Functionally distinct roles foar different miR-155 expression levels through contrasting effects on gene expression, in acute myeloid leukemia

Narayan, N; Morenos, L; Phipson, B; Willis, SN; Brumatti, G; Eggers, S; Lalaoui, N; Brown, LM; Kosasih, HJ; Bartolo, RC; Zhou, L; Catchpoole, D; Saffery, R; Oshlack, A; Goodall, GJ; Ekert, PG

Author(s): Narayan, N; Morenos, L; Phipson, B; Willis, SN; Brumatti, G; Eggers, S; Lalaoui, N; Brown, LM; Kosasih, HJ; Bartolo, RC; Zhou, L; Catchpoole, D; Saffery, R; Oshlack, A; Goodall, GJ; Ekert, PG;
Details: Publication Year 2017-04,Volume 31,Issue #4,Page 808-820
Journal Title: Leukemia
Publication Type: Journal Article
Abstract: Enforced expression of miR-155 in myeloid cells has been shown to have both oncogenic or tumour suppressor functions in acute myeloid leukemia (AML). We sought to resolve these contrasting effects of miR-155 overexpression using murine models of AML and human paediatric AML datasets. We show that the highest miR-155 expression levels inhibited proliferation in murine AML models. Over time, enforced miR-155 expression in AML in vitro and in vivo, however, favors selection of intermediate miR-155 expression levels that results in increased tumour burden in mice, without accelerating the onset of disease. Strikingly, we show that intermediate and high miR-155 expression also regulate very different subsets of miR-155 targets and have contrasting downstream effects on the transcriptional environments of AML cells, including genes involved in hematopoiesis and leukemia. Furthermore, we show that elevated miR-155 expression detected in pediatric AML correlates with intermediate and not high miR-155 expression identified in our experimental models. These findings collectively describe a novel dose-dependent role for miR-155 in the regulation of AML, which may have important therapeutic implications.Leukemia accepted article preview online, 14 October 2016. doi:10.1038/leu.2016.279.
Publisher: Springer Nature
Research Division(s): Cell Signalling And Cell Death; Molecular Immunology
PubMed ID: 27740637
Publisher's Version: https://doi.org/10.1038/leu.2016.279
Terms of Use/Rights Notice: Refer to copyright notice on published article.

Creation Date: 2016-10-19 11:52:31

Last Modified: 2018-07-05 03:45:05