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Structural, neuronal, and functional adaptive changes in atrophic rat ileum.

K M Ekelund1, E Ekblad

  • 1Department of Physiology and Neuroscience, Section of Neuroendocrine Cell Biology, University of Lund, Lund University Hospital, E-blocket vân 5, S-221 85 Lund, Sweden.

Gut
|July 14, 1999
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Gut inactivity causes atrophy, leading to changes in enteric nervous system (ENS) neurons and neurotransmitter expression in bypassed rat ileum. This study reveals neuronal plasticity and cell death in response to gut remodelling.

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Area of Science:

  • Gastroenterology
  • Neuroscience
  • Cell Biology

Background:

  • Gut inactivity is linked to atrophic changes, but the underlying mechanisms are poorly understood.
  • Investigating these changes is crucial for understanding gut physiology and disease.

Purpose of the Study:

  • To examine structural, neuronal, and functional alterations in the bypassed rat ileum.
  • To elucidate the impact of gut inactivity on the enteric nervous system.

Main Methods:

  • Utilized morphometry to characterize atrophic changes in the gut wall.
  • Employed immunocytochemistry and in situ hybridization to analyze enteric neuron numbers, neurotransmitter expression, and interstitial cells of Cajal.
  • Assessed motor activity in vitro.

Main Results:

  • Bypassed ileum exhibited atrophy and gut wall remodeling.
  • Enteric neuron numbers initially increased but returned to baseline by 10 weeks. Expression of vasoactive intestinal peptide, neuropeptide Y, and pituitary adenylate cyclase activating peptide decreased, while nitric oxide synthase-expressing neurons increased.
  • Motor responses shifted from nitric oxide-mediated to non-nitrergic, and cholinergic contractions were replaced by non-adrenergic, non-cholinergic responses.

Conclusions:

  • Significant atrophic changes occur in the rat ileum following bypass.
  • The enteric nervous system demonstrates plasticity, including neuronal cell death and altered neurotransmitter expression, in response to bypass-induced gut remodeling.