title: The polyclonal B cell activator dextran-sulphate induces formation of colony stimulating activity.
abstract: The effect of dextran-sulphate (DS), a polyclonal activator known to stimulate immature murine B-cells, was assayed in a culture system allowing the growth of myeloid cells. It was known that DS induced the production of a myeloid colony stimulating factor (CSF) by cells from both spleen and bone marrow. Nylonwool purified mouse spleen cells, enriched for T cells, showed a dimished CSF production in response to DS, while CSF production in response to Con A was increased. Furthermore, DS induced CSF in both spleen and bone marrow cells from nude mice. Removal of macrophages did not affect CSF production. The CSF induced was non-dialysable and no small molecular weight or lipoprotein inhibitors could be demonstrated. The results suggest that DS activates cells other than T cells or macrophages (possibly B cells or null cells) to produce a myeloid stem cell stimulating substance. These results indicate that interactions between lymphoid and myeloid cells can take place during differentiation.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D001854:Bone Marrow Cells; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D002999:Clone Cells; D003115:Colony-Stimulating Factors / Q000096:biosynthesis*; D003208:Concanavalin A / Q000494:pharmacology; D004247:DNA / Q000096:biosynthesis; D003911:Dextrans / Q000494:pharmacology*; D006023:Glycoproteins / Q000096:biosynthesis*; D008264:Macrophages / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D003115:Colony-Stimulating Factors; D003911:Dextrans; D006023:Glycoproteins; D003208:Concanavalin A; D004247:DNA