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Imlifidase and EndoS enables semi-allogeneic bone marrow engraftment in sensitized mice under reduced intensity conditioning
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Imlifidase and EndoS enables semi-allogeneic bone marrow engraftment in sensitized mice under reduced intensity conditioning
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Paper
Imlifidase and EndoS enables semi-allogeneic bone marrow engraftment in sensitized mice under reduced intensity conditioning
2025
Overview
Patients in need of a hematopoietic stem cell transplant frequently have pre-existing donor-specific antibodies (DSA) which can impair engraftment. These patients often require intensified conditioning regimens, even in the setting of partially matched (semi-allogeneic) donors. Reducing the toxicity of conditioning and desensitization protocols is therefore a major goal. We previously showed that enzymatic desensitization of donor-specific IgG using imlifidase and EndoS improved murine bone marrow engraftment in donor sensitized, autoimmune-prone recipient mice. Conditioning included a 6 Gy total body irradiation, cyclophosphamide, bortezomib, and T cell depletion. In non-autoimmune prone semi-allogeneic recipients sensitized to the donor, we demonstrate that desensitisation with imlifidase and EndoS permits long-term donor bone marrow engraftment and induces tolerance to subsequent allogeneic skin grafts under a 3 Gy irradiation protocol. Enzymatic inactivation of DSA facilitates donor hematopoietic stem cell engraftment in allo-sensitized semi-allogeneic recipients in a reduced intensity conditioning protocol.
Publisher
Cold Spring Harbor Laboratory
Subject
