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(a) Fluorescence images of Caco-2 cells treated with BSA-coated vs. Tf-coated NPs labeled with fluorophore (red); (b) Quantitative analysis of the relative uptake of BSA- vs. Tf-coated NPs; (c) Relative inhibition of NP uptake with specific endocytotic inhibitors (* p<0.05 vs. control); (d) In vitro transepithelial transport of BSA- and Tf-coated NPs, and Tf-coated NPs with free Tf as a competitive blocking agent (n = 4 per group).
