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Distinct roles for major and minor antigen barriers in chimerism-based tolerance under irradiation-free conditions.
Mahr, Benedikt; Pilat, Nina; Granofszky, Nicolas; Muckenhuber, Moritz; Unger, Lukas W; Weijler, Anna M; Wiletel, Mario; Steiner, Romy; Dorner, Lisa; Regele, Heinz; Wekerle, Thomas.
Afiliação
  • Mahr B; Section of Transplantation Immunology, Department of Surgery, Medical University of Vienna, Vienna, Austria.
  • Pilat N; Section of Transplantation Immunology, Department of Surgery, Medical University of Vienna, Vienna, Austria.
  • Granofszky N; Section of Transplantation Immunology, Department of Surgery, Medical University of Vienna, Vienna, Austria.
  • Muckenhuber M; Section of Transplantation Immunology, Department of Surgery, Medical University of Vienna, Vienna, Austria.
  • Unger LW; Section of Transplantation Immunology, Department of Surgery, Medical University of Vienna, Vienna, Austria.
  • Weijler AM; Section of Transplantation Immunology, Department of Surgery, Medical University of Vienna, Vienna, Austria.
  • Wiletel M; Section of Transplantation Immunology, Department of Surgery, Medical University of Vienna, Vienna, Austria.
  • Steiner R; Section of Transplantation Immunology, Department of Surgery, Medical University of Vienna, Vienna, Austria.
  • Dorner L; Section of Transplantation Immunology, Department of Surgery, Medical University of Vienna, Vienna, Austria.
  • Regele H; Clinical Institute of Pathology, Medical University of Vienna, Vienna, Austria.
  • Wekerle T; Section of Transplantation Immunology, Department of Surgery, Medical University of Vienna, Vienna, Austria.
Am J Transplant ; 21(3): 968-977, 2021 03.
Article em En | MEDLINE | ID: mdl-32633070
Eliminating cytoreductive conditioning from chimerism-based tolerance protocols would facilitate clinical translation. Here we investigated the impact of major histocompatibility complex (MHC) and minor histocompatibility antigen (MiHA) barriers on mechanisms of tolerance and rejection in this setting. Transient depletion of natural killer (NK) cells at the time of bone marrow (BM) transplantation (BMT) (20 × 106 BALB/c BM cells → C57BL/6 recipients under costimulation blockade [CB] and rapamycin) prevented BM rejection. Despite persistent levels of mixed chimerism, BMT recipients gradually rejected skin grafts from the same donor strain. Extending NK cell depletion did not improve skin graft survival. However, F1 (C57BL/6×BALB/c) donors, which do not elicit NK cell-mediated rejection, induced durable chimerism and tolerance. In contrast, if F1 donors with BALB/c background only were used (BALB/c×BALB.B), no tolerance was observed. In the absence of MiHA disparities (B10.D2 donors, MHC-mismatch only), temporal NK cell depletion established stable chimerism and tolerance. Conversely, MHC identical BM (BALB.B donors, MiHA mismatch only) readily engrafted without NK cell depletion but no skin graft tolerance ensued. Therefore, we conclude that under CB and rapamycin, MHC disparities provoke NK cell-mediated BM rejection in nonirradiated recipients whereas MiHA disparities do not prevent BM engraftment but impede skin graft tolerance in established mixed chimeras.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Quimerismo / Tolerância Imunológica Tipo de estudo: Guideline Limite: Animals Idioma: En Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Quimerismo / Tolerância Imunológica Tipo de estudo: Guideline Limite: Animals Idioma: En Ano de publicação: 2021 Tipo de documento: Article