Experimental small bowel transplantation utilizing cyclosporine.

Area of Science:

• Immunology
• Transplantation Surgery
• Gastroenterology

Background:

• Ectopic small bowel transplantation is a complex procedure.
• Graft survival and rejection are significant challenges in transplantation.
• Immunosuppressive therapy is crucial for allograft success.

Purpose of the Study:

• To evaluate the efficacy of cyclosporine in prolonging ectopic small bowel allograft survival in a canine model.
• To assess the impact of adding prednisone to cyclosporine on graft survival and quality.
• To identify reliable methods for monitoring allograft rejection and function.

Main Methods:

• Canine model for ectopic small bowel allotransplantation.
• Administration of cyclosporine and cyclosporine with prednisone.
• Monitoring of graft survival, gross and histological appearance.
• Assessment of allograft motility and absorption tests (xylose and fat).

Main Results:

• Cyclosporine administration resulted in a 9-fold increase in mean graft survival compared to controls.
• Addition of prednisone to cyclosporine did not further prolong survival but improved gross and histological graft appearance.
• Graft motility and histology were useful indicators of impending rejection.
• Xylose absorption tests were not predictive of rejection.
• A novel technique for measuring fat absorption in the allograft was described, showing resumption by 14 days post-transplantation.

Conclusions:

• Cyclosporine is effective in prolonging small bowel allograft survival in a canine model.
• Combined therapy with prednisone may offer benefits in graft quality without enhancing survival duration.
• Monitoring graft motility and histology are valuable tools for predicting rejection.
• Fat absorption recovery indicates functional recovery of the allograft.