Cervical small bowel transplantation in the rat: a useful tool

Area of Science:

• Surgical Innovation
• Transplant Immunology
• Gastroenterology

Background:

• Orthotopic intestinal transplantation in rats is successful but extra-abdominal graft placement may be necessary.
• Existing models may not fully capture the complexities of monitoring isolated intestinal transplants.

Purpose of the Study:

• To describe and validate a microsurgical technique for cervical intestinal transplantation in rats.
• To establish a model for investigating immune responses in hosts with existing intra-abdominal bowel transplants.

Main Methods:

• A 10 cm jejunal segment was harvested on a vascular pedicle (superior mesenteric artery and vein).
• Anastomoses were performed between the donor jejunum and recipient carotid artery (CA) and external jugular vein (EJV).
• The graft was placed in a subcutaneous cervical pocket with exteriorized ends, performed in 11 donor-recipient pairs.

Main Results:

• The cervical intestinal transplantation technique was technically feasible with no complications in 11 rats.
• All rats survived long-term with monitored grafts, showing expected immune responses (rejection, GVHD, acceptance).
• Rejection and GVHD were not fatal, indicating the model's suitability for studying immune responses.

Conclusions:

• Cervical intestinal transplantation in rats is a feasible and reliable technique for monitoring isolated intestinal transplants.
• This model allows for the study of transplant immunology and physiology without affecting the recipient's normal intestinal function.
• The technique has potential applications in understanding graft acceptance, rejection, and graft-versus-host disease in intestinal transplantation.