Abstract
Exposure of acute promyelocytic leukemia (APL) cells to all-trans retinoic acid (ATRA) increases levels of Mcl-1, however, the implication of ATRA-mediated expressions of Mcl-1 in these cells remains to be fully elucidated. This study found that exposure of NB4 and PL-21 cells to ATRA increased levels of Mcl-1 in association with phosphorylation of c-jun N-terminus kinases. Down-regulation of Mcl-1 by a small interfering (siRNA) or an inhibitor of JNK significantly potentiated the ability of ATRA to induce differentiation and apoptosis in these cells. On the other hand, the anti-leukemia effects of ATRA were blunted when Mcl-1 was forced expressed in NB4 and PL-21 cells as well as leukemia cells isolated from individuals with APL. Furthermore, down-regulation of Mcl-1 by an siRNA sensitized non-APL U937 and KG-1 leukemia cells to ATRA-mediated differentiation and apoptosis. Taken together, inhibition of Mcl-1 might be useful to potentiate the action of ATRA in APL as well as non-APL AML cells.
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This work was supported in part by The Kochi University President’s Discretionary Grant (to T.I).
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Yang, J., Ikezoe, T., Nishioka, C. et al. Over-expression of Mcl-1 impairs the ability of ATRA to induce growth arrest and differentiation in acute promyelocytic leukemia cells. Apoptosis 18, 1403–1415 (2013). https://doi.org/10.1007/s10495-013-0872-0
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DOI: https://doi.org/10.1007/s10495-013-0872-0