Summary
Growth of the MCF-7, T47D, and ZR-75-1 human breast cancer cells was established in a serum-free defined medium (MOM-1) composed of a 1∶1 (vol/vol) mixture of Ham's F12 medium and Dulbecco's modified Eagle's medium containing 15 mM HEPES (pH 7.2), 2 mM 1-glutamine, 20 μg/ml glutathione, 10 μg/ml insulin, 10 μg/ml transferrin (Tf), 10 ng/ml selenous acid, 0.3 nM triiodothyronine, 50 μg/ml ethanolamine, 20 ng/ml epidermal, growth factor, 2.0 nM 17β-estradiol, and 1.0 mg/ml bovine serum albumin (BSA). Proliferation in MOM-1 was 50 to 70% of the serum stimulated rate. Deletion of components from MOM-1 gave a medium (Tf-BSA) containing only HEPES, 10 μg/ml Tf, and 200 μg/ml BSA, which sustained MCF-7 and T47D cells in a slowly dividing and mitogen responsive state; ZR-75-1 cells required Tf plus 1.0 mg/ml BSA. In Tf-BSA, insulin and insulin-like growth factor I(IGF-I) were mitogenic with ED50 values of 2 to 3 ng/ml and 30 to 150 pg/ml, respectively, with MCF-7 cells. The T47D cells were responsive to these factors in Tf-BSA but required 10-fold higher concentrations for ED50. At saturating concentrations, insulin and IGF-I promoted 1.5 to 3.5 cell population doublings over controls in 8 d. At≤ng/ml concentrations, epidermal growth factor, insulin-like growth factor II, and basic fibroblast growth factor were mitogenic for human breast cancer cells in Tf-BSA. Mitogen activities in uterus and pituitary extracts were assayed readily in Tf-BSA. This new method offers a convenient means of comparing the potencies of growth-promoting factors on human breast cancer cells without interfering activities known to be present in serum.
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This work was supported by grants CA-38024 and CA-26617, from the National Cancer Institute, Bethesda, MD, and by American Cancer Society grant BC-255 and grant 2225 from the Council for Tobacco Research, USA, Inc.
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Ogasawara, M., Sirbasku, D.A. A new serum-free method of measuring growth factor activities for human breast cancer cells in culture. In Vitro Cell Dev Biol 24, 911–920 (1988). https://doi.org/10.1007/BF02623902
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DOI: https://doi.org/10.1007/BF02623902