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

Pauline Rimmelé, Carolina L. Bigarella, Raymond Liang, Brigitte Izac, Rebeca Dieguez-Gonzalez, Gaetan Barbet, Michael Donovan, Carlo Brugnara, Julie M. Blander, David A. Sinclair, Saghi Ghaffari

Research output: Contribution to journalArticlepeer-review

89 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)44-59
Number of pages16
JournalStem Cell Reports
Volume3
Issue number1
DOIs
StatePublished - Jul 8 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Genetics
  • Developmental Biology
  • Cell Biology

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