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In vivo and in vitro uptake of ferritin by Langerhans cells of the epidermis.

The uptake of ferritin was studied in human and experimental animal skin to determine the possible role of the Langerhans cell as an epidermal phagocyte. It was demonstrated that Langerhans cells are capable of limited phagocytosis of ferritin particles, but that (1) phagocytosis occurs utilizing phagocytic vacuoles and without apparent relationship to the Langerhans cell granule and (2) epidermal keratinocytes are much more active in phagocytosis of ferritin in both in vivo and in vitro studies than either Langerhans cells or melanocytes. The present findings do not support the hypothesis that the intraepidermal Langerhans cell has a predominately phagocytic function.