Figure 4: The non-transferrin-bound iron (NTBI) uptake activity was increased in PC12 cells treated with Glu. The PC12 cells treated with different concentrations of Glu were incubated with 55FeCl3 iron solution (1.0 μM) for 40 min at 37°C and then the NTBI iron uptake was detected with 55Fe liquid scintillation counting method. All data were expressed as means ± SD. * P<0.05 vs. 0 μM Glu group (n=6). In order to investigate