Overexpression of sPRDM16 coupled with loss of p53 induces myeloid leukemias in mice.
Transgenic expression of the abnormal products of acute myeloid leukemia-associated (AML-associated) primary chromosomal translocations in hematopoietic stem/progenitor cells initiates leukemogenesis in mice, yet additional mutations are needed for leukemia development. We report here aberrant expression of PR domain containing 16 (PRDM16) in AML cells with either translocations of 1p36 or normal karyotype. These carried, respectively, relatively high prevalence of mutations in the TP53 tumor suppressor gene and in the nucleophosmin (NPM) gene, which regulates p53. Two protein isoforms are expressed from PRDM16, which differ in the presence or absence of the PR domain. Overexpression of the short isoform, sPRDM16, in mouse bone marrow induced AML with full penetrance, but only in the absence of p53. The mouse leukemias were characterized by multilineage cellular abnormalities and megakaryocyte dysplasia, a common feature of human AMLs with 1p36 translocations or NPM mutations. Overexpression of sPRDM16 increased the pool of HSCs in vivo, and in vitro blocked myeloid differentiation and prolonged progenitor life span. Loss of p53 augmented the effects of sPRDM16 on stem cell number and induced immortalization of progenitors. Thus, overexpression of sPRDM16 induces abnormal growth of stem cells and progenitors and cooperates with disruption of the p53 pathway in the induction of myeloid leukemia.
Shing
Danielle C
DC
Department of Experimental Oncology, European Institute of Oncology, Milan, Italy.
Trubia
Maurizio
M
Marchesi
Francesco
F
Radaelli
Enrico
E
Belloni
Elena
E
Tapinassi
Cinzia
C
Scanziani
Eugenio
E
Mecucci
Cristina
C
Crescenzi
Barbara
B
Lahortiga
Idoya
I
Odero
Maria D
MD
Zardo
Giuseppe
G
Gruszka
Alicja
A
Minucci
Saverio
S
Di Fiore
Pier Paolo
PP
Pelicci
Pier Giuseppe
PG
D000818:Animals; D001853:Bone Marrow / Q000378:metabolism / Q000473:pathology; D002454:Cell Differentiation / Q000235:genetics; D002471:Cell Transformation, Neoplastic / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D016922:Cellular Senescence / Q000235:genetics; D004268:DNA-Binding Proteins / Q000096:biosynthesis* / Q000235:genetics; D015973:Gene Expression Regulation, Leukemic; D006412:Hematopoietic Stem Cells / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D051379:Mice; D018345:Mice, Knockout; D014411:Neoplastic Stem Cells / Q000378:metabolism* / Q000473:pathology; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism; D000090243:Nucleophosmin; D020033:Protein Isoforms / Q000096:biosynthesis / Q000235:genetics; D017434:Protein Structure, Tertiary / Q000235:genetics; D014157:Transcription Factors / Q000096:biosynthesis* / Q000235:genetics; D014178:Translocation, Genetic; D016159:Tumor Suppressor Protein p53 / Q000235:genetics
D004268:DNA-Binding Proteins; C000716967:NPM1 protein, human; D009687:Nuclear Proteins; C416371:PRDM16 protein, human; C521133:Prdm16 protein, mouse; D020033:Protein Isoforms; C495901:TP53 protein, human; D014157:Transcription Factors; D016159:Tumor Suppressor Protein p53; D000090243:Nucleophosmin