Journal
EXPERIMENTAL HEMATOLOGY
Volume 44, Issue 10, Pages 895-901Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.exphem.2016.06.253
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Funding
- National Institutes of Health [HL076604, DK077762, AG040118]
- Deutsche Forschungsgemeinschaft (DFG) [SFB 1074, 1149, KF0142]
- German Federal Ministry of Education and Research (BMBF: SyStaR) [0315894A]
- Excellence program of the Baden-Wurttemberg Foundation
- German Scholar organization (GSO)
- European Commission [316964]
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Aging in the hematopoietic system and the stem cell niche contributes to aging-associated phenotypes of hematopoietic stem cells (HSCs), including leukemia and aging-associated immune remodeling. Among others, the DNA damage theory of aging of HSCs is well established, based on the detection of a significantly larger amount of gamma H2AX foci and a higher tail moment in the comet assay, both initially thought to be associated with DNA damage in aged HSCs compared with young cells, and bone marrow failure in animals devoid of DNA repair factors. Novel data on the increase in and nature of DNA mutations in the hematopoietic system with age, the quality of the DNA damage response in aged HSCs, and the nature of gamma H2AX foci question a direct link between DNA damage and the DNA damage response and aging of HSCs, and rather favor changes in epigenetics, splicing-factors or three-dimensional architecture of the cell as major cell intrinsic factors of HSCs aging. Aging of HSCs is also driven by a strong contribution of aging of the niche. This review discusses the DNA damage theory of HSC aging in the light of these novel mechanisms of aging of HSCs. Copyright (C) 2016 ISEH - International Society for Experimental Hematology. Published by Elsevier Inc.
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