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- W4253483619 abstract "Abstract Human myeloid leukemia cells (HL60) and malignant lymphocytes (Namalwa) were grown in protein-free, Fe-supplemented media and used to study growth responses to insulin and insulin-like growth factor 1 (IGF-I). HL60 cells previously grown in serum-free medium containing microgram quantities of insulin showed an 18-fold reduction in cumulative cell production when grown without insulin. However, the same cells showed reduced or absent growth stimulation with 1 to 100 ng/mL insulin or IGF- I for at least four days following insulin deprivation, indicating that culture conditions modified insulin and IGF-I responses. When the same cells were grown in Fe-supplemented, protein-free medium (RPMI-Fe), insulin and IGF-I caused dose-dependent stimulation of HL60 cell growth with half-maximal stimulation at nanogram concentrations. Namalwa cells grown in protein-free medium showed no response to either hormone. Radioligand binding showed the presence of insulin and IGF-I receptors on both HL60 and Namalwa cells grown in RPMI-Fe. HL60 cells grown in fetal bovine serum had higher, and cells grown with microgram quantities of insulin dramatically reduced, insulin binding. Competitive binding studies and cultures with anti-IGF-I receptor antibody showed insulin and IGF-I stimulated growth through their respective specific receptors. Both insulin and IGF-I stimulate growth of some cultured human leukemia cells, but the presence of insulin or IGF-I receptors alone does not predict growth responses. Culture conditions affect both cellular responses and ligand binding by these hormones and must be closely controlled to study growth responses." @default.
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- W4253483619 date "1988-07-01" @default.
- W4253483619 modified "2023-10-17" @default.
- W4253483619 title "Effects of insulin and insulin-like growth factor I on growth of human leukemia cells in serum-free and protein-free medium" @default.
- W4253483619 doi "https://doi.org/10.1182/blood.v72.1.66.66" @default.
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