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Human bone marrow precursor cells

ABSTRACT: The aim of this study was to characterize in vivo miRNA expression in normal myeloid development of the neutrophil granulocyte (granulopoiesis) to gain insight into miRNA control of these processes. Cell populations highly enriched in precursors from successive stages of granulopoiesis and mature neutrophils were isolated from bone marrow (BM) and peripheral blood (PB) samples, respectively, from 4 healthy human donors. Total RNA was extracted from each cell population and subjected to miRNA gene expression profiling using miRCURYTM LNA microRNA Arrays

ORGANISM(S): Mus musculus Human gammaherpesvirus 8 Rattus norvegicus JC polyomavirus Betapolyomavirus macacae Homo sapiens Human immunodeficiency virus 1 Murid gammaherpesvirus 4 Human betaherpesvirus 5 Betapolyomavirus hominis Human alphaherpesvirus 1 human gammaherpesvirus 4 Murid betaherpesvirus 1

PROVIDER: GSE33140 | GEO | 2011/10/22

SECONDARY ACCESSION(S): PRJNA149387

REPOSITORIES: GEO

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Human bone marrow precursor cells

Project description:The aim of this study was to characterize in vivo miRNA expression in normal myeloid development of the neutrophil granulocyte (granulopoiesis) to gain insight into miRNA control of these processes. Cell populations highly enriched in precursors from successive stages of granulopoiesis and mature neutrophils were isolated from bone marrow (BM) and peripheral blood (PB) samples, respectively, from 4 healthy human donors. Total RNA was extracted from each cell population and subjected to miRNA gene expression profiling using miRCURYTM LNA microRNA Arrays Total RNA from cell populations highly enriched in precursors from three succesive stages of neutrophil granulopoiesis and mature neutrophils isolated from bone marrow and peripheral blood, respectively, from four healthy donors (SKP, AJ, AO, JO). The three cell populations from bone marrow where extracted and named B3, B2, and B1, corresponding to immature (myeloblasts [MBs] and promyelocytes [PMs]); intermediate mature (myelocytes [MCs] and metamyelocytes [MMs]); and mature neutrophil cells (band cells [BCs] and segmented neutrophil cells [SCs]), respectively, as described in Bjerregaard MD, Jurlander J, Klausen P, Borregaard N, Cowland JB: The in vivo profile of transcription factors during neutrophil differentiation in human bone marrow. Blood 2003, 101: 4322-4332. In total, 16 samples were compared (4 cell maturation stages from 4 donors)

2011-10-21 | E-GEOD-33140 | biostudies-arrayexpress

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Changes in gene expression during G-CSF-induced emergency granulopoiesis in humans

Project description:Emergency granulopoiesis refers to the increased production of neutrophils in bone marrow and their release into circulation induced by severe infection. Several studies point to a critical role for granulocyte colony-stimulating factor (G-CSF) as the main mediator of emergency granulopoiesis. However, the consequences of G-CSF stimulation on the transcriptome of neutrophils and their precursors have not yet been investigated in humans. Here, we examine the changes in mRNA expression induced by administration of G-CSF in vivo, as a model of emergency granulopoiesis in humans. Blood samples were collected from healthy individuals after five days of G-CSF administration. Neutrophil precursors were sorted into discrete stages of maturation by flow cytometry, and RNA was subjected to microarray analysis. mRNA levels were compared to previously published expression levels in corresponding populations of neutrophil precursors isolated from bone marrow of untreated, healthy individuals. 1110 mRNAs were differentially expressed more than 2-fold throughout terminal granulopoiesis. Major changes were seen in pathways involved in apoptosis, cytokine signaling, and Toll-like receptor pathways. In addition, G-CSF treatment reduced the levels of four out of five measured granule proteins in mature neutrophils including the proantibacterial protein hCAP-18, which was completely deficient in neutrophils from G-CSF-treated donors. These results indicate that multiple biological processes are altered in order to satisfy the increased demand for neutrophils during G-CSF-induced emergency granulopoiesis in humans.

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Project description:Total RNA was isolated from Peripheral blood (PB) and Bone Marrow (BM) samples using mirVana kit and RNA integrity number (RIN) was determined in Agilent Bioanalyzer (2100) to assess the suitability for microarray assays. Fifty samples were individually analyzed using miRCURY™ LNA arrays version 11.0 (Exiqon, Denmark). The LNA array slides were scanned using Agilent G2565BA Microarray Scanner System (Agilent Technologies, Inc., USA) and image analysis was carried out using ImaGene 8.0 software (BioDiscovery, Inc., USA). The quantified signals were background corrected (Normexp with offset value 10 14 and normalized using global Lowess (Locally Weighted Scatterplot Smoothing) regression algorithm.

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