title: Purification to homogeneity of B cell stimulating factor. A molecule that stimulates proliferation of multiple lymphokine-dependent cell lines.
abstract: Murine B cell stimulating factor 1 (BSF-1) was purified to homogeneity from supernatants of a stimulated thymoma cell line. A protein of 18.4 kD with a unique N-terminal amino acid sequence was identified. BSF-1 had a sp act of at least 3.28 X 10(8) U/mg. In addition to its B cell-stimulatory activity, BSF-1 also stimulated the proliferation of several IL-2- and IL-3-dependent cell lines. We conclude that BSF-1 is both a growth factor and a differentiation factor. Finally, these results also suggest additional biologic properties of BSF-1 on lineages besides B lymphocytes.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001402:B-Lymphocytes / Q000187:drug effects*; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D005260:Female; D006133:Growth Substances / Q000302:isolation & purification* / Q000494:pharmacology; D007376:Interleukin-2 / Q000494:pharmacology; D007377:Interleukin-3; D015847:Interleukin-4; D008213:Lymphocyte Activation / Q000187:drug effects; D008222:Lymphokines / Q000302:isolation & purification* / Q000494:pharmacology; D051379:Mice; D008810:Mice, Inbred C57BL; D013945:Thymoma / Q000032:analysis; D013953:Thymus Neoplasms / Q000032:analysis
chemical_list: D006133:Growth Substances; D007376:Interleukin-2; D007377:Interleukin-3; D008222:Lymphokines; D015847:Interleukin-4