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A mouse model for the study of necrotizing enterocolitis.

I H Krasna, C Howell, A Vega

    Journal of Pediatric Surgery
    |January 1, 1986
    PubMed
    Summary

    A new mouse model mimics necrotizing enterocolitis by temporarily blocking intestinal blood flow. Saline and dextran treatments showed protective effects against ischemic injury, with dextran being more effective in severe cases.

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    Area of Science:

    • Gastroenterology
    • Surgical Research
    • Pediatric Surgery

    Background:

    • Necrotizing enterocolitis (NEC) is a severe gastrointestinal emergency in neonates.
    • Developing reliable animal models is crucial for understanding NEC pathogenesis and testing interventions.
    • Existing models may not fully replicate the gradual development and patchy nature of human NEC lesions.

    Purpose of the Study:

    • To present and characterize a novel mouse model for studying necrotizing enterocolitis.
    • To evaluate the efficacy of intravenous saline and low molecular weight dextran in preventing ischemic injury within this model.

    Main Methods:

    • A mouse model was created by temporarily occluding both superior mesenteric vessels using a bulldog clamp.
    • The duration of occlusion was varied to induce moderate and severe intestinal ischemia.

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  • The development of intestinal lesions was histologically assessed and compared to human NEC.
  • The protective effects of intravenous saline and low molecular weight dextran were evaluated.

    • Main Results:

    • The induced temporary intestinal ischemia resulted in necrotizing lesions with gradual development and patchy distribution, mimicking human NEC.
    • Both saline and low molecular weight dextran demonstrated a protective effect against ischemic lesions in moderate ischemia.
    • In severe ischemia, both treatments were protective, with low molecular weight dextran showing a greater efficacy than saline.

    Conclusions:

    • This temporary intestinal ischemia mouse model effectively replicates key pathological features of necrotizing enterocolitis.
    • Intravenous fluid resuscitation with saline or dextran can mitigate ischemic injury in this model.
    • Low molecular weight dextran may offer superior protection compared to saline in severe ischemic conditions relevant to NEC.