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Title

Growth differentiation factor 15 production is necessary for normal erythroid differentiation and is increased in refractory anaemia with ring-sideroblasts

Authors
Cossali, Dominique Anouck
Published in British Journal of Haematology. 2009, vol. 144, no. 2, p. 251-62
Abstract The disturbed erythropoiesis in patients with refractory anaemia with ring-sideroblasts (RARS) is characterized by intramedullary apoptosis of erythroid precursors and increased iron accumulation in mitochondria. To gain insight into these pathophysiological mechanisms we compared the gene expression profile (GEP) of erythroid precursors from RARS patients to the GEP of normal erythroid precursors. Three hundred sixty four probe sets were up-, and 253 probe sets downregulated in RARS cells. Interestingly, Growth Differentiation factor 15 (GDF15), a cytokine from the TGFbeta family, was dramatically upregulated in all RARS patients. Measurement of GDF15 in the sera from twenty RARS patients confirmed this finding by showing significantly, 7.2-fold, increased protein levels (3254 +/- 1400 ng/ml vs. 451 +/- 87 ng/ml in normals). In vitro studies demonstrated erythroid-specific production of GDF15 and dependence on erythropoietin. Induction of apoptosis by arsenic trioxide, a drug which acts via reduction of the mitochondrial membrane potential, also stimulated GDF15 production. Downregulation of endogenous GDF15 production in erythoblasts by specific siRNA led to diminished erythroid differentiation. Taken together, our findings demonstrate a new role for GDF15 in normal erythropoiesis as well as in the ineffective erythropoiesis of RARS patients.
Keywords AgedAged, 80 and overAnemia, Refractory/metabolismAnemia, Sideroblastic/metabolismCase-Control StudiesCell DifferentiationCell Separation/methodsErythroid Precursor Cells/chemistryErythropoiesis/geneticsGene Expression Profiling/methodsGrowth Differentiation Factor 15/analysis/geneticsHumansMiddle AgedOligonucleotide Array Sequence Analysis
Stable URL https://archive-ouverte.unige.ch/unige:1285
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Identifiers
PMID: 19036111
Structures
Research groups Groupe Anselm Wiskott-Susanne Scherrer (315)
Analyses cellulaires et moléculaires des hémopathies malignes (929)

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Deposited on : 2009-04-01

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