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Updated: Mar 24, 2026
Murine Model of Intestinal Ischemia-reperfusion Injury
Published on: May 11, 2016
Short term protective effects of iron in a murine model of ischemia/reperfusion
Bernhard Metzler1, Johannes Jehle, Igor Theurl
1Division of Cardiology, Medical University, A-6020, Innsbruck, Austria.
Abstract:
The role of iron in the pathogenesis of cardio-vascular disorders is still controversial. We studied the effects of iron perturbations on myocardial injury upon temporary ischemia/reperfusion. C57BL/6J male mice were injected with iron dextran for 2 weeks while controls received saline. Mice were then subjected to 30 min of myocardial ischemia and subsequent reperfusion for 6-24 h. Tissue damage was quantified histologically and by troponin T determination. The expressions of tumor necrosis factor-alpha (TNF-alpha), superoxide dismutase (SOD) and inducible nitric oxide synthase (iNOS) were investigated in non-ischemic and ischemic regions of both groups. After myocardial ischemia and reperfusion, troponin T levels, as a marker of myocardial damage, were significantly reduced in iron-treated mice as compared to control mice (P < 0.05). Under the same conditions the infarction area and damage score were significantly lower in iron-treated animals. In parallel, TNF-alpha and SOD expressions were increased in infarcted regions of iron-treated mice as compared to controls, whereas myocardial iNOS expression was significantly lower in iron-treated mice. Although, iron challenge increased radical formation and TNF-alpha expression in vivo, this did not result in myocardial damage which may be linked to the parallel induction of SOD. Importantly, iron treatment inhibited iNOS expression. Since, an increased nitric oxide (NO) formation has been linked to cardiac damage after acute myocardial infarction, iron may exert short time cardio-protective effects after induction of ischemia/reperfusion via decreasing iNOS formation.
Insights
Iron supplementation may protect the heart from injury after ischemia/reperfusion. Iron-treated mice showed reduced cardiac damage and inflammation, possibly due to decreased inducible nitric oxide synthase (iNOS) expression.
Area of Science:
- Cardiovascular Research
- Iron Metabolism
- Myocardial Pathophysiology
Background:
- The role of iron in cardiovascular disease pathogenesis remains debated.
- Iron overload and deficiency can impact cardiac function.
- Understanding iron's effects on the heart during stress is crucial.
Purpose of the Study:
- To investigate the impact of iron administration on myocardial injury following transient ischemia and reperfusion.
- To explore the molecular mechanisms underlying iron's effects on cardiac tissue during ischemic events.
Main Methods:
- C57BL/6J male mice received iron dextran or saline for 2 weeks.
- Mice underwent 30 minutes of myocardial ischemia followed by 6-24 hours of reperfusion.
- Cardiac damage was assessed via histology and troponin T levels; gene expression of TNF-alpha, SOD, and iNOS was analyzed.
Main Results:
- Iron-treated mice exhibited significantly reduced troponin T levels and infarct size post-ischemia/reperfusion.
- Tumor necrosis factor-alpha (TNF-alpha) and superoxide dismutase (SOD) expressions were elevated in iron-treated mice's infarcted regions.
- Myocardial inducible nitric oxide synthase (iNOS) expression was significantly lower in iron-treated mice.
Conclusions:
- Iron administration demonstrated short-term cardioprotective effects against ischemia/reperfusion injury in mice.
- The protective mechanism may involve increased SOD activity and, importantly, decreased iNOS expression.
- Reduced iNOS-mediated nitric oxide (NO) formation appears key to iron's beneficial effects in this model.
