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Development of a total colectomy and ileorectal anastomosis rat model to evaluate colonic metaplasia.

ABSTRACT: BACKGROUND:Ulcerative colitis is an idiopathic inflammatory condition of the colon that may require surgical intervention including proctocolectomy and either ileal pouch-anal anastomosis or in the pediatric population, low ileorectal anastomosis (IRA). Often, subsequent physiologic alteration (or colonic metaplasia) occurs in the anastomosed small bowel that includes changes in mucin content, villous blunting, and increased expression of WNT5A, a marker of colonic crypt regeneration. We developed a rat low IRA model to assess and study the development of colonic metaplasia. MATERIALS AND METHODS:We subjected male Sprague-Dawley rats (n = 17) to total colectomy and low IRA surgery and evaluated healing periodically by endoscopic evaluation. The ileum upstream of the anastomosis was assessed by hematoxylin and eosin staining, and the mucin content was measured by high iron diamine-Alcian blue staining. Wnt5a transcripts were quantified by reverse transcription and quantitative polymerase chain reaction at the 8-wk study end point. RESULTS:Although no gross endoscopic evidence of inflammation was seen throughout the course of the study, colonic metaplasia in the small bowel was detected in 7 out of 10 (70%) rats at the study end point. In rats with colonic metaplasia, enhanced expression of Wnt5a was evident at the study end point compared to levels in the terminal ileum at the time of surgery. CONCLUSIONS:Within 4-8 wk, the majority of rats subjected to IRA developed colonic metaplasia defined by villous blunting, changes in mucin content, and increased expression of Wnt5a. This model provides a method to study small bowel colonic metaplasia.

SUBMITTER: Schieffer KM

PROVIDER: S-EPMC5657454 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature

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Development of a total colectomy and ileorectal anastomosis rat model to evaluate colonic metaplasia.

Schieffer Kathleen M KM Poritz Lisa S LS Yochum Gregory S GS Koltun Walter A WA

The Journal of surgical research 20170621

<h4>Background</h4>Ulcerative colitis is an idiopathic inflammatory condition of the colon that may require surgical intervention including proctocolectomy and either ileal pouch-anal anastomosis or in the pediatric population, low ileorectal anastomosis (IRA). Often, subsequent physiologic alteration (or colonic metaplasia) occurs in the anastomosed small bowel that includes changes in mucin content, villous blunting, and increased expression of WNT5A, a marker of colonic crypt regeneration. We ...[more]

PMID: 28985852

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Project description:BackgroundSelection of intracorporeal anastomosis (IA) or extracorporeal anastomosis (EA) in laparoscopic right colectomy (LRC) remains controversial. This meta-analysis aimed to evaluate the effectiveness and safety of IA compared with EA in LRC patients.MethodsLiterature was searched systematically for randomized controlled trials (RCTs) that compared IA with EA in LRC patients until May 2021. The eligible studies for risk of bias were assessed using the Cochrane Risk of Bias Tool. Data were extracted and analysed for the following outcomes of interest: operative time, length of incision, nodal harvest, bowel function recovery, postoperative pain, postoperative complications (wound infection, anastomotic leak, ileus, obstruction, reoperation), death at 30 days, duration of hospital stay and 30-day readmission.ResultsFive RCTs, including a total of 559 patients, were eligible for meta-analysis. All of the trials reported adequate random sequence generation and allocation concealment. There were significantly better outcomes in the IA group than in the EA group in time to first flatus (mean difference (MD) -0.71 (95 per cent c.i. -1.12 to -0.31), P = 0.0005), time to first passage of stool (MD -0.53 (95 per cent c.i. -0.69 to -0.37), P < 0.00001), visual analogue scale of pain on postoperative day (POD) 3 (MD -0.76 (95 per cent c.i. -1.23 to -0.28), P = 0.002), POD 4 (MD -0.83 (95 per cent c.i. -1.46 to -0.20), P = 0.01), POD 5 (MD -0.60 (95 per cent c.i. -0.95 to -0.25), P = 0.0007), length of incision (MD -1.52 (95 per cent c.i. -2.30 to -0.74), P = 0.0001) and wound infection (relative risk 0.46 (95 per cent c.i. 0.23 to 0.91), P = 0.02). However, there were no statistically significant differences between the two groups in duration of hospital stay (P = 0.47), operative time (P = 0.07), number of lymph nodes harvested (P = 0.70), anastomotic leak (P = 0.88), postoperative ileus (P = 0.48), bleeding (P = 0.15), bowel obstruction (P = 0.24), reoperation (P = 0.34), readmission within 30 days (P = 0.26), and death (P = 0.70).ConclusionCompared with EA, IA shows a faster recovery of bowel function with fewer wound infections.

Dataset Information

Development of a total colectomy and ileorectal anastomosis rat model to evaluate colonic metaplasia.

Publications

Development of a total colectomy and ileorectal anastomosis rat model to evaluate colonic metaplasia.

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