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Neutrophil granulocytes recruited upon translocation of intestinal bacteria enhance graft-versus-host disease via tissue damage

Abstract

Acute graft-versus-host disease (GVHD) considerably limits wider usage of allogeneic hematopoietic cell transplantation (allo-HCT). Antigen-presenting cells and T cells are populations customarily associated with GVHD pathogenesis. Of note, neutrophils are the largest human white blood cell population. The cells cleave chemokines and produce reactive oxygen species, thereby promoting T cell activation1,2. Therefore, during an allogeneic immune response, neutrophils could amplify tissue damage caused by conditioning regimens. We analyzed neutrophil infiltration of the mouse ileum after allo-HCT by in vivo myeloperoxidase imaging and found that infiltration levels were dependent on the local microbial flora and were not detectable under germ-free conditions. Physical or genetic depletion of neutrophils reduced GVHD-related mortality. The contribution of neutrophils to GVHD severity required reactive oxygen species (ROS) because selective Cybb (encoding cytochrome b-245, beta polypeptide, also known as NOX2) deficiency in neutrophils impairing ROS production led to lower levels of tissue damage, GVHD-related mortality and effector phenotype T cells. Enhanced survival of Bcl-xL transgenic neutrophils increased GVHD severity. In contrast, when we transferred neutrophils lacking Toll-like receptor-2 (TLR2), TLR3, TLR4, TLR7 and TLR9, which are normally less strongly activated by translocating bacteria, into wild-type C57BL/6 mice, GVHD severity was reduced. In humans, severity of intestinal GVHD strongly correlated with levels of neutrophils present in GVHD lesions. This study describes a new potential role for neutrophils in the pathogenesis of GVHD in both mice and humans.

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Figure 1: Anti-Ly6G antibody treatment improves survival after MHC-mismatched allo-HCT.
Figure 2: Myeloperoxidase-positive cells accumulate on day 3 following allo-HCT in the terminal ileum.
Figure 3: NOX2 deficiency of the recipient delays GVHD.
Figure 4: Neutrophil recruitment into the intestines is dependent on commensal microflora, and neutrophil-mediated tissue damage requires neutrophil activation via TLRs.

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Acknowledgements

This study was supported by the Deutsche Jose Carreras Leukämie Stiftung (DJCLS grant # R12/11), Deutsche Forschungsgemeinschaft (DFG), Germany, Heisenberg Professorship to R.Z. (DFG ZE 872/3-1) and DFG individual grant to R.Z. (DFG ZE 872/1-2), in part by SFB 850 (to R.Z.), Excellence Initiative of the German Research Foundation (GSC-4, Spemann Graduate School to R.Z. and G.H. and BIOSS II, project no. B13 to R.Z.), Deutsche Krebshilfe (to R.Z.), and Marie Curie FP7-IRG268390 (to A.T.) and also in part by the IDEA 2012 award (LSU Health Sciences Center, to G.C.H.). A.M. was funded by the European Research Council and the Wellcome Trust. H.H. was supported by the American Lebanese Syrian Associated Charities (ALSAC). We thank M. Follo for proofreading the manuscript.

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L.S., L.G., S.P., F.J.K, S.V.R., A.T., S.G., M.F., F.L., A.S. and K.H. helped design the experiments and performed experiments. S.F.M., R.M., J.F., P.H., M.P., A.M., F.D.v.L. and J.D. helped design the experiments, provided essential reagents and discussed the data. O.S. helped collect patient samples and provided clinical data, H.H. helped design experiments with HoxB8 cells and discussed data. W.R. and N.B. performed and analyzed magnetic resonance imaging experiments. P.W. performed anti-Ly6G antibody measurement in serum of mice, analyzed data and helped write the manuscript. A.S.-G. analyzed GVHD histopathology and neutrophil infiltration. D.P. performed and analyzed microarray experiments. G.C.H., G.H. and R.Z. developed the overall concept, supervised the experiments, discussed the data and wrote the manuscript.

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Correspondence to Robert Zeiser.

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Schwab, L., Goroncy, L., Palaniyandi, S. et al. Neutrophil granulocytes recruited upon translocation of intestinal bacteria enhance graft-versus-host disease via tissue damage. Nat Med 20, 648–654 (2014). https://doi.org/10.1038/nm.3517

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