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Title: The orphan nuclear receptor EAR-2 (NR2F6) inhibits hematopoietic cell differentiation and induces myeloid dysplasia in vivo

Journal Article · · Biomarker Research
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6];  [7]
  1. Nuclear Exploration Inc., Palo Alto, CA (United States); Univ. of Toronto, ON (Canada). Sunnybrook Research Inst. Dept. of Medical Biophysics; Sunnybrook Research Inst., Toronto, ON (Canada). Biological Sciences; DOE/OSTI
  2. Sunnybrook Research Inst., Toronto, ON (Canada). Biological Sciences; Univ. of Toronto, ON (Canada). Dept. of Immunology
  3. Univ. of Toronto, ON (Canada). Sunnybrook Research Inst. Dept. of Medical Biophysics; Sunnybrook Research Inst., Toronto, ON (Canada). Biological Sciences
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Engineering Division
  5. Virginia Commonwealth Univ., Richmond, VA (United States). Dept. of Pathology
  6. Univ. Health Network, Toronto, ON (Canada). Dept. of Lab. Hematology
  7. Univ. of Toronto, ON (Canada). Sunnybrook Research Inst. Dept. of Medical Biophysics; Sunnybrook Research Inst., Toronto, ON (Canada). Biological Sciences; Virginia Commonwealth Univ., Richmond, VA (United States). Dept. of Pathology; Univ. of Toronto, ON (Canada). Dept. of Medicine; Toronto Sunnybrook Regional Cancer Centre, Toronto, ON (Canada). Myelodysplastic Syndromes Program. Dept. of Medical Oncology

Background: In patients with myelodysplastic syndrome (MDS), bone marrow cells have an increased predisposition to apoptosis, yet MDS cells outcompete normal bone marrow (BM)–suggesting that factors regulating growth potential may be important in MDS. We previously identified v-Erb A related-2 (EAR-2, NR2F6) as a gene involved in control of growth ability. Methods: Bone marrow obtained from C57BL/6 mice was transfected with a retrovirus containing EAR-2-IRES-GFP. Ex vivo transduced cells were flow sorted. In some experiments cells were cultured in vitro, in other experiments cells were injected into lethally irradiated recipients, along with non-transduced bone marrow cells. Short-hairpin RNA silencing EAR-2 was also introduced into bone marrow cells cultured ex vivo. Results: Here, we show that EAR-2 inhibits maturation of normal BM in vitro and in vivo and that EAR-2 transplant chimeras demonstrate key features of MDS. Competitive repopulation of lethally irradiated murine hosts with EAR2-transduced BM cells resulted in increased engraftment and increased colony formation in serial replating experiments. Recipients of EAR-2-transduced grafts had hypercellular BM, erythroid dysplasia, abnormal localization of immature precursors and increased blasts; secondary transplantation resulted in acute leukemia. Animals were cytopenic, having reduced numbers of erythrocytes, monocytes and granulocytes. Suspension culture confirmed that EAR-2 inhibits granulocytic and monocytic differentiation, while knockdown induced granulocytic differentiation. We observed a reduction in the number of BFU-E and CFU-GM colonies and the size of erythroid and myeloid colonies. Serial replating of transduced hematopoietic colonies revealed extended replating potential in EAR-2-overexpressing BM, while knockdown reduced re-plating ability. EAR-2 functions by recruitment of histone deacetylases, and inhibition of differentiation in 32D cells is dependent on the DNA binding domain. Conclusions: This data suggest that NR2F6 inhibits maturation of normal BM in vitro and in vivo and that the NR2F6 transplant chimera system demonstrates key features of MDS, and could provide a mouse model for MDS.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
HSC Foundation; J. Douglas Crashley, Canadian Institutes of Health Research (CIHR); USDOE Office of Science (SC)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1627060
Journal Information:
Biomarker Research, Journal Name: Biomarker Research Journal Issue: 1 Vol. 6; ISSN 2050-7771
Publisher:
BioMed CentralCopyright Statement
Country of Publication:
United States
Language:
English

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NOD/SCID mice transplanted with marrow from patients with myelodysplastic syndrome (MDS) show long-term propagation of normal but not clonal human precursors journal May 2003
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Impaired clonogenic growth of myelodysplastic bone marrow progenitors in vitro is irrelevant to their apoptotic state journal August 2004
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Mouse models of myelodysplastic syndromes journal July 2011
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Myelodysplastic Cells in Patients Reprogram Mesenchymal Stromal Cells to Establish a Transplantable Stem Cell Niche Disease Unit journal June 2014
Identification of a role for the nuclear receptor EAR-2 in the maintenance of clonogenic status within the leukemia cell hierarchy journal June 2011
An MDS xenograft model utilizing a patient-derived cell line journal December 2013
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Negative regulation of granulocytic differentiation in the myeloid precursor cell line 32Dcl3 by ear-2, a mammalian homolog of Drosophila seven-up, and a chimeric leukemogenic gene, AML1/ETO(MTG8) journal February 1998
Abnormal development of the locus coeruleus in Ear2(Nr2f6)-deficient mice impairs the functionality of the forebrain clock and affects nociception journal March 2005
Loss of the Tumor Suppressor BAP1 Causes Myeloid Transformation journal August 2012
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The Myelodysplastic Syndromes: A Matter of Life or Death journal December 2003
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EVI1 induces myelodysplastic syndrome in mice journal September 2004
Induction of myelodysplasia by myeloid-derived suppressor cells journal October 2013
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EVI1 induces myelodysplastic syndrome in mice journal August 2005
Involvement and functional impairment of the CD34+CD38−Thy-1+ hematopoietic stem cell pool in myelodysplastic syndromes with trisomy 8 journal July 2002
Engraftment of NOD/SCID-β2 microglobulin null mice with multilineage neoplastic cells from patients with myelodysplastic syndrome journal June 2004
Engraftment of distinct clonal MDS-derived hematopoietic precursors in NOD/SCID-β2-microglobulin-deficient mice after intramedullary transplantation of hematopoietic and stromal cells journal October 2004
NUP98-HOXD13 transgenic mice develop a highly penetrant, severe myelodysplastic syndrome that progresses to acute leukemia journal July 2005
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Myelodysplastic syndromes journal May 2008
Revisiting the case for genetically engineered mouse models in human myelodysplastic syndrome research journal August 2015
Intramedullary apoptosis of hematopoietic cells in myelodysplastic syndrome patients can be massive: apoptotic cells recovered from high-density fraction of bone marrow aspirates journal August 2000
Isolation and characterization of hematopoietic progenitor/stem cells in 5q-deleted myelodysplastic syndromes: evidence for involvement at the hematopoietic stem cell level journal September 2000
Generation of high-titer viral preparations by concentration using successive rounds of ultracentrifugation journal August 2011
Myelodysplastic Syndromes journal December 2004
Research Resource: Nuclear Receptors as Transcriptome: Discriminant and Prognostic Value in Breast Cancer journal February 2013
Engineering mouse models with myelodysplastic syndrome human candidate genes; how relevant are they? journal October 2012
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Targeting the orphan nuclear receptor NR2F6 in T cells primes tumors for immune checkpoint therapy journal January 2020