title: Erythroid colony growth in vitro from human peripheral blood null cells: evidence for regulation by T-lymphocytes and monocytes.
abstract: Colony assays in methylcellulose of primitive erythroid precursors (BFU-E) were carried out from the null cell fraction of normal human peripheral blood lymphoid cells. There was little proliferation or maturation of BFU-E as assessed by both the number and the size of colonies formed, when null cells alone were cultured. Culture of null cells with up to 8 X 10(5) autologous T-lymphocytes per ml led to considerable stimulation of colony growth and maturation. Culture of null cells with peripheral blood monocytes also resulted in the indication of BFU-E growth, although the response was inferior to the seen with T-cells. Co-culture of null cells together with both T-cells and monocytes resulted in a uniformly greater response than with either alone, and this was shown to be due to a positive interaction between these two cell types.
mesh_terms: D002455:Cell Division; D002478:Cells, Cultured; D003114:Colony-Forming Units Assay; D004920:Erythropoiesis; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D008214:Lymphocytes / Q000502:physiology*; D008747:Methylcellulose; D009000:Monocytes / Q000502:physiology*; D013601:T-Lymphocytes / Q000502:physiology*
chemical_list: D008747:Methylcellulose