Murine Ileocolic Bowel Resection with Primary Anastomosis
October 29th, 2014
17.2K views
Ileocolic resection is commonly performed in several human diseases; however, little is known regarding the impact of intestinal resection on surgical illnesses. This article provides instruction on executing the procedure in mice with high success, providing a means to study the effects of ileocolic resection in models of disease.
Overview
This article provides a detailed procedure for performing ileocolic resection in mice, a technique that is essential for studying the effects of intestinal resection in various diseases. The method aims to enhance understanding of surgical illnesses related to intestinal resection.
Key Study Components
Area of Science
- Surgery
- Neuroscience
- Animal Models
Background
- Ileocolic resection is commonly performed in human diseases.
- There is limited knowledge about its impact on surgical illnesses.
- This study aims to bridge that knowledge gap.
- Using mice as models allows for controlled experimentation.
Purpose of Study
- To instruct on the execution of ileocolic resection in mice.
- To provide a reliable method for studying the effects of intestinal resection.
- To enhance understanding of surgical outcomes in disease models.
Methods Used
- Ligation of the ileocecal blood supply.
- Resection of the ischemic portion of the intestine.
- Construction of the IOC colic anastomosis.
- Inspection of the anastomosis for integrity and patency.
Main Results
- Successful execution of the ileocolic resection procedure.
- Establishment of a reliable method for future studies.
- Insights into the effects of intestinal resection in disease models.
Conclusions
- The procedure can be performed with high success in mice.
- It provides a valuable tool for studying surgical illnesses.
- Further research can build on this foundational technique.
Frequently Asked Questions
What is ileocolic resection?
Ileocolic resection is a surgical procedure that involves the removal of the terminal ileum and cecum.
Why is this procedure performed in mice?
Mice are used as models to study the effects of surgical interventions in a controlled environment.
What are the key steps in the procedure?
The key steps include ligating the blood supply, removing the ischemic intestine, and constructing an anastomosis.
What is the purpose of inspecting the anastomosis?
Inspection ensures the integrity and patency of the anastomosis to prevent complications.
How does this study contribute to understanding surgical illnesses?
It provides insights into the effects of intestinal resection, which can inform treatment strategies for related diseases.
Executive Industry Relevance
This surgical model enables preclinical evaluation of intestinal resection effects in disease-relevant systems, supporting target validation and mechanistic de-risking for gastrointestinal therapeutics. By providing a reproducible murine procedure, it facilitates quantitative assessment of pathophysiological consequences, aiding in lead identification and predictive confidence for drug candidates. The technique addresses a critical gap in modeling human bowel resection outcomes, enhancing translational continuity from discovery to preclinical stages.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Enables interrogation of therapeutic hypotheses related to intestinal resection in disease models.
- Operational Value: Provides a standardized surgical approach for consistent target engagement assessment.
Screening & Assay Development
- Scientific Value: Generates disease-relevant tissue samples for biomarker analysis and pathway interrogation.
- Operational Value: Supports assay standardization through reproducible intestinal resection and anastomosis outcomes.
Translational & Preclinical Research
- Scientific Value: Models human ileocolic resection to study postoperative physiology and disease pathophysiology.
- Operational Value: Facilitates preclinical evaluation of interventions targeting anastomotic healing and bowel function recovery.
Pipeline & Workflow Integration
The method integrates into discovery biology workflows by enabling hypothesis testing of intestinal resection effects, supporting lead identification through phenotypic screening of recovery metrics, and informing preclinical decisions via quantitative histopathological and functional readouts.
- Discovery Biology: Supports pathway clarification and biological de-risking in gastrointestinal disease models.
- Screening: Enables quantitative measurement of postoperative recovery, food intake, and weight maintenance as functional endpoints.
- Analytics: Provides histopathological and survival data to compare surgical outcomes across experimental conditions.
- Translational Research: Aligns with human ileocolic resection to study mechanistic consequences in relevant preclinical models.
- Enterprise Reuse: Establishes a reusable surgical platform for multiple disease models requiring bowel resection simulation.
Operational & Enterprise Impact
- Scientific Value: Reduces mechanistic ambiguity in modeling intestinal resection consequences.
- Operational Value: Delivers high reproducibility with 95% long-term survival and minimal complications when protocol is followed.
- Strategic Value: Improves go/no-go decisions by enabling early assessment of surgical intervention effects in disease contexts.
- Portfolio Impact: Supports risk-adjusted prioritization of therapeutics targeting postoperative recovery or anastomotic integrity.
Implementation Considerations
- Requires microsurgical expertise and familiarity with rodent anatomy and anesthesia protocols.
- Dependent on operating microscope, microdissection instruments, and sterile surgical supplies.
- Necessitates standardized perioperative care including thermal support, analgesia, and liquid diet management.
- Adaptation considerations include variations in resection length and anastomotic technique across disease models.
- Practical limitations include technical complexity and the need for training to achieve consistent anastomotic patency.
Biopharma FAQs
Why is ligation of the ileocecal blood supply critical before resection?
Ligation isolates the intestinal segment to be resected, creating an ischemic zone that allows precise removal of the terminal ileum and cecum while preserving blood flow to remaining bowel. This step ensures the resection is confined to the target area, minimizing unintended damage and supporting reproducible surgical outcomes in disease models.
How does independent variable isolation of the resected bowel segment support discovery pipeline goals?
By isolating the ileocolic region through vascular ligation and transection, researchers can isolate the effects of intestinal resection from confounding variables such as systemic inflammation or dietary changes. This enables clear attribution of observed phenotypes to the surgical intervention, supporting mechanistic de-risking in target validation efforts.
What quantitative dependent variable measurements enable assessment of anastomotic success?
Anastomotic success is assessed through patency testing using a cotton swab to confirm luminal continuity and absence of leakage, combined with long-term survival monitoring and body weight tracking as functional recovery metrics. These quantitative outputs provide objective criteria for evaluating surgical technique and postoperative healing in preclinical studies.
Why do replication requirements matter for cross-functional collaboration in this model?
Replication ensures consistent anastomotic integrity and survival rates across experiments, which is essential for reliable data sharing between discovery, toxicology, and translational teams. Standardized outcomes build confidence in the model’s utility for assessing drug effects on bowel recovery and surgical complications.
What statistical analysis capabilities are required before implementing this model in drug discovery workflows?
Implementation requires the ability to analyze survival curves, weight change over time, and histopathological scores using appropriate statistical tests to compare experimental groups. These capabilities enable objective evaluation of interventions targeting postoperative recovery, anastomotic healing, or disease modification in resection models.
