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Rescue of early-stage myelodysplastic syndrome-deriving erythroid precursors by the ectopic expression of a dominant-negative form of FADD

Myelodysplastic syndromes (MDSs) are characterized by peripheral blood cytopenia including anemia. We have investigated the implication of the extrinsic pathway of apoptosis in MDS-ineffective erythropoiesis by in vitro expansion of erythroid precursors from early stage (low and intermediate-1 Inter...

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Published in:Blood 2005-05, Vol.105 (10), p.4035-4042
Main Authors: Claessens, Yann-Erick, Park, Sophie, Dubart-Kupperschmitt, Anne, Mariot, Virginie, Garrido, Carmen, Chrétien, Stany, Dreyfus, François, Lacombe, Catherine, Mayeux, Patrick, Fontenay, Michaëla
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cited_by cdi_FETCH-LOGICAL-c494t-1250da06666ee35d301f8a3c21a2f8513f7366745af2aafa3a0f8eb6c6fdfc8a3
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creator Claessens, Yann-Erick
Park, Sophie
Dubart-Kupperschmitt, Anne
Mariot, Virginie
Garrido, Carmen
Chrétien, Stany
Dreyfus, François
Lacombe, Catherine
Mayeux, Patrick
Fontenay, Michaëla
description Myelodysplastic syndromes (MDSs) are characterized by peripheral blood cytopenia including anemia. We have investigated the implication of the extrinsic pathway of apoptosis in MDS-ineffective erythropoiesis by in vitro expansion of erythroid precursors from early stage (low and intermediate-1 International Prognosis Scoring System [IPSS]) MDS, advanced stage (intermediate-2 IPSS) MDS, and control bone marrow samples. We have previously shown that Fas and its ligand were overexpressed in early stage MDS erythroid cells. Here, we show that caspase-8 activity is significantly increased, whereas the expression of death receptors other than Fas, including the type 1 receptor for tumor necrosis factor α (TNF-α) and the receptors for the TNF-related apoptosis-inducing ligand (TRAIL), DR4 and DR5, was normal. We also observed that the adapter Fas-associated death domain (FADD) was overexpressed in early stage MDS erythroid cells. Transduction of early stage MDS-derived CD34+ progenitors with a FADD-encoding construct increased apoptosis of erythroid cells and dramatically reduced erythroid burst-forming unit (BFU-E) growth. Transduction of a dominant-negative (dn) mutant of FADD inhibited caspase-8 activity and cell death and rescued BFU-E growth without abrogating erythroid differentiation. These results extend the observation that Fas-dependent activation of caspase-8 accounts for apoptosis of early stage MDS erythroid cells and demonstrate for the first time that FADD is a valuable target to correct ineffective erythropoiesis in these syndromes.
doi_str_mv 10.1182/blood-2004-08-3166
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Transduction of early stage MDS-derived CD34+ progenitors with a FADD-encoding construct increased apoptosis of erythroid cells and dramatically reduced erythroid burst-forming unit (BFU-E) growth. Transduction of a dominant-negative (dn) mutant of FADD inhibited caspase-8 activity and cell death and rescued BFU-E growth without abrogating erythroid differentiation. These results extend the observation that Fas-dependent activation of caspase-8 accounts for apoptosis of early stage MDS erythroid cells and demonstrate for the first time that FADD is a valuable target to correct ineffective erythropoiesis in these syndromes.</abstract><cop>Washington, DC</cop><pub>Elsevier Inc</pub><pmid>15677568</pmid><doi>10.1182/blood-2004-08-3166</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record>
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source ScienceDirect Additional Titles
subjects Adaptor Proteins, Signal Transducing - genetics
Adaptor Proteins, Signal Transducing - metabolism
Adult
Aged
Aged, 80 and over
Apoptosis
Apoptosis Regulatory Proteins
Biological and medical sciences
Caspase 8
Caspases - metabolism
Cell Differentiation
Cells, Cultured
Erythroid Cells - metabolism
Erythroid Cells - pathology
Fas-Associated Death Domain Protein
Female
Gene Expression Regulation, Neoplastic
Genes, Dominant - genetics
Hematologic and hematopoietic diseases
Humans
Leukemias. Malignant lymphomas. Malignant reticulosis. Myelofibrosis
Male
Medical sciences
Membrane Glycoproteins - metabolism
Middle Aged
Myelodysplastic Syndromes - genetics
Myelodysplastic Syndromes - metabolism
Myelodysplastic Syndromes - pathology
Myelodysplastic Syndromes - therapy
Neoplasm Staging
Stem Cells - cytology
Stem Cells - metabolism
TNF-Related Apoptosis-Inducing Ligand
Tumor Necrosis Factor-alpha - metabolism
title Rescue of early-stage myelodysplastic syndrome-deriving erythroid precursors by the ectopic expression of a dominant-negative form of FADD
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