title: Colony formation in agar by adult bone marrow multipotential hemopoietic cells.
abstract: Erythroid colony formation in agar cultures of CBA bone marrow cells was stimulated by the addition of pokeweed mitogen-stimulated spleen conditioned medium (SCM). Optimal colony numbers were obtained when cultures contained 20% fetal calf serum and concentrated spleen conditioned medium. By 7 days of incubation, large burst or unicentric erythroid colonies occurred at a maximum frequency of 40--50 per 10(5) bone marrow cells. In CBA mice the cells forming erythroid colonies were also present in the spleen, peripheral blood, and within individual spleen colonies. A marked strain variation was noted with CBA mice having the highest levels of erythroid colony-forming cells. In CBA mice erythroid colony-forming cells were mainly non-cycling (12.5% reduction in colony numbers after incubation with hydroxyurea or 3H-thymidine). Erythroid colony-forming cells sedimented with a peak of 4..5 mm/hr, compared with CFU-S, which sedimented at 4.25 mm/hr. The addition of erythropoietin (up to 4 units) to cultures containing SCM did not alter the number or degree of hemoglobinisation of erythroid colonies. Analysis of the total number of erythroid colony-forming cells and CFU-S in 90 individual spleen colonies gave a correlation coefficient of r = 0.93 for these two cell types. In addition to benzidine-positive erythroid cells, up to 40% of the colonies contained, in addition, varying proportions of neutrophils, macrophages, eosinophils, and megakaryocytes. Taken together with the close correlation between the numbers of CFU-S in different adult hemopoietic tissues, including individual spleen colonies, the data indicate that the erythroid colony-forming cells expressing multiple hemopoietic differentiation are members of the hemopoietic multipotential stem cell compartment.
mesh_terms: D000818:Animals; D001769:Blood; D002454:Cell Differentiation; D002478:Cells, Cultured; D002999:Clone Cells / Q000166:cytology; D003470:Culture Media; D004912:Erythrocytes / Q000166:cytology*; D004920:Erythropoiesis; D004921:Erythropoietin / Q000494:pharmacology; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D007399:Interphase; D051379:Mice; D008808:Mice, Inbred CBA; D013154:Spleen / Q000166:cytology
chemical_list: D003470:Culture Media; D004921:Erythropoietin