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- W2044186161 abstract "Denileukin Diftitox (ONTAK®, DAB389 IL-2) is a recombinant DNA-derived fusion protein depleting cells that express high-affinity IL-2 receptor. Important cell targets are CD4+CD25+Foxp3+ regulatory T cells (Treg). Elimination of immunosuppressive Treg by Denileukin Diftitox may provide a way to modulate immune tolerance following stem cell transplantation. Here, we combined Treg depletion with a vaccination approach to induce donor-specific immune reactions. To investigate this approach we chose the mixed chimerism canine stem cell transplantation model which represents a high state of tolerance between two hematopoietic systems. The aim was therefore to induce a graft versus hematopoiesis effect thereby converting mixed to full donor chimerism. Dog leukocyte antigen identical siblings that had developed a stable mixed chimerism after non-myeloablative stem cell transplantation received a single dose of Denileukin Diftitox (18 μg/kg, i.v.) followed by several cell-lysate vaccinations. Host peripheral blood mononuclear cell lysates combined with CpG-ODN, and Montanide® ISA 51 were locally applied. In vitro studies demonstrated that canine Treg are a target of Denileukin Diftitox. The suppression of T-cell proliferation by Treg was abolished by addition of Denileukin Diftitox (10 nM). An increase of proliferation of median 300% (range: 200%–425%) was observed. No change in donor chimerism was observed after administration of Denileukin Diftitox and vaccination. This study highlights that application of Denileukin Diftitox resulted in a depletion of Treg followed by an increase of immune response in vitro. This effect could not be confirmed in vivo even if the immune system was stimulated by vaccinations." @default.
- W2044186161 created "2016-06-24" @default.
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- W2044186161 date "2012-01-01" @default.
- W2044186161 modified "2023-10-16" @default.
- W2044186161 title "Upfront Denileukin Diftitox as in vivo regulatory T-cell depletion in order to enhance vaccination effects in a canine allogeneic hematopoietic stem cell transplantation model" @default.
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- W2044186161 doi "https://doi.org/10.1016/j.vetimm.2011.11.009" @default.
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