Fig. 8.
The distribution of TfRs between cell-surface and intracellular compartments is similar in C282Y and WT cells.
Cell-surface (external) and total cellular Tf binding sites were measured by 125I-Tf binding to C282Y and WT cells at 4°C and 37°C, respectively. Internal (intracellular) Tf binding sites represent the difference between 125I-Tf binding at 37°C and 4°C. The fraction of intracellular 125I-Tf binding sites was also determined by washing cells from the 37°C binding assay with an acidic buffer to remove cell-surface–bound125I-Tf, as discussed in the text. Bars represent means ± SE (n = 4).