title: Regulation of very primitive, multipotent, hemopoietic cells by hemopoietin-1.
abstract: Hemopoietin-1 (H-1) is known to act synergistically with CSF-1, a mononuclear phagocyte growth factor, to induce the development of primitive hemopoietic cells. To determine whether purified H-1 also acts on multipotent hemopoietic cells, its ability to act synergistically with interleukin-3 (IL-3) and erythropoietin (Epo) was tested in methyl cellulose cultures of murine bone marrow cells. In the presence of IL-3, H-1 increased the number of colonies formed by primitive, multipotent cells by approximately 30-fold. H-1 alone or H-1 plus Epo produced no colonies. Forty percent of the colonies induced by H-1 plus IL-3 contained cells that could be subcultured at least twice, whereas cells from colonies induced by IL-3 alone could not be similarly subcultured. Thus H-1 permits CSF-1 or IL-3 to act on cells more primitive than those acted on by either growth factor alone. The results indicate that H-1 acts on the most primitive hemopoietic cells yet shown to proliferate and differentiate in culture.
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D003114:Colony-Forming Units Assay; D003115:Colony-Stimulating Factors / Q000494:pharmacology; D004357:Drug Synergism; D004921:Erythropoietin / Q000494:pharmacology; D005260:Female; D006133:Growth Substances / Q000494:pharmacology*; D016298:Hematopoietic Cell Growth Factors; D006412:Hematopoietic Stem Cells / Q000187:drug effects*; D007377:Interleukin-3; D008222:Lymphokines / Q000494:pharmacology; D051379:Mice; D008809:Mice, Inbred C3H
chemical_list: D003115:Colony-Stimulating Factors; D006133:Growth Substances; D016298:Hematopoietic Cell Growth Factors; D007377:Interleukin-3; D008222:Lymphokines; D004921:Erythropoietin