Small Bowel Transplantation In Mice
August 20th, 2007
The mouse small bowel transplantation model has been recognized as an important tool to study mechanismes of immune rejection and screen new immunosuppressive drugs. However, this model is limited to use because the techniques involved is an extremely technically challenge. Now we introduce the modified technique.
My Name is, I work at Dr.K's Lab of Department of Surgery, university of California, San Francisco. Today I will show you the techniques for small transplantation in mice. As you may know, there helping are only limited number of successful SM transplantation compared to solid organ transplantation.
This is likely due to distinctive intestinal features such as high immunogenicity and high bacteria allowed leading to a high rate of postoperative complications. This is great surgical model for studying these complications. I have just show you the procedure for small bowel transplantation in mice.
The most important steps in this procedure are keeping the donor small bowel lumen clear and the operative time are short as possible. This transplantation model is extremely useful for the study of immunosuppressive agents and mechanisms of rejection in small bowel transplantation. I hope now you'll be able to carry out this procedure in your own laboratories.
Thank you.
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Overview
The mouse small bowel transplantation model is a crucial tool for studying immune rejection mechanisms and testing new immunosuppressive drugs. This presentation introduces a modified technique to enhance the feasibility of this model.
Key Study Components
Area of Science
- Transplantation biology
- Immunology
- Surgical techniques
Background
- Small bowel transplantation is less successful than solid organ transplantation.
- Distinctive intestinal features contribute to high immunogenicity.
- Postoperative complications are common due to bacterial presence.
- This model is valuable for studying these complications.
Purpose of Study
- To demonstrate a modified technique for small bowel transplantation in mice.
- To improve the success rate of small bowel transplants.
- To facilitate research on immune rejection and immunosuppressive strategies.
Methods Used
- Demonstration of surgical techniques for small bowel transplantation.
- Utilization of a mouse model to study transplantation outcomes.
- Assessment of postoperative complications.
- Evaluation of immunogenic responses.
Main Results
- Successful demonstration of the modified transplantation technique.
- Identification of key factors affecting transplant success.
- Insights into the immunogenicity of the small bowel.
- Potential for improved immunosuppressive drug screening.
Conclusions
- The modified technique enhances the feasibility of small bowel transplantation in mice.
- This model can significantly contribute to understanding immune rejection.
- Future research can leverage this model for better immunosuppressive strategies.
Frequently Asked Questions
Executive Industry Relevance
The mouse small bowel transplantation model addresses a critical gap in preclinical immunology research by enabling mechanistic study of graft rejection and immunosuppressive drug efficacy. This model supports target validation and mechanistic de-risking for gastrointestinal therapeutics where solid organ models fail to recapitulate intestinal-specific immune responses. Improved surgical feasibility increases throughput for lead identification and predictive confidence in early discovery.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Enables interrogation of intestinal-specific immunogenic pathways and rejection mechanisms.
- Operational Value: Provides a reproducible system for validating therapeutic targets in mucosal immunity.
- Predictive Value: Supports preclinical de-risking by modeling human-like postoperative complications and immune responses.
Screening & Assay Development
- Scientific Value: Facilitates standardized assessment of immunosuppressive agents in a clinically relevant graft-versus-host context.
- Operational Value: The modified suture technique reduces procedural failure, improving assay consistency and scalability.
- Predictive Value: Generates quantitative engraftment and rejection readouts for compound screening and lead optimization.
Translational & Preclinical Research
- Scientific Value: Models human intestinal transplant immunology, enabling translational biomarker discovery.
- Operational Value: Supports longitudinal monitoring of graft function and immune infiltration.
- Predictive Value: Informs risk-adjusted advancement decisions by predicting clinical rejection trajectories.
Pipeline & Workflow Integration
The model fits within the discovery continuum from target validation through lead identification to preclinical efficacy testing, particularly for immunomodulatory therapies targeting gastrointestinal inflammation or transplant rejection.
- Discovery Biology: Supports hypothesis testing of immune checkpoint pathways and cytokine signaling in graft rejection.
- Screening: Enables standardized, quantitative readouts of graft survival and histologic rejection scores.
- Analytics: Provides measurable endpoints such as reperfusion time, thrombosis incidence, and immune cell infiltration for comparative analysis.
- Translational Research: Connects mechanistic findings to preclinical validation of immunosuppressive regimens.
- Enterprise Reuse: Establishes a reusable surgical platform for iterative drug testing and mechanism-of-action studies.
Operational & Enterprise Impact
- Scientific Value: Reduces mechanistic ambiguity in intestinal immune responses and improves target confidence.
- Operational Value: Enhances reproducibility through simplified vascular anastomosis and standardized suture technique.
- Strategic Value: Increases capital efficiency by improving model success rates and reducing experimental waste.
- Portfolio Impact: Enables data-driven go/no-go decisions in immunomodulatory pipelines with better risk stratification.
Implementation Considerations
- Requires expertise in microsurgical techniques and rodent anatomy.
- Dependence on fine suture tools (10-0) and magnification systems for vascular anastomosis.
- Necessitates standardized postoperative care protocols to monitor infection and graft function.
- Adaptation considerations include variations in donor-recipient size matching and ischemic time.
- Practical limitations include model complexity and the need for rigorous aseptic technique to prevent sepsis.
Biopharma FAQs
Chapters in this video
8:09
10. locating inferior vena cava
35:32
Conclusion
11:57
20. harvesting donor small bowel
33:14
Sewing up Abdominal Cavity
8:15
11. injecting heparin into the inferior vena cava
17:15
6. suturing donor mesenteric artery to recipient aorta
27:50
3. cutting ileal end of donor small bowel
11:19
18. cutting away mesenteric tissue
12:09
Preparing Recipient Mouse for Small Bowel Transplantation
23:01
9. flipping donor small bowel in order to finish suture of mesenter
32:02
8. suturing jejunal end of donor small bowel to stoma
16:31
4. repeat procedure for aorta
1:18
Harvesting Small Bowel from Donor Mouse
8:36
12. cutting mesenteric artery
4:21
3. cleaning out small bowel contents before ligating ileum
25:56
12. releasing ligatures to open circulation to donor small bowel
2:46
2. clearing away tissue to allow ligation of small bowel
16:17
3. performing veinotomy on inferior vena cava
24:53
11. final suture for anastamosis of donor mesenteric artery to reci
1:20
1. performing Tail Pinch to Ensure Mouse is Anesthetized
4:50
4. ligating ileum
0:16
Introduction
5:20
5. exposing and ligating mesenteric vessels
13:29
2. clearing away tissue in order to apply ligatures
0:03
Title
27:20
1. clamping ileal end of donor small bowel
14:35
3. applying ligatures to inferior vena cava and inferior aorta
11:34
19. cutting portal vein
19:59
7. suturing donor portal vein to recipient inferior vena cava
26:47
Connecting Donor Small Bowel to Recipient Small Bowel
10:56
17. cutting ileal end of ligated small bowel
23:35
10. suturing donor mesenteric artery to other side of aorta
9:37
15. cutting away small bowel mesenteric tissue
7:28
8. ligating branch of portal vein
29:10
5. flipping small bowel clamps in order to suture other side of ana
30:20
6. removing clamps
6:18
6. exposing mesenteric artery which will be cut when small bowel is
15:15
1. placing donor small bowel in recipient mouse
10:27
16. cutting away mesenteric tissue until the portal vein is reached
31:14
7. creating stoma for jejunal end of donor small bowel
13:20
1. exposing inferior vena cava and aorta
15:03
Connecting Donor Small Bowel Circulation to Recipient Circulation
22:39
8. final suture for anastamosis of donor portal vein to recipient i
27:39
2. cutting recipient jejunum
9:23
14. cutting jejunal end of ligated small bowel
17:00
5. washing away blood from vessels with saline
6:42
7. exposing portal vein
7:58
9. exposing other side of mesenteric artery
15:56
puncturing inferior vena cava for veinotomy
8:54
13.clearing away tissue from mesentaric artery
28:04
4. suturing one side of donor ileum to recipient jejunum
32:40
9. cutting ligature to jejunal end of donor small bowel
