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Abstract

Immunology and Infection

Postoperative Ileus Murine Model

Published: July 12th, 2024

DOI:

10.3791/66465

1General Surgery Department, Beijing Friendship Hospital, Capital Medical University, 2National Clinical Research Center for Digestive Diseases, 3State Key Lab of Digestive Health, Beijing Friendship Hospital, Capital Medical University, 4Immunology Research Center for Oral and Systemic Health, Beijing Friendship Hospital, Capital Medical University, 5Beijing Laboratory of Oral Health, Capital Medical University School of Stomatology, 6Beijing Clinical Research Institute, 7Medical Research Center, Beijing Chaoyang Hospital, Capital Medical University, 8Beijing Institute of Brain Disorders, Capital Medical University, 9Department of Hernia and Abdominal Wall Surgery, Beijing Chaoyang Hospital, Capital Medical University

* These authors contributed equally

Abstract

Most patients experience postoperative ileus (POI) after surgery, which is associated with increased morbidity, mortality, and hospitalization time. POI is a consequence of mechanical damage during surgery, resulting in disruption of motility in the gastrointestinal tract. The mechanisms of POI are related to aberrant neuronal sensitivity, impaired epithelial barrier function, and increased local inflammation. However, the details remain enigmatic. Therefore, experimental murine models are crucial for elucidating the pathophysiology and mechanism of POI injury and for the development of novel therapies.

Here, we introduce a murine model of POI generated via intestinal manipulation (IM) that is similar to clinical surgery; this is achieved by mechanical damage to the small intestine by massaging the abdomen 1-3 times with a cotton swab. IM delayed gastrointestinal transit 24 h after surgery, as assessed by FITC-dextran gavage and fluorescence detection of the segmental digestive tract. Moreover, tissue swelling of the submucosa and immune cell infiltration were investigated by hematoxylin and eosin staining and flow cytometry. Proper pressure of the IM and a hyperemic effect on the intestine are critical for the procedure. This murine model of POI can be utilized to study the mechanisms of intestinal damage and recovery after abdominal surgery.

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