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Journals Journal of Leukocyte Biology Volume 85 Issue 3

Histone deacetylase inhibitors (HdI) could potentially improve the differentiation of leukemic dendritic cells (DC). Therefore, bone marrow samples from 100 children with acute lymphoblastic leukemia (ALL) were cultured in the cytokines TNF-α, GM-CSF, c-kit ligand, and fetal liver tyrosine kinase 3 ligand, with or without IL-3 and -4 and after administration of HdI valproic acid (VAL), suberoylanilide hydroxamic acid (SAHA), isobutyramid, or trichostatin A. Among the tested samples, 25 were positive for the chromosomal translocation t(12;21), encoding the fusion gene translocation ETS-like leukemia/acute myeloid leukemia 1 ( TEL/AML1 ). SAHA increased CD83 expression of TEL/AML1 -positive blasts in conditions without ILs, and SAHA and VAL increased the number of CD86(+)80(–) cells in the presence of ILs. VAL and isobutyramid supported the allostimulatory capacities of TEL/AML1 -positive, leukemic DC; VAL and SAHA reduced those of TEL/AML1 -negative DC. Cytotoxic T cells sensitized with leukemic DC produced more IFN-γ and TNF-α upon presentation of the TEL/AML1 peptide. They also induced the cytotoxic lysis of nondifferentiated blasts, which was enhanced when TEL/AML1 -positive DC had developed after addition of VAL or SAHA. Therefore, the use of HdI in the differentiation of leukemic DC from patients with TEL/AML1 -positive ALL is recommended.

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Histone deacetylase inhibition improves differentiation of dendritic cells from leukemic blasts of patients with TEL/AML1-positive acute lymphoblastic leukemia

More Info
  • Publisher Society for Leukocyte Biology
  • Copyright Copyright © 2009 by the Federation of American Societies for Experimental Biology
  • ISSN 0741-5400
  • D.O.I. 10.1189/jlb.0808469
  • Publisher site Get PDF  

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