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Experimental vascularized bone allografting.

M A Randolph1, M J Yaremchuk, J R Moore

  • 1Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD.

Microsurgery
|January 1, 1987
PubMed
Summary
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Cyclosporine effectively prevented rejection of vascularized bone allografts in canine and rat models, unlike azathioprine. Tolerance induction via blood transfusion was unsuccessful.

Area of Science:

  • Regenerative Medicine
  • Transplantation Immunology
  • Orthopedic Surgery

Background:

  • Vascularized bone allografts offer potential for skeletal reconstruction.
  • Understanding graft survival and rejection mechanisms is crucial for clinical application.

Purpose of the Study:

  • To investigate the fate and survival of vascularized bone allografts in canine and rat models.
  • To evaluate the efficacy of immunosuppressive agents (azathioprine, cyclosporine) in preventing graft rejection.
  • To assess the impact of histocompatibility differences on allograft survival and to explore tolerance induction strategies.

Main Methods:

  • Canine posterior rib grafts to the mandible and femur were used to study rejection and immunosuppression.
  • Genetically defined Lewis, Fischer-344 (F-344), and Brown-Norway (BN) rats were used for vascularized knee allografts.

Related Experiment Videos

  • Immunosuppression was achieved using azathioprine and cyclosporine; tolerance was attempted via blood transfusions.

    • Main Results:

    • Azathioprine was ineffective in preventing rejection in dogs; cyclosporine promoted cortical osteon survival.
    • Femur bridging with vascularized rib allografts failed in dogs.
    • Rat allografts across major histocompatibility barriers (to BN) were rejected rapidly (within 7 days), while those across minor barriers (to F-344) showed slower rejection.
    • Continuous cyclosporine administration prevented rejection in both rat models; short-term cyclosporine was effective in F-344 recipients.
    • Blood transfusions did not induce tolerance and prevent rejection.

    Conclusions:

    • Cyclosporine is a potent immunosuppressant for vascularized bone allografts, preserving osteon viability.
    • Histocompatibility significantly influences the rate of allograft rejection.
    • Short-term cyclosporine therapy can be effective for specific histocompatibility mismatches.
    • Current blood transfusion protocols are insufficient for inducing tolerance in this context.