Lactating mouse mammary cell uptake of 59Fe-transferrin. The effect of KCN, 2,4-dinitrophenol, ethanol and ATP

Abstract

1. 1. Amounts of KCN of 0.2, 1.0 and 2.0 × 10 −11 mol in a probe do not prevent the uptake of transferrin iron from lactating mouse mammary gland cells. 2. 2. The effect of 5, 10 and 100 × 10 −1 mol in a probe 2.4-dinitrophenol dissolved in 20% ethanol is also negative on the iron-transferrin uptake from the cell. 3. 3. There is a statistically significant decrease of uptake of transferrin-iron under the influence of 20% ethanol in the incubation mixture (25, 50 and 100μ1.). The effect of ethanol is diminished by 2,4-dinitrophenol in the solution. 4. 4. The uptake of 59Fe-transferrin from cells of lactating gland was blocked by ATP (in amounts 0.5, 1.0 and 10.0 × 10 −11 mol per probe) while other concentrations have no effect. It seems that ATP does not release 59Fe from transferrin, nor help the iron uptake from the cells. 5. 5. All evidence indicates that the uptake of transferrin-iron from lactating mammary gland cells is not an energy dependent process.