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Differential cell division history between neutrophils and macrophages in their development from

Yuka Sugimoto1, Naoyuki Katayama, Masahiro Masuya

  • 1Department of Haematology and Oncology, Mie University Graduate School of Medicine, Mie, Japan.

British Journal of Haematology
|November 17, 2006
PubMed

The appearance of monocytes before neutrophils in the blood during haematopoietic recovery in myelosuppressive patients is commonly observed, thus suggesting a difference in the cell division history between these two lineages in the differentiation from granulocyte-macrophage (GM) progenitors. We investigated the cell division histories of murine GM progenitors. When analysed by the dye dilution method, GM progenitors gave rise to Gr-1+Fms+ and Gr-1+Fms- cells that passed through similar rounds of cell division during initial 5 d of culture. The Gr-1+Fms+ cells showed morphological features of monocytes, while Gr-1+Fms- cells exhibited an immature morphology of neutrophils. In the subsequent culture, a decline in the number of Gr-1+Fms+ cells was observed, while Gr-1+Fms- cells increased. The proliferation of Gr-1+Fms- cells and no cell division of Gr-1+Fms+ cells were confirmed by DNA staining, Ki-67 expression, membrane dye staining and bromodeoxyuridine incorporation. These Gr-1+Fms- cells acquired mature neutrophil morphology, whereas Gr-1+Fms+ cells became macrophages. These results demonstrate that GM progenitors generate postmitotic monocytes earlier than mature neutrophils. Our data may also offer one explanation for the rapid recovery of monocytes in comparison with neutrophils in the early phase of haematopoietic regeneration.

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