Revisiting Orthotopic Rat Liver Transplant

Area of Science:

• Surgical innovation in transplantation
• Animal models for organ transplantation research
• Immunology of organ rejection

Background:

• Orthotopic liver transplantation (OLT) is a complex surgical procedure.
• Optimizing OLT techniques is crucial for improving patient outcomes.
• Understanding factors influencing OLT success, such as anhepatic time and donor characteristics, is essential.

Purpose of the Study:

• To evaluate the impact of varying anhepatic times on OLT success in a rat model.
• To assess the outcomes of partial versus whole graft OLT.
• To investigate the success rates of OLT using different donor-recipient rat strains and sexes.

Main Methods:

• Whole graft orthotopic liver transplants were performed in rats with anhepatic times of ≤20 minutes or 30 minutes.
• Partial (50%) orthotopic liver transplants were conducted using Sprague-Dawley rats.
• Various donor-recipient strain combinations (Sprague-Dawley, Lewis, Brown Norway) and sexes were utilized.

Main Results:

• Survival rates for OLT with ≤20 or 30 minutes anhepatic time were high (89-95%) with no significant difference.
• Whole and 50% graft OLT in Sprague-Dawley rats showed comparable survival rates (87-93%).
• Transplants between Lewis and Brown Norway rats, or Sprague-Dawley to Lewis, had significantly lower survival rates (6-30%), with death often occurring within 72 hours due to acute rejection or wound dehiscence.

Conclusions:

• Orthotopic liver transplantation can achieve high success rates even with extended anhepatic times.
• Transplants involving female Sprague-Dawley donors resulted in a high failure rate, indicating potential sex-mismatch issues.
• Graft survival is highly dependent on donor-recipient strain compatibility, with significant challenges observed in certain combinations.