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Prevention of graft-versus-host-disease with preserved graft-versus-leukemia-effect by ex vivo and in vivo modulation of CD4+ T-cells

 
: Fricke, Stephan; Hilger, Nadja; Fricke, Christian; Schönfelder, U.; Behre, Gerhard; Ruschpler, Peter; Boldt, Andreas; Oelkrug, Christopher; Sack, Ulrich; Emmrich, Frank

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Cellular and molecular life sciences 71 (2014), Nr.11, S.2135-2148
ISSN: 1420-682X
ISSN: 1420-9071
Englisch
Zeitschriftenaufsatz
Fraunhofer IZI ()
GvHD; GvL; allogeneic hematopoetic stem cell transplantation; triple transgenic mouse; anti-CD4 antibodies

Abstract
This is the first report showing that an epitope-specific ex vivo modulation of an allogeneic hematopoietic stem cell graft by the anti-human CD4 antibody MAX.16H5 IgG1 simultaneously facilitates the anti-tumor capacity of the graft (Graft-versus-leukemia effect, GvL) and the long-term suppression of the deleterious side effect Graft-versus-host-disease (GvHD). To distinguish and consolidate GvL from GvHD, the anti-human CD4 antibody MAX16.H5 IgG1 was tested in murine GvHD and tumor models. The survival rate was significantly increased in recipients receiving a MAX.16H5 IgG1 short-term (2 h) pre-incubated graft even when tumor cells were co-transplanted or when recipient mice were treated by MAX.16H5 IgG1 before transplantation. After engraftment, regulatory T-cells are generated only supporting the GvL effect. It was also possible to transfer the immune tolerance from GvHD-free recipient chimeras into third party recipient mice without the need of reapplication of MAX.16H5 IgG1 anti-human CD4 antibodies. These findings are also benefical for patients with leukemia when no matched related or unrelated donor is available and provides a safer allogeneic HSCT, which is more effective against leukemia. It also facilitates allogeneic (stem) cell transplantations for other indications (e.g., autoimmune-disorders).

: http://publica.fraunhofer.de/dokumente/N-281804.html