Hematopoiesis News Volume 5.29 | Aug 5 2014

D-Cyclins Repress Apoptosis in Hematopoietic Cells by Controlling Death Receptor Fas and Its Ligand FasL
The authors report that D-cyclins perform a rate-limiting antiapoptotic function in vivo. They found that acute shutdown of all three D-cyclins in bone marrow of adult mice resulted in massive apoptosis of all hematopoietic cell types. [Dev Cell] Abstract | Graphical Abstract

Downregulation of Prdm16 mRNA Expression Is a Specific Mechanism to Avoid Leukemogenesis during HOXB4-Mediated HSC Expansion In Vivo
To gain further insight into the molecular events underlying HOXB4-mediated hematopoietic stem cell (HSC) expansion, investigators analyzed gene expression changes at multiple time points in Lin^–Sca1⁺c-kit⁺ cells from mice transplanted with bone marrow cells transduced with a MSCV-HOXB4-ires-YFP vector. [Blood] Abstract

Dynamics of Leukemia Stem-Like Cells Extinction in Acute Promyelocytic Leukemia
Researchers investigated the dynamics of acute promyelocytic leukemia before and during therapy with regard to disease initiation, progression and therapeutic response. [Cancer Res] Abstract

Type II Interferon Promotes Differentiation of Myeloid-Biased Hematopoietic Stem Cells
Researchers report that type II interferon signaling is required, both at baseline and during an animal model of LCMV infection, to maintain normal myeloid development. [Stem Cells] Abstract

Rictor Is Required for Early B Cell Development in Bone Marrow
Scientists demonstrate that the deletion of Rictor induced an aberrant increase in the FoxO1 and Rag-1 proteins in bone marrow (BM) B cells and that this increase was accompanied by a significant decrease in the abundance of B cells in the peripheral blood and the spleen, suggesting impaired development of early B cells in adult mouse BM. [PLoS One] Full Article

Identification of Heme Oxygenase 1 (HO-1) as a Novel Negative Regulator of Mobilization of Hematopoietic Stem/Progenitor Cells
Researchers demonstrate that HO-1 plays an important and heretofore unrecognized role in retention of hematopoietic stem/progenitor cells (HSPCs) in bone marrow (BM) niches by modulating negatively activation of mobilization promoting complement cascade, maintaining stromal derived factor-1 (SDF-1) level in the BM microenvironment and attenuating chemotactic responsiveness of HSPCs to SDF-1 and sphingosine-1 phosphate gradients in peripheral blood. [Stem Cell Rev] Abstract | Full Article

CLINICAL RESEARCH

Transplantation Outcomes for Severe Combined Immunodeficiency, 2000-2009
The Primary Immune Deficiency Treatment Consortium was formed to analyze the results of hematopoietic-cell transplantation in children with severe combined immunodeficiency (SCID) and other primary immunodeficiencies. Researchers collected data retrospectively from 240 infants with SCID who had received transplants at 25 centers during a ten-year period. [N Engl J Med] Abstract | Press Release

Autologous Hematopoietic Stem Cell Transplantation in Neuromyelitis Optica: A Registry Study of the EBMT Autoimmune Diseases Working Party
The European Group for Blood and Marrow Transplantation (EBMT) Autoimmune Diseases Working Party conducted a retrospective survey to analyze disease outcome following autologous stem cell transplantation. [Mult Scler J] Abstract

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GSK and Genmab Announce Positive Interim Result for Phase III Study of Ofatumumab as Maintenance Therapy for Relapsed CLL
GlaxoSmithKline plc and Genmab A/S announced that an Independent Data Monitoring Committee interim analysis of a Phase III study, PROLONG, reached the predefined significance level for efficacy. The study evaluated ofatumumab maintenance therapy versus no further treatment (observation) in patients with relapsed chronic lymphocytic leukemia (CLL) who responded to treatment at relapse. [Genmab A/S] Press Release

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NEW Postdoctoral Positions – Reprogramming and Genetic Engineering Technologies to Develop New Models of Hematopoiesis and Hematopoietic Disorders (Icahn School of Medicine)

Senior Research Fellow/Research Fellow – Hematopoietic and Leukemia Stem Cell Biology (Monash University)

Postdoctoral Position – Molecular Properties of Leukemic Stem Cells (BC Cancer Agency)

Postdoctoral Research Fellow – Molecular Mechanisms Regulating Transformation and Maintenance of Leukemia Stem Cells (City of Hope)

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Biologist – Hypoxia Signaling in Myeloproliferative Neoplasms (University Hospital Aachen)

Scientific Manager – hES and iPS Cell Lines to Model Normal Hematopoiesis and Related Blood Diseases (St. Jude Children’s Research Hospital)

Postdoctoral Research Fellow – Cardiovascular Immunology / Hematology (Massachusetts General Hospital)

Scientist – Pluripotent Stem Cell Media Development, High Throughput Screening (STEMCELL Technologies Inc.)

Scientist – Cell Culture Support Products (STEMCELL Technologies Inc.)

Scientist – Immunology/Cell Separation (STEMCELL Technologies Inc.)

Research Associate – Cell Separation (STEMCELL Technologies Inc.)

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