title: Effects of B cell stimulatory factor-1/interleukin 4 on hematopoietic progenitor cells.
abstract: B cell stimulatory factor-1 (BSF-1)/Interleukin 4 (IL 4) is a T cell product originally characterized on the basis of its actions on B lymphocytes. Recently it has been reported that BSF-1 activates T cell and mast cell lines. We now provide evidence that BSF-1, purified to homogeneity, also has a broad spectrum of activity on hematopoietic progenitor cells (HPC). However, like its action on B cells, prolierative effects were only observed when BSF-1 was combined with an additional factor. Thus BSF-1, in costimulation with recombinant G-CSF, enhances the proliferation of granulocyte-macrophage progenitor cells (CFU-GM). BSF-1 increases the proliferation of CFU-e in the presence of recombinant erythropoietin (rEPO). Furthermore, BSF-1 induces, together with rEPO, colony formation by primitive erythroid (BFU-e) and multipotent (CFU-mix) progenitor cells comparable to that observed with rEPO and interleukin 3 (IL 3). BSF-1 is also active as a megakaryocyte colony-stimulating factor; in combination with recombinant interleukin 1, rEPO or the supernatant of the T cell hybridoma FS7-20.6.18, BSF-1 induces megakaryocyte colony formation (CFU-Mk). The same factors that synergize with BSF-1 also enhance CFU-Mk proliferation induced by IL 3. Although the precise mechanisms of action of BSF-1 on HPC is not yet known, we propose that BSF-1 represents an activation factor for HPC and prepares the progenitor cells to respond to specific growth or differentiation factors.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D003114:Colony-Forming Units Assay; D003115:Colony-Stimulating Factors / Q000494:pharmacology; D004912:Erythrocytes / Q000166:cytology / Q000187:drug effects; D004921:Erythropoietin / Q000494:pharmacology; D005260:Female; D006098:Granulocytes / Q000166:cytology / Q000187:drug effects; D006133:Growth Substances / Q000494:pharmacology*; D006412:Hematopoietic Stem Cells / Q000187:drug effects*; D007377:Interleukin-3 / Q000494:pharmacology; D015847:Interleukin-4; D008222:Lymphokines / Q000494:pharmacology*; D008264:Macrophages / Q000166:cytology / Q000187:drug effects; D008533:Megakaryocytes / Q000166:cytology / Q000187:drug effects; D051379:Mice; D008807:Mice, Inbred BALB C; D013601:T-Lymphocytes / Q000187:drug effects / Q000254:growth & development
chemical_list: D003115:Colony-Stimulating Factors; D006133:Growth Substances; D007377:Interleukin-3; D008222:Lymphokines; D004921:Erythropoietin; D015847:Interleukin-4