Transferrin protein and iron uptake by cultured hepatocytes |
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Authors: | Jean-Claude Sibille Jean-Noël Octave Yves-Jacques Schneider Andr Trouet Robert R Crichton |
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Institution: | Laboratoire de Chimie Physiologique, Université de Louvain, Belgium;International Institute of Cellular and Molecular Pathology, Avenue Hippocrate, 75, B-1200 Bruxelles, Belgium |
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Abstract: | The binding and uptake of 59Fe-loaded 3H-labelled rat transferrin by cultured rat hepatocytes was investigated. At 4°C, there is no evidence for a specific binding of transferrin which could be related to the association of neo-synthesized transferrin with plasma membrane receptors. At 37°C, iron uptake is much more important than transferrin uptake; it proceeds linearly over the time of incubation, is largely proportional to the extracellular transferrin concentration, and is compatible with uptake by fluid phase endocytosis. The difference observed between iron and transferrin uptake implies the existence of a mechanism allowing the reutilization of transferrin after iron delivery. |
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Keywords: | Transferrin Iron Uptake Binding Cultured hepatocytes |
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