Abstract:
:Acute myeloid leukemia (AML) involves a block in terminal differentiation of the myeloid lineage and uncontrolled proliferation of a progenitor state. Using phorbol myristate acetate (PMA), it is possible to overcome this block in THP-1 cells (an M5-AML containing the MLL-MLLT3 fusion), resulting in differentiation to an adherent monocytic phenotype. As part of FANTOM4, we used microarrays to identify 23 microRNAs that are regulated by PMA. We identify four PMA-induced microRNAs (mir-155, mir-222, mir-424 and mir-503) that when overexpressed cause cell-cycle arrest and partial differentiation and when used in combination induce additional changes not seen by any individual microRNA. We further characterize these pro-differentiative microRNAs and show that mir-155 and mir-222 induce G2 arrest and apoptosis, respectively. We find mir-424 and mir-503 are derived from a polycistronic precursor mir-424-503 that is under repression by the MLL-MLLT3 leukemogenic fusion. Both of these microRNAs directly target cell-cycle regulators and induce G1 cell-cycle arrest when overexpressed in THP-1. We also find that the pro-differentiative mir-424 and mir-503 downregulate the anti-differentiative mir-9 by targeting a site in its primary transcript. Our study highlights the combinatorial effects of multiple microRNAs within cellular systems.
journal_name
Leukemiajournal_title
Leukemiaauthors
Forrest AR,Kanamori-Katayama M,Tomaru Y,Lassmann T,Ninomiya N,Takahashi Y,de Hoon MJ,Kubosaki A,Kaiho A,Suzuki M,Yasuda J,Kawai J,Hayashizaki Y,Hume DA,Suzuki Hdoi
10.1038/leu.2009.246subject
Has Abstractpub_date
2010-02-01 00:00:00pages
460-6issue
2eissn
0887-6924issn
1476-5551pii
leu2009246journal_volume
24pub_type
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