Volume 5.13 | Apr 8

Hematopoiesis News 5.13 April 8th, 2014
Hematopoiesis News
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Abnormal Blood Stem Cells Reprogram Their Environment
In patients with a myelodysplastic disorder, defective stem cells reprogram their neighbors in the marrow to create a “niche” that promotes their own survival. Scientists suggest that blocking the molecules involved in this process may lead to an effective therapy against this life-threatening blood disorder. [Press release from the German Research Cancer Center (DKFZ) discussing online prepublication in Cell Stem Cell]
Press Release | Abstract | Graphical Abstract
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PUBLICATIONS (Ranked by impact factor of the journal)

A Single Oncogenic Enhancer Rearrangement Causes Concomitant EVI1 and GATA2 Deregulation in Leukemia
AML with inv(3)/t(3;3) is associated with aberrant expression of the stem-cell regulator EVI1. Applying functional genomics and genome-engineering, scientists demonstrated that both 3q rearrangements reposition a distal GATA2 enhancer to ectopically activate EVI1 and simultaneously confer GATA2 functional haploinsufficiency, previously identified as the cause of sporadic familial AML/MDS and MonoMac/Emberger syndromes. [Cell] Abstract | Graphical Abstract

Analysis of the DNA Methylome and Transcriptome in Granulopoiesis Reveal Timed Changes and Dynamic Enhancer Methylation
Scientists characterized changes in DNA methylation and gene expression during granulopoiesis using four distinct cell populations ranging from the oligopotent common myeloid progenitor stage to terminally differentiated neutrophils. [Blood] Abstract | Press Release

JAK2V617F-Homozygosity Drives a Phenotypic Switch between Myeloproliferative Neoplasms in a Murine Model, but Is Insufficient to Sustain Clonal Expansion
Researchers provided direct genetic evidence and demonstrated that homozygosity for human JAK2V617F in knock-in mice results in a striking phenotypic switch from an essential thrombocythemia-like to polycythemia vera-like phenotype. The resultant erythrocytosis is driven by increased numbers of early erythroid progenitors and enhanced erythroblast proliferation whereas reduced platelet numbers are associated with impaired platelet survival. [Blood] Abstract

CD44 Standard and CD44v10 Isoform Expression on Leukemia Cells Distinctly Influences Niche Embedding of Hematopoietic Stem Cells
A blockade of CD44 is considered a therapeutic option for the elimination of leukemia initiating cells. However, anti-panCD44 can interfere with hematopoiesis. Therefore, investigators explored whether a CD44 variant isoform (CD44v)-specific antibody can inhibit leukemia growth without attacking hematopoiesis. [J Hematol Oncol]
Full Article

Stem and Progenitor Cell Subsets Are Affected by JAK2 Signaling and Can Be Monitored by Flow Cytometry
Investigators analyzed hematopoietic stem cell subsets with a series of stem cell markers in JAK2V617F transgenic mice, where the mutation is sufficient to cause myeloproliferative neoplasia with lymphocyte deficiency. [PLoS One] Full Article

Overexpression of miR-125a in Myelodysplastic Syndrome CD34+ Cells Modulates NF-κB Activation and Enhances Erythroid Differentiation Arrest
The authors studied the role of miR-125a/miR-125b in myelodysplastic syndromes (MDS) and their relationship with toll-like receptor (TLR) signaling and hematopoietic differentiation. Their results indicate that miR-125a is significantly overexpressed in MDS patients and correlates negatively with patient survival. [PLoS One]
Full Article


The Prognostic Impact of Minimal Residual Disease in Patients with Chronic Lymphocytic Leukemia Requiring First-Line Therapy
Researchers retrospectively evaluated the impact of minimal residual disease on the outcome of 255 consecutive patients receiving any frontline therapy in the context of a detailed prognostic evaluation, including IGHV, TP53, NOTCH1 and SF3B1 mutations. [Haematologica] Abstract | Full Article

Extramedullary Relapse of Acute Leukemia after Allogeneic Hematopoietic Stem Cell Transplantation: Different Characteristics between Acute Myeloid Leukemia and Acute Lymphoblastic Leukemia
In order to investigate the incidence, risk factor and clinical outcome of extramedullary relapse for acute myeloid leukemia and acute lymphoblastic leukemia, scientists performed a retrospective analysis on 362 patients with acute leukemia who underwent allogeneic hematopoietic stem cell transplantation. [Biol Blood Marrow Transplant] Abstract

Free Nature Reviews Immunology Poster: The Immune Response to HIV
Mesenchymal Stromal Cells in the Antimicrobial Host Response of Hematopoietic Stem Cell Recipients with Graft-versus-Host Disease – Friends or Foes?
The authors focus on the available data from in vitro studies and animal models regarding the interaction of mesenchymal stromal cells (MSCs) with bacterial, viral, and fungal pathogens. In a clinical part, they present the current information on infectious complications in allogeneic hematopoietic stem cell transplantation recipients who had received MSCs as prophylaxis or treatment of graft-versus-host disease. [Leukemia] Abstract

Thioredoxin-Interacting Protein, Hematopoietic Stem Cells, and Hematopoiesis
Thioredoxin-interacting protein (TXNIP) is expressed in hematopoietic stem cells (HSCs), and its expression decreases as HSCs differentiate into precursor cells. However, this reduction in expression does not sufficiently explain the function of TXNIP in hematopoietic cells under oxidative stress conditions. The authors review how reactive oxygen species can regulate hematopoiesis by focusing on the function of TXNIP in hematopoietic cells under oxidative stress conditions. [Curr Opin Hematol] Abstract

Visit our reviews page to see a complete list of reviews in the hematopoiesis research field.

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Agios Announces Initial Phase I Data Demonstrating Clinical Activity of AG-221, First-in-Class Inhibitor of IDH2 Mutations, in Patients with Advanced Blood Cancers
Agios Pharmaceuticals, Inc. announced that data from its lead, first-in-class program AG-221 was presented. The preliminary data demonstrates the clinical activity, tolerability and unique mechanism of action of AG-221 in patients with advanced hematologic malignancies with an isocitrate dehydrogenase-2 (IDH2) mutation. [Press release from Agios Pharmaceuticals, Inc. discussing research presented at the American Association for Cancer Research (AACR) Annual Meeting 2014, San Diego] Press Release

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Baxter to Acquire Chatham Therapeutics
Baxter International Inc. and Chatham Therapeutics, LLC announced that Baxter has agreed to acquire all of Chatham’s outstanding membership interests. As a result of the transaction, Baxter will acquire Chatham’s developmental gene therapy programs directed toward the development and commercialization of treatments for hemophilia. [Baxter International Inc.] Press Release

Ambit Announces Initiation of Phase II Cohort in MD Anderson Sponsored Study of Quizartinib in AML and High Risk MDS
Ambit Biosciences announced the initiation of the Phase II cohort of the MD Anderson Cancer Center-sponsored Phase I/II study of quizartinib in combination with either 5-azacitidine or low dose cytarabine for previously untreated FLT3-ITD positive acute myeloid leukemia (AML) patients age 60 or older, or FLT3-ITD positive AML patients 18 years of age or older in first relapse. [Ambit Biosciences Corporation] Press Release
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Center for Biologics Evaluation and Research (United States)

European Medicines Agency (European Union)

Medicines and Healthcare Products Regulatory Agency (United Kingdom)

Therapeutic Goods Administration (Australia)
NEW Future Investigators of Regenerative Medicine (FIRM) Symposium 2014
September 8-11, 2014
Girona, Spain

Visit our events page to see a complete list of events in the hematopoiesis research community.
NEW Postdoctoral Researcher – Regulation of Lymphoid Development (Lund University)

NEW MSc & PhD Positions – Cell Biology, Neurobiology, Neuroimmunology, Cancer Biology, Computational Biology (Hanyang University)

Research Associate – Hematology/Oncology (University of Chicago)

Postdoctoral Fellow – Hematopoietic Stem Cell and Leukemia Research (City of Hope)

Postdoctoral Position – Immunotherapies for Cancer Based on Genetic Engineered T Lymphocytes and/or Hematopoietic Stem Cells (Roswell Park Cancer Institute)

Postdoctoral Fellow – Mammalian Hematopoietic and Erythroid Development (The Icahn School of Medicine at Mount Sinai)

Director of GMP/GLP Quality Operations (University of Pennsylvania, Perelman School of Medicine)

Postdoctoral Position – Human Stem Cell Biology and Hematopoiesis (Johns Hopkins University School of Medicine)

Postdoctoral Position – Genes that Regulate Hematopoietic Stem Cells (University of Chicago)

Research Associate – Cell Separation (STEMCELL Technologies Inc.)

Research Technologist – Pluripotent Stem Cells (STEMCELL Technologies Inc.)

Research Technologist – Particle Chemistry (STEMCELL Technologies Inc.)

Research Technologist – PSC Biology and Bioengineering (STEMCELL Technologies Inc.)

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