title: Detection of murine bone marrow granulocyte/macrophage progenitor cells (GM-CFU) in serum-free cultures stimulated with purified M-CSF or GM-CSF.
abstract: Colony formation by mouse granulocyte/macrophage progenitors (GM-CFU) responding to purified colony-stimulating factors (CSF) in serum-free cultures is described. Analysis of the lipid requirements for colony growth stimulated by purified macrophage CSF (M-CSF) demonstrated that cholesterol is essential. Linoleic acid further promoted colony growth only if cholesterol was present, but phospholipid was inhibitory. More colonies were obtained in serum-free cultures, than in serum-supplemented controls. This difference could not be attributed to a change in the range of sensitivity to M-CSF. Stimulation of GM-CFU with granulocyte/macrophage CSF (GM-CSF) required further supplementation with hydrocortisone for optimal expression of colony-forming capacity in serum-free cultures. Hydrocortisone slightly inhibited colony growth stimulated with M-CSF. Under these culture conditions, the number of GM-CFU responding to GM-CSF was twice that obtained with M-CSF.
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D002454:Cell Differentiation / Q000187:drug effects; D002478:Cells, Cultured; D003114:Colony-Forming Units Assay; D003115:Colony-Stimulating Factors / Q000494:pharmacology; D003470:Culture Media; D005260:Female; D006098:Granulocytes / Q000166:cytology*; D006410:Hematopoiesis / Q000187:drug effects; D006854:Hydrocortisone / Q000494:pharmacology; D008264:Macrophages / Q000166:cytology*; D051379:Mice; D010713:Phosphatidylcholines / Q000494:pharmacology
chemical_list: D003115:Colony-Stimulating Factors; D003470:Culture Media; D010713:Phosphatidylcholines; D006854:Hydrocortisone