Granulocyte colony–stimulating factor (G-CSF) is often used to hasten neutrophil recovery after allogeneic bone marrow transplantation (BMT), but the clinical and immunological consequences evoked remain unclear1. We examined the effect of G-CSF administration after transplantation in mouse models and found that exposure to either standard G-CSF or pegylated-G-CSF soon after BMT substantially increased graft-versus-host disease (GVHD). This effect was dependent on total body irradiation (TBI) rendering host dendritic cells (DCs) responsive to G-CSF by upregulating their expression of the G-CSF receptor. Stimulation of host DCs by G-CSF subsequently unleashed a cascade of events characterized by donor natural killer T cell (NKT cell) activation, interferon-γ secretion and CD40-dependent amplification of donor cytotoxic T lymphocyte function during the effector phase of GVHD. Crucially, the detrimental effects of G-CSF were only present when it was administered after TBI conditioning and at a time when residual host antigen presenting cells were still present, perhaps explaining the conflicting and somewhat controversial clinical studies from the large European and North American BMT registries2,3. These data have major implications for the use of G-CSF in disease states where NKT cell activation may have effects on outcome.
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We thank D.C. Link (Washington University) and A.W. Roberts (The Walter and Eliza Hall Institute, Melbourne) for the Csf3r−/− mice and D. Pellicci (University of Melbourne) for the generation of CD1d tetramers used in this study. The TEa mice were supplied by J. Bromberg (Mount Sinai School of Medicine, New York). K.P.A.M. and C.R.E. are National Health and Medical Research Council (NHMRC) R.D. Wright Fellows. D.I.G. and M.J.S. are NHMRC Research Fellows. G.R.H. is a NHMRC Practitioner Fellow.
The bone marrow transplantation laboratory has previously received funding from Amgen USA.
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