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- W128791626 abstract "Abstract Gallium, a pharmacologically important metal, resembles iron with respect to transferrin (Tf) binding and Tf receptor-mediated cellular uptake. In the present study, we examined the effect of gallium on Tf- independent iron uptake by HL60 cells. In contrast to the inhibitory effect of Tf-gallium on Tf-iron uptake, gallium nitrate, in a time-, temperature-, and concentration-dependent manner, stimulated Tf- independent uptake of iron-nitrilotriacetic acid (Fe-NTA). Preexposure of cells to gallium followed by removal of gallium also resulted in sustained stimulation of iron uptake. The anti-Tf receptor monoclonal antibody 42/6 blocked Tf-iron uptake, but had no effect on gallium- induced stimulation of Tf-independent iron uptake. Gallium increased the number of cell membrane iron-binding sites, without a change in their affinity for iron. Ferric chloride stimulated Tf-independent gallium uptake. Although gallium nitrate inhibited cell growth in Tf- free medium, cellular proliferation was restored by Fe-NTA. Gallium and iron appear to share the same Tf-independent cellular uptake system in HL60 cells. Exposure of cells to gallium results in the activation of cell membrane non-Tf iron carriers that may play a role in overcoming the Tf-independent growth-inhibitory effects of gallium." @default.
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- W128791626 date "1992-07-15" @default.
- W128791626 modified "2023-10-14" @default.
- W128791626 title "Regulatory effects of gallium on transferrin-independent iron uptake by human leukemic HL60 cells" @default.
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- W128791626 doi "https://doi.org/10.1182/blood.v80.2.505.505" @default.
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