Vascularized Composite Allotransplantation: A Functional Hind Limb Model in Mice

Area of Science:

• Transplantation immunology
• Surgical innovation
• Animal models in research

Background:

• Vascularized composite allograft (VCA) transplantation is a reconstructive option for severe tissue loss.
• Understanding VCA rejection mechanisms requires robust animal models.
• Existing models may not fully capture the complexities of VCA transplantation.

Purpose of the Study:

• To develop and validate a functional mouse model for orthotopic hind limb transplantation.
• To establish a platform for investigating VCA rejection without immunosuppression.
• To report a novel surgical technique for vascular anastomoses in hind limb transplantation.

Main Methods:

• Orthotopic hind limb transplantation performed in a mouse model.
• End-to-side anastomoses of donor aorta and inferior vena cava to recipient vessels.
• Syngeneic and fully mismatched allogeneic transplants conducted without immunosuppression.

Main Results:

• Successful functional recovery of hind limb transplants demonstrated.
• Syngeneic grafts showed long-term survival (>90 days).
• Allogeneic grafts exhibited acute rejection, confirmed by clinical and histological signs.

Conclusions:

• Feasibility of end-to-side anastomoses for hind limb transplantation established.
• The developed mouse model supports functional recovery and rejection studies.
• This technique offers a new approach for VCA research.