Summary
Four mouse B16 melanoma subclones representing distinct stages in the benign-to-malignant progression of that tumor (G3.15, G3.5, G3.12, and G3.26), and three phenotype conversion variants with enhanced malignancy (G3.15*, G3.5*, and G3.12*), were comparatively examined for exogenous mitogen and growth factor requirements and for responsiveness to exogenous and endogenous growth modulators in monolayer culture. Growth behavior in serum-free medium with or without mitogen or growth factor supplements, and in supplemented quiescent serum-containing medium, confirmed previous indications that the G3.5 and G3.15* phenotypes were identical, as were the G3.26 and G3.12* phenotypes. However, G3.12 differed from the closest conversion equivalent, G3.5*, and probably represents an aberrant phenotype within this sequence. There was a direct relationship between degree of malignancy (G3.15 → G3.5 → G3.5* → G3.26), growth capacity in serum-free medium, and responsiveness to transferrin. Only G3.5*, G3.26, and G3.12* cells were growth-autonomous in serum-free medium and also highly responsive to mitogens. The polypeptide growth factors epidermal growth factor, platelet-derived growth factor, basic fibroblast growth factor, transforming growth factor-α, and insulinlike growth factor-1 and -2 were generally stimulatory in quiescent medium, but the degree of growth promotion was unrelated to malignancy level. Transforming growth factor-β1 was inhibitory to the more benign populations (G3.15, G3.5, and G3.15*) but stimulated proliferation of other cells. All populations produced autocrine fibronectin, and G3.12, G3.5*, G3.26, and G3.12* cells also produced autocrine transferrin. Only G3.12 cells failed to utilize both of those factors. Reversible mitogen-stimulated G3.12 cell growth was accompanied by partial and reversible responsiveness to both autocrine transferrin and fibronectin, whereas permanent stimulation by both factors characterized all growth-autonomous populations.
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Stackpole, C.W., Kalbag, S.S. & Groszek, L. Acquisition of in vitro growth autonomy during B16 melanoma malignant progression is associated with autocrine stimulation by transferrin and fibronectin. In Vitro Cell Dev Biol - Animal 31, 244–251 (1995). https://doi.org/10.1007/BF02639440
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DOI: https://doi.org/10.1007/BF02639440