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The role of apoptosis in regulating hematopoietic stem cell numbers

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Abstract

The importance of apoptosis, in combination with proliferation, in maintaining stable populations has become increasingly clear in the last decade. Perturbation of either of these processes can have serious consequences, and result in a variety of disorders. Moreover, as the players and pathways gradually emerge, it turns out that there are strong connections in the regulation of cell cycle progression and apoptosis. Apoptosis, proliferation, and the disorders resulting from aberrant regulation have been studied in a variety of cell types and systems. Hematopoietic stem cells (HSC) are defined as primitive mesenchymal cells that are capable of both self-renewal and differentiation into the various cell lineages that constitute the functioning hematopoietic system. Many (but certainly not all) mature hematopoietic cells are relatively short-lived, sometimes with a half-life in the order of days. Homeostasis requires the production of 108 (mouse) to 1011 (human) cells each day. All of these cells are ultimately derived from HSC that mostly reside in the bone marrow in adult mammals. The study of the regulation of HSC numbers has focussed mainly on the choice between self-renewal and differentiation, symmetric and asymmetric cell divisions. Recently, however, it has been directly demonstrated that apoptosis plays an important role in the regulation of hematopoietic stem cells in vivo.

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  1. Department of Medicine, Division of Medical Oncology and Transplantation, Duke University Medical Center, Box 3225, Durham, NC, 27710, USA

    Jos Domen

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Domen, J. The role of apoptosis in regulating hematopoietic stem cell numbers. Apoptosis 6, 239–252 (2001). https://doi.org/10.1023/A:1011347623402

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