Abstract
Chronic graft-versus-host disease (cGVHD) is an important complication after allogeneic hematopoietic stem cell transplantation (HSCT). To define the roles of T-cells and B-cells in cGVHD, a murine minor histocompatibility complex–mismatched HSCT model was used. Depletion of donor splenocyte CD4+ T-cells and B220+ B-cells alleviated cGVHD. Allogeneic recipients had significantly increased splenic germinal centers (GCs), with significant increases in follicular T-helper (Tfh) cells and GC B-cells. There were increased expressions in Tfh cells of inducible T-cell co-stimulator (ICOS), interleukin (IL)-4 and IL-17, and in GC B-cells of B-cell activating factor receptor and ICOS ligand. Depletion of donor splenocyte CD4+ T-cells abrogated aberrant GC formation and suppressed Tfh cells and GC B-cells. Interestingly, depletion of donor splenocyte B200+ B-cells also suppressed Tfh cells in addition to GC B-cells. These results suggested that in cGVHD, both Tfh and GC B-cells were involved, and their developments were mutually dependent. The mammalian target of rapamycin (mTOR) inhibitor everolimus was effective in suppressing cGVHD, Tfh cells, and GC B-cells, either as a prophylaxis or when cGVHD had established. These results implied that therapeutic targeting of both T-cells and B-cells in cGVHD might be effective. Signaling via mTOR may be another useful target in cGVHD.
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Acknowledgments
We thank Dr. Yuk Chun (Division of Pathology, Queen Mary Hospital, Hong Kong) for his kind help in preparing the histological slides and Miss Wen-Ying Piao, Ka-Wai Leong, and Mr. Kin-Ho Lo, Lok-Man Yue, Chun-Hung Chow, and Ho-Chun Han (Department of Medicine, the University of Hong Kong) for their technique support. We also thank Dr. Xue-qiong Fu (Department of Gastroentorology and Hematology, Longgang District Central Hospital, Shenzhen) for her kind help in the experiment. This research was supported by a grant from the National Natural Science Foundation of China (No.81160074).
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Shao, L., Lie, A.K.W., Zhang, Y. et al. Aberrant germinal center formation, follicular T-helper cells, and germinal center B-cells were involved in chronic graft-versus-host disease. Ann Hematol 94, 1493–1504 (2015). https://doi.org/10.1007/s00277-015-2394-z
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DOI: https://doi.org/10.1007/s00277-015-2394-z