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Related Experiment Videos

Ascending enteric reflex: multiple neurotransmitter systems and interactions.

P Holzer1

  • 1Department of Experimental and Clinical Pharmacology, University of Graz, Austria.

The American Journal of Physiology
|March 1, 1989
PubMed
Summary
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The ascending enteric reflex (AER) in guinea pig small intestine involves multiple neurotransmitters. Adaptive interactions occur between neural pathways after neurotransmitter blockade.

Area of Science:

  • Neurogastroenterology
  • Enteric Nervous System Physiology
  • Pharmacology of Gut Motility

Background:

  • The enteric nervous system (ENS) controls gut motility through complex neural circuits.
  • Understanding the neurotransmitter systems involved in reflexes like the ascending enteric reflex (AER) is crucial for elucidating gut function.

Purpose of the Study:

  • To investigate the transmitter circuitry of the neural pathways mediating the ascending enteric reflex (AER) contraction of the circular muscle in the guinea pig small intestine.
  • To identify the specific neurotransmitters and neuronal populations involved in the AER.
  • To explore adaptive interactions between neural pathways following neurotransmitter blockade.

Main Methods:

  • Isolated guinea pig small intestine segments were used.

Related Experiment Videos

  • Intraluminal balloon inflation served as the distension stimulus for the AER.
  • Pharmacological agents including atropine, hexamethonium, and the tachykinin antagonist spantide were employed to block specific neurotransmitter systems.

    • Main Results:

    • Cholinergic interneurons and motor neurons form the primary AER pathway, as indicated by blockade with atropine and hexamethonium.
    • An atropine-resistant AER component involved cholinergic interneurons and tachykinin-utilizing motor neurons.
    • A hexamethonium-resistant AER component involved unidentified interneurons and cholinergic motor neurons.
    • Recovery of AER amplitude was observed over time despite continuous blockade, suggesting adaptive plasticity.

    Conclusions:

    • The AER is mediated by a complex interplay of multiple neural pathways utilizing different neurotransmitters.
    • The ENS exhibits adaptive plasticity, allowing for functional compensation after blockade of specific neurotransmitter systems.
    • These findings highlight the intricate neural control of gastrointestinal motility and the dynamic nature of enteric reflex pathways.