title: Enhancement of the action of colony stimulating factor (CSF) by soluble component(s) of erythrocytes in mouse bone marrow cells cultures.
abstract: Rat erythrocytes, separated from other blood cells by SE-cellulose chromatography, were lysed by exposure to hypotonic solution, dialyzed and ultracentrifuged. The supernatant contained a substance which enhanced the activity of colony stimulating factor (CSF) in soft agar cultures of granulocyte-macrophage progenitor cells (CFU-C) from normal mouse bone marrow. The growth-enhancing effect of the erythrocyte factor was observed when mouse L-cell conditioned medium was used as the CSF source and also when serum from endotoxin-treated mice or from mice undergoing graft-versus-host reaction was used as the stimulant. The erythrocyte factor effect was also detected by 3H-thymidine uptake of bone marrow cells in liquid cultures. These results suggest that the effect of the erythrocyte factor on CSF is not restricted to CSF from a specific source nor to semi-solid agar cultures.
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D002469:Cell Separation; D002478:Cells, Cultured; D003115:Colony-Stimulating Factors / Q000502:physiology*; D003470:Culture Media; D004912:Erythrocytes / Q000032:analysis*; D006023:Glycoproteins / Q000502:physiology*; D006410:Hematopoiesis; D007739:L Cells / Q000166:cytology; D008297:Male; D051381:Rats
chemical_list: D003115:Colony-Stimulating Factors; D003470:Culture Media; D006023:Glycoproteins