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Journal Article
Research Support, N.I.H., Extramural
Strategies to inhibit alloantibody production in alloprimed murine recipients of hematopoietic stem cell grafts.
American Journal of Transplantation 2015 April
Alloantibody, not primed T cells, is the major barrier to bone marrow (BM) engraftment in allosensitized mice. We have shown that a single intravenous injection of donor splenocytes, to mimic a blood transfusion, results in high, sustained levels of serum alloantibody sufficient to eliminate donor BM within 3 h, resulting in uniform mortality in lethally irradiated allogeneic recipients. Current studies focused preventing and treating allopriming. Blockade of B cell survival signals with mTACI-Ig pre- and postpriming was ineffective, as was the B cell but not plasma cell depleting anti-CD20 mAb. Germinal center formation inhibition by lymphotoxin-beta receptor-Ig (LβR-Ig) diminished allosensitization, although conditional Prmd1 (Blimp-1) deletion in CD19+ cells was highly effective. By combining anti-CD20 mAb to reduce B cells and LTβR-Ig to diminish the frequency of B cells that could form germinal centers pre- and postpriming, allosensitization was precluded, permitting long-term survival in T- and NK-depleted, irradiated allogeneic recipients, whereas combined therapy postpriming alone was ineffective. As evidence of the critical role of B cells, the proteosomal inhibitor, bortezomib, given unencapsulated or encapsulated, proved ineffective in influencing allosensitization. These data extend our understanding of allopriming and provide a potential therapy for patients at risk for allosensitization and BM graft rejection.
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