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• W3161048064 abstract "Age-related morbidity is associated with a decline in hematopoietic stem cell (HSC) function, but the mechanisms of HSC aging remain unclear. We performed heterochronic HSC transplants followed by quantitative analysis of cell reconstitution. Although young HSCs outperformed old HSCs in young recipients, young HSCs unexpectedly failed to outcompete the old HSCs of aged recipients. Interestingly, despite substantial enrichment of megakaryocyte progenitors (MkPs) in old mice in situ and reported platelet (Plt) priming with age, transplanted old HSCs were deficient in reconstitution of all lineages, including MkPs and Plts. We therefore performed functional analysis of young and old MkPs. Surprisingly, old MkPs displayed unmistakably greater regenerative capacity compared with young MkPs. Transcriptome analysis revealed putative molecular regulators of old MkP expansion. Collectively, these data demonstrated that aging affects HSCs and megakaryopoiesis in fundamentally different ways: whereas old HSCs functionally decline, MkPs gain expansion capacity upon aging." @default.
• W3161048064 created "2021-05-24" @default.
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• W3161048064 date "2021-06-01" @default.
• W3161048064 modified "2023-10-09" @default.
• W3161048064 title "Megakaryocyte progenitor cell function is enhanced upon aging despite the functional decline of aged hematopoietic stem cells" @default.
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• W3161048064 doi "https://doi.org/10.1016/j.stemcr.2021.04.016" @default.
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