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Cell competition in hematopoietic cells: Quality control in homeostasis and its role in leukemia.
Developmental Biology 2021 Februrary 28
Cell competition contributes to optimal organ function by promoting tissue homogeneity. In the hematopoietic system, cell competition has been described in two distinct cell populations: in hematopoietic stem cells, and in differentiating T lymphocytes, or thymocytes. In hematopoietic stem cells, cell competition was studied in the context of mild irradiation, whereby the levels of p53 determined the outcome of the cellular interactions and the cells with lower p53 were in advantage. In the thymus, cell competition was addressed in thymus transplantation experiments, and found to be a homeostatic process that contributes to thymus turnover. Cell competition in the thymus depends on the capacity of T lymphocyte precursors to respond to interleukin 7 (IL-7). Failed cell competition permitted thymocyte self-renewal and autonomous thymopoiesis for several weeks, that culminated with leukemia onset. Beyond the work addressing cell competition in these cells, we discuss current hypotheses and observations that could be explained by cell competition. These include the clonal dynamics of hematopoietic stem cells in the ageing organism and initiation of leukemia.
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