• 1 January 1985
    • journal article
    • research article
    • Vol. 65  (2) , 357-362
Abstract
Cells of the Multi-CSF [colony stimulating factor] (IL-3)-dependent hemopoietic cell line 32D c13 formed colonies of varying size in agar cultures stimulated by Multi-CSF. Colony formation was linear with respect to cultured cell numbers; colony numbers and size increased with increasing concentrations of Multi-CSF, and 32D colonies themselves contained a high frequency of clonogenic cells. Clonogenic 32D cells died in the absence of Multi-CSF (half-life 6 h), and most were unable to complete cell cycles in progress at the time of withdrawal of Multi-CSF. The concentration of Multi-CSF directly influenced the length of the cell cycle of dividing 32D cells. Purified GM [granulocyte-macrophage]-CSF, G [granulocyte]-CSF, or M-CSF [macrophage] had no capacity to support the survival or proliferation of 32D cells. Colonies formed by 32D cells appear to offer a useful model for analyzing the action of Multi-CSF in controlling self-renewal by clonogenic hemopoietic cells.

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