Functional evaluation of the grafted wall with porcine-derived small intestinal submucosa (SIS) to a stomach defect in rats.

Published

Journal Article

BACKGROUND: Small intestinal submucosa (SIS) represents a novel bio-scaffolding material that may be used to repair hollow-organ defects. However, it is unclear whether neurophysiologic responses return to SIS-grafted areas in the gut. We evaluated the functional recovery of a stomach defect grafted with the porcine-derived SIS. METHODS: Twelve rats had a full-thickness defect created in the stomach. SIS was secured to the gastric wall. After 6 months, muscle strips were harvested from within the grafted area to perform both a histologic and a functional study. Additional full-thickness muscle strips were harvested from the posterior in the same stomach as controls. A dose response curve was obtained with carbachol (CCH) or sodium nitroprusside (SNP). Activation of intrinsic nerves was achieved by electrical field stimulation (EFS). RESULTS: The response to CCH and amplitude in EFS showed tonic contraction in both controls and SIS strips in a concentration-dependent and frequency-dependent manner. The magnitude after each stimulation was significantly lower in SIS strips compared with controls (P < .01). However, the contraction ratio of EFS to ED(50) of CCH was not significantly different between the groups. Additionally, SNP produced relaxation in both strips in a concentration-dependent manner. Histologic findings revealed that an insufficient amount of smooth-muscle cells existed in the muscularis propria, whereas compensated growth was observed in the submucosa with nerve regeneration. CONCLUSIONS: This study demonstrates that SIS provides a template for nerve migration to the graft in the rodent stomach. Innervations showed a similar distribution to that observed in the controls. The clinical implications of such findings warrant additional investigation.

Full Text

Duke Authors

Cited Authors

  • Ueno, T; de la Fuente, SG; Abdel-Wahab, OI; Takahashi, T; Gottfried, M; Harris, MB; Tatewaki, M; Uemura, K; Lawson, DC; Mantyh, CR; Pappas, TN

Published Date

  • September 2007

Published In

Volume / Issue

  • 142 / 3

Start / End Page

  • 376 - 383

PubMed ID

  • 17723890

Pubmed Central ID

  • 17723890

International Standard Serial Number (ISSN)

  • 0039-6060

Digital Object Identifier (DOI)

  • 10.1016/j.surg.2007.04.019

Language

  • eng

Conference Location

  • United States