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Updated: Aug 8, 2026
Orthotopic Hind Limb Transplantation in the Mouse
Published on: February 12, 2016
Donor modification leads to prolonged survival of limb allografts
W P Lee1, P E Butler, M A Randolph
1Division of Plastic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA. lee.wpa@mgh.harvard.edu
Insights
Modifying donor limb bone marrow in chimeric allografts significantly reduced immune responses and prolonged limb allograft survival in rat models. This research offers insights into improving transplant outcomes.
Area of Science:
- Transplantation immunology
- Regenerative medicine
- Surgical innovation
Background:
- Chronic immunosuppression is critical for composite tissue allograft survival, similar to visceral organ transplants.
- Limb allografts contain diverse tissues with varying antigenicity, necessitating high immunosuppression levels.
- Bone marrow within allografts is a primary target for host immune responses, often leading to rejection.
Purpose of the Study:
- To investigate the impact of donor bone marrow modification on limb allograft survival.
- To assess immune responses to chimeric limb allografts with varying donor-recipient tissue compatibility.
- To determine if altering the marrow compartment can enhance limb allograft acceptance.
Main Methods:
- Creation of chimeric limb allografts using Lewis rat vascularized grafts and Brown Norway rat bone marrow.
- Transplantation of these chimeric limbs into three distinct rat recipient groups (Buffalo, Lewis, Brown Norway) with differing allogeneic profiles.
- Evaluation of cell-mediated and humoral immune responses and assessment of limb allograft survival rates across groups.
Main Results:
- Brown Norway recipients (allogeneic graft only) showed significantly reduced cell-mediated and humoral immune responses compared to Buffalo and Lewis recipients.
- Buffalo and Lewis recipients exhibited high immune responses against the chimeric limb allografts.
- Limb allograft survival was significantly prolonged in Brown Norway recipients compared to the other experimental groups.
Conclusions:
- Donor bone marrow modification within chimeric limb allografts can modulate host immune responses.
- Reducing immunogenicity by matching the bone marrow component appears crucial for enhancing limb allograft survival.
- This strategy holds promise for improving outcomes in composite tissue allotransplantation.
Abstract:
Chronic immunosuppression is essential for maintaining human hand transplant survival because composite tissue allografts are as susceptible to rejection as visceral organ allografts. Limb allografts comprise different types of tissues with varying antigenicities, and the immunosuppressive doses required for these allografts are as high or higher than those required for solid organ allotransplantation. In particular, bone marrow is an early target of the host immune response. This study reports on donor limb modification of the marrow compartment leading to prolonged survival of limb allografts. Chimeric limb allografts comprising a Lewis rat vascularized allograft and Brown Norway rat bone marrow were created. These chimeric limbs were transplanted into three recipients: (1) Buffalo rats (n = 12), where the chimeric limb was allogeneic for both vascular graft and bone marrow; (2) Lewis rats (n = 12), where the limb was allogeneic for marrow alone; and (3) Brown Norway rats (n = 12), where the limb was allogeneic for graft alone. This study found that Brown Norway recipients elicited significantly reduced cell-mediated and humoral immune responses in comparison with the Buffalo and Lewis recipients (p < 0.001 and p < 0.01, respectively). The Buffalo and Lewis recipients both elicited high cell-mediated and humoral responses. The Brown Norway recipients also had prolonged survival of limb tissue allograft in comparison with the other experimental groups.
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