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[Canine orthotopic liver transplantation]
Nihon Geka Gakkai Zasshi
|December 1, 1987
Summary
Switching from cyclosporin to mizoribine significantly improved long-term survival in canine liver transplants. This combination therapy offers a promising strategy for enhancing graft survival in hepatic allotransplantation.
Area of Science:
- Veterinary Medicine
- Transplantation Immunology
- Surgical Research
Background:
- Canine orthotopic hepatic allotransplantation presents challenges in long-term graft survival.
- Immunosuppression is critical for preventing allograft rejection.
- Current immunosuppressive protocols require optimization for better outcomes.
Purpose of the Study:
- To evaluate the efficacy of mizoribine and cyclosporin in improving long-term survival after canine liver transplantation.
- To compare the survival rates between different immunosuppressive regimens.
- To identify diagnostic markers for acute and chronic rejection.
Main Methods:
- Canine orthotopic liver transplantation was performed.
- Immunosuppression was administered using mizoribine and/or cyclosporin.
- Survival data were collected and analyzed.
- Biopsy findings and serum markers (bilirubin, S-GPT, alkaline phosphatase) were monitored.
- Diagnostic procedures like angiography were employed for complication assessment.
Main Results:
- Mizoribine monotherapy did not significantly improve survival compared to controls (10.0 +/- 2.9 days vs. 44.6 +/- 31.8 days).
- A combination of cyclosporin followed by mizoribine significantly increased survival to 145.4 +/- 70.8 days (p < 0.02 vs. controls).
- This combination also showed significantly better survival than mizoribine alone at 20 days (p < 0.05).
- Acute rejection was associated with elevated serum bilirubin, S-GPT, and alkaline phosphatase.
- Chronic rejection manifested as vanishing bile duct syndrome in one case.
- Angiography was useful for diagnosing vascular and biliary complications.
Conclusions:
- A sequential immunosuppression strategy using cyclosporin followed by mizoribine significantly enhances long-term survival in canine liver allotransplantation.
- Monitoring liver enzymes and bilirubin levels aids in diagnosing acute rejection.
- Vanishing bile duct syndrome is a potential complication of chronic rejection.
- Advanced imaging techniques are essential for diagnosing vascular and biliary complications post-transplant.