[PDF][PDF] Aging-like phenotype and defective lineage specification in SIRT1-deleted hematopoietic stem and progenitor cells

P Rimmelé, CL Bigarella, R Liang, B Izac… - Stem cell reports, 2014 - cell.com
P Rimmelé, CL Bigarella, R Liang, B Izac, R Dieguez-Gonzalez, G Barbet, M Donovan…
Stem cell reports, 2014cell.com
Aging hematopoietic stem cells (HSCs) exhibit defective lineage specification that is thought
to be central to increased incidence of myeloid malignancies and compromised immune
competence in the elderly. Mechanisms underlying these age-related defects remain largely
unknown. We show that the deacetylase Sirtuin (SIRT) 1 is required for homeostatic HSC
maintenance. Differentiation of young SIRT1-deleted HSCs is skewed toward myeloid
lineage associated with a significant decline in the lymphoid compartment, anemia, and …
Summary
Aging hematopoietic stem cells (HSCs) exhibit defective lineage specification that is thought to be central to increased incidence of myeloid malignancies and compromised immune competence in the elderly. Mechanisms underlying these age-related defects remain largely unknown. We show that the deacetylase Sirtuin (SIRT)1 is required for homeostatic HSC maintenance. Differentiation of young SIRT1-deleted HSCs is skewed toward myeloid lineage associated with a significant decline in the lymphoid compartment, anemia, and altered expression of associated genes. Combined with HSC accumulation of damaged DNA and expression patterns of age-linked molecules, these have striking overlaps with aged HSCs. We further show that SIRT1 controls HSC homeostasis via the longevity transcription factor FOXO3. These findings suggest that SIRT1 is essential for HSC homeostasis and lineage specification. They also indicate that SIRT1 might contribute to delaying HSC aging.
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