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Updated: Jun 10, 2026
Murine Model of Intestinal Ischemia-reperfusion Injury
Published on: May 11, 2016
Quantification of ischemia-reperfusion injury to the small intestine using a macroscopic score
Frank Petrat1, Sandra Swoboda, Herbert de Groot
1University Hospital Essen, Institute of Physiological Chemistry, Hufelandstr 55, 45122 Essen, Germany. frank.petrat@uni-duisburg-essen.de
Introduction:
Classical methods do not allow to rapidly quantify the heterogeneously distributed ischemia-reperfusion injury along the small intestine. We therefore established a suitable macroscopic score.
Methods:
A rat model based on superior mesenteric artery occlusion (45 or 90 min ischemia; 0, 120, or 180 min reperfusion) was used on 42 rats.
Results:
Subsequent to ischemia-reperfusion or pure ischemia, macroscopic phenotypes of the small intestine were defined and differentiated based on the severity of existing petechiae and hemorrhages (macroscopic types 0-1-2-3). Analysis of the interobserver variability verified the reliability of this macroscopic differentiation. Macroscopic types were directly correlated with their histological alterations (Chiu score). On the basis of the sample hemoglobin content, a nonlinear macroscopic score (0-1-3-9) was derived from the linearly related macroscopic types. Mean macroscopic scores after 45 min ischemia/180 min reperfusion were lower than those after 90 min ischemia/120 min reperfusion. Nevertheless, all scores correlated well with their respective hemoglobin contents (R(2) = 0.87). Heterogeneous patterns of macroscopic scores that depended on the ischemic period and largely differed between individual animals were found to be distributed along the small intestine with the highest injury score at the last half of the jejunum. The iron chelator deferoxamine mesylate clearly decreased the overall tissue hemoglobin content and macroscopic score of the small intestine but local protection was restricted to the proximal and middle part of the jejunum.
Conclusion:
The local as well as overall ischemia-reperfusion injury in the rat small intestine can be rapidly and reliably assessed macroscopically.
Insights
A new macroscopic scoring system allows rapid and reliable assessment of small intestine ischemia-reperfusion injury in rats. This method correlates well with hemoglobin content and histological damage.
Area of Science:
- Gastroenterology
- Surgical Research
- Pathology
Background:
- Assessing small intestine ischemia-reperfusion (I/R) injury is challenging due to its heterogeneous distribution.
- Classical methods lack the speed required for rapid quantification.
- A reliable macroscopic scoring system is needed.
Purpose of the Study:
- To establish and validate a macroscopic scoring system for quantifying I/R injury in the rat small intestine.
- To correlate macroscopic findings with histological damage and tissue hemoglobin content.
Main Methods:
- A rat model of superior mesenteric artery occlusion was used, with varying ischemia (45-90 min) and reperfusion (0-180 min) times.
- Macroscopic phenotypes (petechiae, hemorrhages) were defined and scored (0-3).
- Interobserver variability was assessed, and scores were correlated with histological alterations (Chiu score) and hemoglobin content.
Main Results:
- A reliable macroscopic scoring system (0-9) was developed, correlating directly with histological damage and hemoglobin content (R²=0.87).
- Injury patterns were heterogeneous along the small intestine, with highest scores in the distal jejunum.
- The iron chelator deferoxamine mesylate reduced overall injury but offered limited local protection.
Conclusions:
- The developed macroscopic score provides a rapid and reliable method for assessing small intestine I/R injury.
- This scoring system aids in understanding injury patterns and evaluating potential therapeutic interventions.
