A Novel DNA Methyltransferase Inhibitor Is Effective in an In Vivo Model of Myelodysplastic Syndrome

• Published in: Blood 2018-11, Vol.132 (Supplement 1), p.1804-1804
• Main Authors: Khawaja, Ghanwa, Chung, Yang Jo, Park, Eunsil, Difilippantonio, Micheal, Doroshow, James H., Aplan, Peter D.
• Format: Article
• Language: English
• ISSN: 0006-4971; 1528-0020
• DOI: 10.1182/blood-2018-99-119265

The myelodysplastic syndromes (MDS) are a heterogeneous group of clonal hematopoietic stem cell disorders characterized by ineffective hematopoiesis, peripheral blood cytopenias, dysplasia and a propensity for transformation to acute myeloid leukemia (AML). MDS is frequently associated with epigenetic gene silencing via methylation of cytosine residues in gene regulatory regions, and DNA methyl-transferase 1 (DNMT1) inhibitors, such as 5'azacytidine and 5-aza-2'-deoxycytidine (decitabine, DAC), are two of the three agents that are FDA approved for treatment of MDS. Although these drugs are not curative, they induce hematological improvement or improved survival in a significant fraction of MDS patients. Two novel, thiol-substituted 2'-deoxycytidine (dCyd) analogs designated T-dCyd (4'-thio-2'-deoxycytidine) and Aza-T-dCyd (5-aza-4'-thio-2'-deoxycytidine) were synthesized and shown to be potent DNMT1 inhibitors in vitro. We evaluated these drugs in vivo using the NUP98-HOXD13 (NHD13) mouse model for MDS. To mimic human MDS hematopoiesis, in which a portion of the hematopoietic output is provided by the MDS clone, and a portion provided by normal, non-MDS cells, we transplanted wild-type (WT) mice with a mixture of WT murine hematopoietic cells and NHD13 (MDS) hematopoietic cells. This bone marrow transplant (BMT) produces chimaeric recipients with bone marrow comprised of hematopoietic cells derived from both the MDS clone as well as normal hematopoietic precursors. WT and MDS cells in the mice can be distinguished by differential CD45 alleles (CD45.1 and CD45.2, respectively), which enables analysis and purification of the MDS and WT cells; this feat is not easily achieved with human MDS patient samples, which lack cell surface antigens specific for the MDS clone. At 8 weeks post-transplant; engraftment of MDS cells was documented by the presence of CD45.2+ cells in the peripheral blood, and the starting CBCs showed signs consistent with MDS including peripheral blood cytopenia and macrocytosis. Mice were randomly assigned to one of the three groups. 1) PBS, 2) T-dCyd, 3) Aza-T-dCyd. T-Cyd was dosed at 4 mg/kg/d intraperitoneally (IP) on weekdays for 2 weeks (10 doses), followed by three weeks rest; this constituted one cycle of therapy. Aza-T-dCyd was administered on the same schedule at 4 mg/kg/d IP. Flow cytometry and CBC were assessed on day 21 of each cycle, and treatment continued for up to one year, or until mice were humanely euthanized due to tach