title: Reproducible generation of autonomous malignant sublines from non-tumorogenic murine interleukin 3-dependent mast cell lines.
abstract: Murine interleukin 3 (IL-3)-dependent permanent mast cell lines derived from normal mouse bone marrow were established using pokeweed mitogen-stimulated spleen cell conditioned medium (SCM) as a source of IL-3. When propagated continuously in media containing a high concentration of IL-3 (20% SCM or 20 U/ml murine recombinant IL-3 (rIL-3], all the cell lines remained strictly factor-dependent in vitro and non-tumorogenic in vivo. However, we were able to reproducibly generate autonomous sublines from cultures supplemented with low amounts of IL-3 (1% SCM or 2 U/ml rIL-3). Abrogation of exogeneous growth factor dependency was always associated with neoplastic transformation. In newly generated autonomous sublines an autocrine mechanism of growth regulation was evident in vitro.
mesh_terms: D000818:Animals; D002460:Cell Line; D002471:Cell Transformation, Neoplastic; D007377:Interleukin-3; D008407:Mast Cells / Q000473:pathology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H
chemical_list: D007377:Interleukin-3