Imaging hematopoietic precursor division in real time
- PMID: 18345353
- PMCID: PMC2267762
- DOI: 10.1016/j.stem.2007.08.009
Imaging hematopoietic precursor division in real time
Abstract
Stem cells are thought to balance self-renewal and differentiation through asymmetric and symmetric divisions, but whether such divisions occur during hematopoietic development remains unknown. Using a Notch reporter mouse, in which GFP acts as a sensor for differentiation, we image hematopoietic precursors and show that they undergo both symmetric and asymmetric divisions. In addition we show that the balance between these divisions is not hardwired but responsive to extrinsic and intrinsic cues. Precursors in a prodifferentiation environment preferentially divide asymmetrically, whereas those in a prorenewal environment primarily divide symmetrically. Oncoproteins can also influence division pattern: although BCR-ABL predominantly alters the rate of division and death, NUP98-HOXA9 promotes symmetric division, suggesting that distinct oncogenes subvert different aspects of cellular function. These studies establish a system for tracking division of hematopoietic precursors and show that the balance of symmetric and asymmetric division can be influenced by the microenvironment and subverted by oncogenes.
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Comment in
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Asymmetric cell division in normal and malignant hematopoietic precursor cells.Cell Stem Cell. 2007 Nov;1(5):479-81. doi: 10.1016/j.stem.2007.10.016. Cell Stem Cell. 2007. PMID: 18938740 No abstract available.
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