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either through cleavage of SDF 1 and CXCR4 or downregulation of SDF1 expression results in the rapid egress of HSPCs from the bone marrow. Mobilization of HSPCs from the bone marrow to the peripheral blood has become the standard method to collect allografts from healthy related donors for transplantation into patients with haematologic malignancies. This procedure is associated with more rapid engraftment, shorter hospital stay, and in some circumstances, superior overall survival

an increased expression of CXCR6 on CD8 T cells that contributed to the early recruitment of these cells to the liver. Elevated expression levels of CXCL1, CXCL2, and Docetaxel the CXCR2 receptor were also found in the liver, lung, and skin of mice subjected to GVHD. However, the role of these chemokines and chemokine receptor was not completely elucidated and should be explored in future studies. Chemokines of the CC subfamily, especially CCL2, CCL3, CCL4, and CCL5, have been described to be important for the migration of donor cells to target organs during GVHD development. Some studies have shown increased levels of CCL2 early on in the liver and intestine of mice subjected to GVHD, but the role of this chemokine is not clear. Increased levels of CCL2 contribute to the migration of donor monocytes and macrophages to the lung as shown by studies in which neutralization of CCL2 or absence E7080 of CCR2 on donor cells resulted in reduced inammatory inltrates in the lung and consequently, minor lung injury. The CCL2 receptor, CCR2, has an important role in the activation and migration of CD8 T cells in the intestine

of human GVHD. Studies have shown that loss of CCR5 function by a 32 nucleotide deletion in patients undergoing allogeneic BMT resulted in a decreased incidence of GVHD. Furthermore, the presence of the CCR532 genotype in both recipient and donor cells displayed the highest protection. Thus, CCR5 may be an interesting target in GVHD. Although maraviroc, which is an inhibitor of CCR5, has been approved by the FDA for clinical use, no study has validated its use in GVHD management. CCL25 demonstrates protective properties in GVHD. Interaction of CCL25 with its receptor, CCR9, leads to the induction of regulatory T cells and suppresses antigen specic immune responses that are associated with GVHD. On the other hand, CCR9 has also been identied as a critical homing receptor for lymphocytes into inamed intestine,