Differences in transferrin receptor function between normal developing and transformed myogenic cells as revealed by differential effects of phorbol ester on receptor distribution and rates of iron uptake

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

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Abstract

The effects of the tumor promoter, 4β-phorbol 12β-myristate 13α-acetate (PMA), on the intra- and extracellular distribution of transferrin receptors and rates of iron uptake were studied in normal developing myogenic cells and myogenic cells transformed with a temperature-sensitive strain of the Rous sarcoma virus. In normal developing cells PMA was found to increase the rate of iron uptake by 15-30%. There was, however, no effect on transferrin receptor distribution, suggesting that the increase in iron uptake was due to stimulation of the rate of receptor cycling. In contrast, in transformed myogenic cells, PMA had no effect even at concentrations 10 times those effective in normal myogenic cells. The specificity of PMA was demonstrated by comparison with 4α-phorbol which had no effect compared with the control cells which were incubated with dimethyl sulfoxide, the solvent used to dissolve the phorbols. These results indicate a functional difference in the transferrin receptor between normal and transformed myogenic cells. The data for normal myogenic cells are similar to those previously reported for normal erythroid cells, but differ from those for some transformed cell lines in which phorbol esters were shown to cause internalization of transferrin receptors.

Original languageEnglish
Pages (from-to)14128-14133
Number of pages6
JournalJournal of Biological Chemistry
Volume263
Issue number28
Publication statusPublished - 1 Jan 1988

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Transferrin Receptors
Phorbol Esters
Acetates
Iron
Phorbols
Dimethyl Sulfoxide
Viruses
Carcinogens
Cells
Rous sarcoma virus
Erythroid Cells
Transformed Cell Line
phorbol-12-myristate
phorbol ester receptor
Temperature

Cite this

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title = "Differences in transferrin receptor function between normal developing and transformed myogenic cells as revealed by differential effects of phorbol ester on receptor distribution and rates of iron uptake",
abstract = "The effects of the tumor promoter, 4β-phorbol 12β-myristate 13α-acetate (PMA), on the intra- and extracellular distribution of transferrin receptors and rates of iron uptake were studied in normal developing myogenic cells and myogenic cells transformed with a temperature-sensitive strain of the Rous sarcoma virus. In normal developing cells PMA was found to increase the rate of iron uptake by 15-30{\%}. There was, however, no effect on transferrin receptor distribution, suggesting that the increase in iron uptake was due to stimulation of the rate of receptor cycling. In contrast, in transformed myogenic cells, PMA had no effect even at concentrations 10 times those effective in normal myogenic cells. The specificity of PMA was demonstrated by comparison with 4α-phorbol which had no effect compared with the control cells which were incubated with dimethyl sulfoxide, the solvent used to dissolve the phorbols. These results indicate a functional difference in the transferrin receptor between normal and transformed myogenic cells. The data for normal myogenic cells are similar to those previously reported for normal erythroid cells, but differ from those for some transformed cell lines in which phorbol esters were shown to cause internalization of transferrin receptors.",
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AU - Morgan, E. H.

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AB - The effects of the tumor promoter, 4β-phorbol 12β-myristate 13α-acetate (PMA), on the intra- and extracellular distribution of transferrin receptors and rates of iron uptake were studied in normal developing myogenic cells and myogenic cells transformed with a temperature-sensitive strain of the Rous sarcoma virus. In normal developing cells PMA was found to increase the rate of iron uptake by 15-30%. There was, however, no effect on transferrin receptor distribution, suggesting that the increase in iron uptake was due to stimulation of the rate of receptor cycling. In contrast, in transformed myogenic cells, PMA had no effect even at concentrations 10 times those effective in normal myogenic cells. The specificity of PMA was demonstrated by comparison with 4α-phorbol which had no effect compared with the control cells which were incubated with dimethyl sulfoxide, the solvent used to dissolve the phorbols. These results indicate a functional difference in the transferrin receptor between normal and transformed myogenic cells. The data for normal myogenic cells are similar to those previously reported for normal erythroid cells, but differ from those for some transformed cell lines in which phorbol esters were shown to cause internalization of transferrin receptors.

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