Kinetics of the Clonal Proliferation of Granulocytes and Macrophages in Cultures of Mouse Bone Marrow Cells as Supported by Two Distinct Types of Colony-Stimulating Factors

摘要

References(11) Two different types of colony-stimulating factors (CSF) were used to support the clonal growth of myeloid progenitor cells (CFUC) in semi-solid agar or viscous methylcellulose cultures of mouse bone marrow cells. The cultures stimulated for 5 days with RSP-2•P3 cell CSF (CSFRSP) contained mainly granulocyte colonies, whereas the cultures stimulated for 10 days with human urine CSF (CSFhu) contained mainly monocyte/macro-phage colonies. Four lines of study were carried out : 1) a kinetic study using combinations of the two types of CSFS in the same culture; 2) a study of transferring CFUC from the initial 3-day cultures to recipient cultures con-taining the same or different types of CSF; 3) an examination of the morpholo-gy over time of colonies that were confined by glass capillaries plunged in agar; and 4) electron microscopic observations on disintegrating granulocytes. The results of all these lines of study suggest that about one third of the CFUC can be stimulated both by CSFRSP and CSFhu while the other two thirds react specifically either with CSFRSP or with CSFhu. The present study also suggests that granulocytes in the culture stop proliferation and disintegrate while macrophages are still growing there. Thus, mixed-type colonies con-taining both macrophages and granulocytes later become macrophage colonies.