastric mill neurons exhibited mutual entrainment during Gly1-SIFamide application, confirming functional connectivity.

Conclusions:

  • The neuropeptide Gly1-SIFamide mediates neuronal switching through parallel actions.
  • It modulates intrinsic properties for recruitment into a second network and enhances internetwork synapses for coordination.
  • These complementary actions enable a neuron's recruitment and coordination within a second network, demonstrating peptide-mediated dual functionality.