title: Peritoneal exudate cells. IV. Characterization of colony forming cells.
abstract: The adherence, phagocytic activity and buoyant density of mouse peritoneal exudate colony forming units (CFU-PE) were investigated. There was a significant enrichment in the proportion of CFU-PE in the adherent cells population, defined as cells adhering to a plastic surface within 30 minutes of incubation. The phagocytic activity of CFU-PE was studied by incubating exudate cells with iron particles for 45 minutes. The cells were then separated into phagocytic and non-phagocytic cell fractions by passing the incubation mixture through a magnetic field. A significant enrichment of CFU-PE was seen in the phagocytic cell fraction. When exudate cells were fractionated in a Ficoll discontinuous density gradient, more than 88% of CFU-PE were recovered at the 16/18% and 18/20% interfaces. It is concluded that CFU-PE are adherent cells, have strong phagocytic activity and have a buouant density between 1.0562 and 1.0703. When bone marrow cells were studied by these techniques, the committed stem cells for both granulocytes and marcophages (CFU-C) were enriched in both non-adherent cell and non-phagocytic cells populations. In the Ficoll density gradient, CFU-C banded at a heavier density region than CFU-PE.
mesh_terms: D000818:Animals; D001202:Ascitic Fluid / Q000166:cytology*; D001853:Bone Marrow / Q000502:physiology; D001854:Bone Marrow Cells; D002448:Cell Adhesion; D002455:Cell Division; D002499:Centrifugation, Density Gradient; D005260:Female; D005269:Femur; D008214:Lymphocytes / Q000502:physiology*; D008264:Macrophages / Q000502:physiology*; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D010587:Phagocytosis