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. 1983 Nov;35(1):321-30.
doi: 10.1016/0092-8674(83)90235-0.

Intracellular routing of transferrin and transferrin receptors in epidermoid carcinoma A431 cells

C R Hopkins

Intracellular routing of transferrin and transferrin receptors in epidermoid carcinoma A431 cells

C R Hopkins. Cell. 1983 Nov.

Abstract

Using transferrin peroxidase (Tfn-HRP) and a transferrin receptor-specific antibody complexed to colloidal gold (ATR) we have identified the intracellular compartments concerned with processing internalized transferrin-receptor complexes. We have identified major membrane-bound systems in the peripheral cytoplasm and in the juxtanuclear area, from which components of these complexes are returned to the cell surface. Time course studies indicate that the peripheral system is concerned with a "short circuit," recycling ligand and receptor complexes back to the upper surface of the cell. The juxtanuclear compartment is part of a longer circuit that routes some receptors to the basal surface and others, along with ligand, to the lysosome.

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