Transferrin endocytosis and iron uptake in developing myogenic cells in culture: Effects of microtubular and metabolic inhibitors, sulphydryl reagents and lysosomotrophic agents

L. M. Sorokin, E. H. Morgan, G. C.T. Yeoh

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    Abstract

    The experiments described in this study were designed to investigate receptor‐mediated endocytosis of transferrin and its role in iron uptake by cultured chick presumptive myoblasts (dividing and non‐dividing) and myotubes. The effects of a variety of inhibitors on the internalization of transferrin and iron were investigated and three main effects were found: (i) sulphydryl reagents and microtubular inhibitors reduced the rate of transferrin and iron internalization to similar degrees, (ii) metabolic inhibitors reduced the rate of iron uptake more than that of transferrin endocytosis, and (iii) lysosomotrophic agents almost completely abolished iron accumulation by the cells without any effect on the rate of transferrin internalization. The results suggest that metabolic energy is required not only for the endocytosis of transferrin but also for subsequent steps in the iron uptake process, and that iron release from transferrin occurs in acidified endosomes. Overall, these experiments show that all or virtually all of the iron taken up by developing muscle cells from transferrin occurs as a consequence of receptor‐mediated endocytosis of the protein.

    Original languageEnglish
    Pages (from-to)483-489
    Number of pages7
    JournalJournal of Cellular Physiology
    Volume137
    Issue number3
    DOIs
    Publication statusPublished - 1 Jan 1988

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    Transferrin
    Endocytosis
    Iron
    Cell Culture Techniques
    Myoblasts
    Endosomes
    Skeletal Muscle Fibers
    Muscle Cells
    Muscle
    Experiments
    Cells

    Cite this

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    title = "Transferrin endocytosis and iron uptake in developing myogenic cells in culture: Effects of microtubular and metabolic inhibitors, sulphydryl reagents and lysosomotrophic agents",
    abstract = "The experiments described in this study were designed to investigate receptor‐mediated endocytosis of transferrin and its role in iron uptake by cultured chick presumptive myoblasts (dividing and non‐dividing) and myotubes. The effects of a variety of inhibitors on the internalization of transferrin and iron were investigated and three main effects were found: (i) sulphydryl reagents and microtubular inhibitors reduced the rate of transferrin and iron internalization to similar degrees, (ii) metabolic inhibitors reduced the rate of iron uptake more than that of transferrin endocytosis, and (iii) lysosomotrophic agents almost completely abolished iron accumulation by the cells without any effect on the rate of transferrin internalization. The results suggest that metabolic energy is required not only for the endocytosis of transferrin but also for subsequent steps in the iron uptake process, and that iron release from transferrin occurs in acidified endosomes. Overall, these experiments show that all or virtually all of the iron taken up by developing muscle cells from transferrin occurs as a consequence of receptor‐mediated endocytosis of the protein.",
    author = "Sorokin, {L. M.} and Morgan, {E. H.} and Yeoh, {G. C.T.}",
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    TY - JOUR

    T1 - Transferrin endocytosis and iron uptake in developing myogenic cells in culture

    T2 - Effects of microtubular and metabolic inhibitors, sulphydryl reagents and lysosomotrophic agents

    AU - Sorokin, L. M.

    AU - Morgan, E. H.

    AU - Yeoh, G. C.T.

    PY - 1988/1/1

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    N2 - The experiments described in this study were designed to investigate receptor‐mediated endocytosis of transferrin and its role in iron uptake by cultured chick presumptive myoblasts (dividing and non‐dividing) and myotubes. The effects of a variety of inhibitors on the internalization of transferrin and iron were investigated and three main effects were found: (i) sulphydryl reagents and microtubular inhibitors reduced the rate of transferrin and iron internalization to similar degrees, (ii) metabolic inhibitors reduced the rate of iron uptake more than that of transferrin endocytosis, and (iii) lysosomotrophic agents almost completely abolished iron accumulation by the cells without any effect on the rate of transferrin internalization. The results suggest that metabolic energy is required not only for the endocytosis of transferrin but also for subsequent steps in the iron uptake process, and that iron release from transferrin occurs in acidified endosomes. Overall, these experiments show that all or virtually all of the iron taken up by developing muscle cells from transferrin occurs as a consequence of receptor‐mediated endocytosis of the protein.

    AB - The experiments described in this study were designed to investigate receptor‐mediated endocytosis of transferrin and its role in iron uptake by cultured chick presumptive myoblasts (dividing and non‐dividing) and myotubes. The effects of a variety of inhibitors on the internalization of transferrin and iron were investigated and three main effects were found: (i) sulphydryl reagents and microtubular inhibitors reduced the rate of transferrin and iron internalization to similar degrees, (ii) metabolic inhibitors reduced the rate of iron uptake more than that of transferrin endocytosis, and (iii) lysosomotrophic agents almost completely abolished iron accumulation by the cells without any effect on the rate of transferrin internalization. The results suggest that metabolic energy is required not only for the endocytosis of transferrin but also for subsequent steps in the iron uptake process, and that iron release from transferrin occurs in acidified endosomes. Overall, these experiments show that all or virtually all of the iron taken up by developing muscle cells from transferrin occurs as a consequence of receptor‐mediated endocytosis of the protein.

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