6533b7cffe1ef96bd1258ee0
RESEARCH PRODUCT
The severe phenotype of Diamond-Blackfan anemia is modulated by heat shock protein 70.
Narla MohandasHélène MonizHélène MonizMichael DussiotCarmen GarridoSarah RioSarah RioNarjesse KarboulNarjesse KarboulOlivier HermineMarc GastouMarc GastouJérôme LargheroLydie Da CostaMargaux SevinThierry LeblancEric SolaryEric SolaryPatrick GoninWilliam VainchenkerWilliam VainchenkerAnupama Narlasubject
0301 basic medicinecongenital hereditary and neonatal diseases and abnormalitiesIdentificationApoptosis-Inducing FactorGata1 MutationsInhibits ApoptosisBiologyHsp7003 medical and health sciencesGermline mutationRed Cells Iron and Erythropoiesishemic and lymphatic diseasesmedicine[ SDV.MHEP.HEM ] Life Sciences [q-bio]/Human health and pathology/HematologyNuclear ImportErythropoiesisDiamond–Blackfan anemiaHuman ErythroblastsBone marrow failure[SDV.MHEP.HEM]Life Sciences [q-bio]/Human health and pathology/HematologyGATA1Hematologymedicine.diseasePhenotypeMolecular biology3. Good healthHsp70030104 developmental biologyRibosomal-ProteinsProtein Gene DeletionsErythropoiesisHaploinsufficiencydescription
International audience; Diamond-Blackfan anemia (DBA) is a rare congenital bone marrow failure syndrome that exhibits an erythroid-specific phenotype. In at least 70% of cases, DBA is related to a haploinsufficient germ line mutation in a ribosomal protein (RP) gene. Additional cases have been associated with mutations in GATA1. We have previously established that the RPL11+/Mut phenotype is more severe than RPS19+/Mut phenotype because of delayed erythroid differentiation and increased apoptosis of RPL11+/Mut erythroid progenitors. The HSP70 protein is known to protect GATA1, the major erythroid transcription factor, from caspase-3 mediated cleavage during normal erythroid differentiation. Here, we show that HSP70 protein expression is dramatically decreased in RPL11+/Mut erythroid cells while being preserved in RPS19+/Mut cells. The decreased expression of HSP70 in RPL11+/Mut cells is related to an enhanced proteasomal degradation of polyubiquitinylated HSP70. Restoration of HSP70 expression level in RPL11+/Mut cells reduces p53 activation and rescues the erythroid defect in DBA. These results suggest that HSP70 plays a key role in determining the severity of the erythroid phenotype in RP-mutation–dependent DBA.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-10-10 | Blood advances |