ELMO1 is upregulated in AML CD34+ stem/progenitor cells, mediates chemotaxis and predicts poor prognosis in normal karyotype AML

Both normal as well leukemic hematopoietic stem cells critically depend on their microenvironment in the bone marrow for processes such as self-renewal, survival and differentiation, although the exact pathways that are involved remain poorly understood. We performed transcriptome analysis on primit...

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Bibliographic Details
Published in:PloS one 2014-10, Vol.9 (10), p.e111568-e111568
Main Authors: Capala, Marta E, Vellenga, Edo, Schuringa, Jan Jacob
Format: Article
Language:English
Subjects:
Abl protein
Acute myeloid leukemia
Adaptor Proteins, Signal Transducing - metabolism
Analysis
Antigens, CD34
BCR protein
Biology and Life Sciences
Bone marrow
CD34 antigen
Cell Line, Tumor
Cell migration
Cell Proliferation
Cell self-renewal
Cell Survival
Cell Transformation, Neoplastic - metabolism
Cell Transformation, Neoplastic - pathology
Cells (biology)
Chemotaxis
Chromosomes
Cytoskeleton
Depletion
Differentiation
Down-Regulation
Fetal Blood - metabolism
Fusion protein
Fusion Proteins, bcr-abl - metabolism
G proteins
Gene expression
Genes
Granulocytes
Hematology
Hematopoietic stem cells
Humans
Immunoglobulins
Infant, Newborn
Karyotyping
Laboratories
Leukemia
Leukemia, Myeloid, Acute - metabolism
Leukemia, Myeloid, Acute - pathology
Medical prognosis
Medical research
Medicine and Health Sciences
Myeloid leukemia
Neoplastic Stem Cells - metabolism
Neoplastic Stem Cells - pathology
Ovarian cancer
Penicillin
Pharmacology
Progenitor cells
Progeny
Prognosis
Proteins
RNA
SDF-1 protein
Signaling
Stem cells
Survival
Tumor Stem Cell Assay
Up-Regulation
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Summary:Both normal as well leukemic hematopoietic stem cells critically depend on their microenvironment in the bone marrow for processes such as self-renewal, survival and differentiation, although the exact pathways that are involved remain poorly understood. We performed transcriptome analysis on primitive CD34+ acute myeloid leukemia (AML) cells (n = 46), their more differentiated CD34- leukemic progeny, and normal CD34+ bone marrow cells (n = 31) and focused on differentially expressed genes involved in adhesion and migration. Thus, Engulfment and Motility protein 1 (ELMO1) was identified amongst the top 50 most differentially expressed genes. ELMO1 is a crucial link in the signaling cascade that leads to activation of RAC GTPases and cytoskeleton rearrangements. We confirmed increased ELMO1 expression at the mRNA and protein level in a panel of AML samples and showed that high ELMO1 expression is an independent negative prognostic factor in normal karyotype (NK) AML in three large independent patient cohorts. Downmodulation of ELMO1 in human CB CD34+ cells did not significantly alter expansion, progenitor frequency or differentiation in stromal co-cultures, but did result in a decreased frequency of stem cells in LTC-IC assays. In BCR-ABL-transduced human CB CD34+ cells depletion of ELMO1 resulted in a mild decrease in proliferation, but replating capacity of progenitors was severely impaired. Downregulation of ELMO1 in a panel of primary CD34+ AML cells also resulted in reduced long-term growth in stromal co-cultures in two out of three cases. Pharmacological inhibition of the ELMO1 downstream target RAC resulted in a severely impaired proliferation and survival of leukemic cells. Finally, ELMO1 depletion caused a marked decrease in SDF1-induced chemotaxis of leukemic cells. Taken together, these data show that inhibiting the ELMO1-RAC axis might be an alternative way to target leukemic cells.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0111568