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Related Experiment Videos

Microflora-derived polyamines modulate obstruction-induced colonic mucosal hypertrophy.

D L Osborne1, E R Seidel

  • 1Department of Physiology, School of Medicine, East Carolina University, Greenville, North Carolina 27858.

The American Journal of Physiology
|June 1, 1989
PubMed
Summary
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Intraluminal polyamines from gut bacteria significantly influence the colon's response to obstruction. Antibiotic treatment reduced this effect, indicating polyamines are key mediators of mucosal adaptation.

Area of Science:

  • Gastroenterology
  • Microbiology
  • Molecular Biology

Background:

  • Colonic obstruction triggers significant mucosal changes.
  • The role of gut microflora-derived polyamines in this response is not fully understood.

Purpose of the Study:

  • To investigate the role of intraluminal polyamines in the colonic mucosal response to obstruction.
  • To determine if microflora-derived polyamines modulate the trophic response.

Main Methods:

  • Sprague-Dawley rats underwent sham or complete colonic obstruction.
  • Animals received either saline or antibiotics orally.
  • Colonic mucosal wet weight, DNA, RNA, and protein were measured.
  • Bacterial and epithelial cell polyamine uptake activities were assessed.

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Main Results:

  • Obstruction increased mucosal wet weight, DNA, RNA, and protein in saline-treated rats, but only DNA in antibiotic-treated rats.
  • Polyamines and bacterial decarboxylase activities were elevated post-obstruction but reduced by antibiotics.
  • Antibiotics blocked [14C]putrescine uptake by intestinal epithelial cells.

Conclusions:

  • Intraluminal polyamines, produced by gut bacteria, play a crucial role in the colonic mucosal trophic response to obstruction.
  • Polyamines modulate mucosal adaptation, with bacterial production being a significant factor.