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Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
A myeloid tumor suppressor role for NOL3 .
Journal of Experimental Medicine 2017 March 7
Despite the identification of several oncogenic driver mutations leading to constitutive JAK-STAT activation, the cellular and molecular biology of myeloproliferative neoplasms (MPN) remains incompletely understood. Recent discoveries have identified underlying disease-modifying molecular aberrations contributing to disease initiation and progression. Here, we report that deletion of Nol3 ( Nucleolar protein 3 ) in mice leads to an MPN resembling primary myelofibrosis (PMF). Nol3-/- MPN mice harbor an expanded Thy1+ LSK stem cell population exhibiting increased cell cycling and a myelomonocytic differentiation bias. Molecularly, this phenotype is mediated by Nol3 -/- -induced JAK-STAT activation and downstream activation of cyclin-dependent kinase 6 ( Cdk6 ) and Myc Nol3-/- MPN Thy1+ LSK cells share significant molecular similarities with primary CD34+ cells from PMF patients. NOL3 levels are decreased in CD34+ cells from PMF patients, and the NOL3 locus is deleted in a subset of patients with myeloid malignancies. Our results reveal a novel genetic PMF-like mouse model and identify a tumor suppressor role for NOL3 in the pathogenesis of myeloid malignancies.
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