title: Histone deacetylase inhibitor but not arsenic trioxide differentiates acute promyelocytic leukaemia cells with t(11;17) in combination with all-trans retinoic acid.
abstract: Acute promyelocytic leukaemia (APL) with t(11;17)/PLZF-RARalpha responds poorly to all-trans retinoic acid (ATRA) and arsenic trioxide (As2O3), in contrast to APL with t(15;17)/PML-RARalpha. Molecular studies have shown that histone deacetylase (HDAC) recruited by PLZF-RARalpha is associated with the ATRA resistance. Here, we analysed in vitro the differentiation of APL cells with t(11;17) using ATRA, As203, granulocyte colony-stimulating factor (G-CSF), HDAC inhibitor trichostatin A (TSA), or combinations of these. Although 1 microM ATRA, which stimulated the differentiation of APL cells with t(15;17), was insufficient to induce differentiation, 3 microM ATRA induced terminal differentiation into granulocytes. As203 alone or in combination with ATRA induced neither differentiation nor apoptosis. However, the combination of TSA and 1 microM ATRA had a potent differentiating effect, although TSA alone had little effect. The combination of 1 microM ATRA and G-CSF did not induce differentiation. These results indicate that APL cells with t(11;17) need a higher concentration of ATRA than those with t(15;17) to differentiate and suggest that HDAC inhibitor is a promising differentiation enhancer in APL with t(11;17).
authors.affiliation: Department of Infectious Diseases, Nagoya University School of Medicine, Nagoya, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kitamura
authors.forename: S
authors.initials: S
authors.lastname: Hoshi
authors.forename: M
authors.initials: M
authors.lastname: Koike
authors.forename: H
authors.initials: H
authors.lastname: Kiyoi
authors.forename: H
authors.initials: H
authors.lastname: Saito
authors.forename: T
authors.initials: T
authors.lastname: Naoe
mesh_terms: D000328:Adult; D000368:Aged; D000970:Antineoplastic Agents / Q000494:pharmacology / Q000627:therapeutic use*; D000077237:Arsenic Trioxide; D001152:Arsenicals / Q000494:pharmacology / Q000627:therapeutic use; D002454:Cell Differentiation / Q000187:drug effects; D002880:Chromosomes, Human, Pair 11; D002886:Chromosomes, Human, Pair 17; D004359:Drug Therapy, Combination; D004791:Enzyme Inhibitors / Q000627:therapeutic use*; D005260:Female; D056572:Histone Deacetylase Inhibitors; D006801:Humans; D006877:Hydroxamic Acids / Q000627:therapeutic use*; D015473:Leukemia, Promyelocytic, Acute / Q000188:drug therapy* / Q000235:genetics; D008297:Male; D010087:Oxides / Q000494:pharmacology / Q000627:therapeutic use; D014178:Translocation, Genetic; D014212:Tretinoin / Q000494:pharmacology / Q000627:therapeutic use*; D014407:Tumor Cells, Cultured / Q000187:drug effects
chemical_list: D000970:Antineoplastic Agents; D001152:Arsenicals; D004791:Enzyme Inhibitors; D056572:Histone Deacetylase Inhibitors; D006877:Hydroxamic Acids; D010087:Oxides; C012589:trichostatin A; D014212:Tretinoin; D000077237:Arsenic Trioxide