Longitudinal mechanical tension induces growth in the small bowel of juvenile rats.

Journal Article (Journal Article)

INTRODUCTION: The aim of our study was to apply longitudinal force to the small bowel to increase the length of intestine in juvenile rats. METHODS: Fifty juvenile rats had double barrelled, blind loop ostomies created using an isolated segment of bowel. Our intestinal lengthening device was inserted into one of the loops and the second loop served as a control. Once the device was deployed, the experimental, control, and in situ segments of bowel were evaluated for length, weight, histology, and disaccharidase enzyme activity. RESULTS: Mechanical tension increased intestinal length by 149%. The lengthened bowel also exhibited a greater total weight (218%), greater mucosal weight (122%), and increased protein mass (164%) compared with the control limb of bowel. Histologically, there was a markedly increased thickness of the muscularis propria in the lengthened bowel (200% increase compared with the control limb). Functionally, we found increased total disaccharidase activity in the lengthened bowel (between 47% and 350%, depending on the particular enzyme tested; p<0.01). CONCLUSION: Mechanical tension induces intestinal growth by increasing length, weight of the bowel and mucosa, and protein mass. Histological changes, such as increases in Paneth cells, suggest that increased proliferation and reorganisation of the mucosa and muscularis propria are a response to mechanical tension. Functionally, increased intestinal length corresponds with increased disaccharidase activity, thus implying potential increased absorptive capacity of the lengthened bowel.

Full Text

Duke Authors

Cited Authors

  • Safford, SD; Freemerman, AJ; Safford, KM; Bentley, R; Skinner, MA

Published Date

  • August 2005

Published In

Volume / Issue

  • 54 / 8

Start / End Page

  • 1085 - 1090

PubMed ID

  • 15840689

Pubmed Central ID

  • PMC1774906

International Standard Serial Number (ISSN)

  • 0017-5749

Digital Object Identifier (DOI)

  • 10.1136/gut.2004.061481


  • eng

Conference Location

  • England