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Mechanism of Decrease in Transferrin Receptor Synthesis by Interferon-α Treated Human Lymphoblastoid Cells
K Muta1, J Nishimura1, Y Abe1
1a Third Department of Internal Medicine, Faculty of Medicine, Kyushu University, Fukuoka, 812, Japan.
Insights
Interferon-alfa (IFN-α) reduces transferrin receptor biosynthesis in Daudi cells, an iron-independent process. This may contribute to IFN-α's antiproliferative effects in hematological malignancies.
Area of Science:
- Oncology
- Immunology
- Cell Biology
Background:
- Hematological malignancies involve uncontrolled cell proliferation.
- Interferon-alfa (IFN-α) exhibits antiproliferative effects in these cancers.
- The precise mechanism of IFN-α's action requires further elucidation.
Purpose of the Study:
- To investigate the effect of IFN-α on the transferrin receptor system in Daudi cells.
- To determine the role of iron metabolism in IFN-α-induced antiproliferation.
Main Methods:
- Daudi cells were treated with IFN-α (10(4)U/ml).
- Surface transferrin receptor levels were quantified.
- Transferrin receptor biosynthesis was assessed using (35)S-methionine labeling.
- Iron uptake and ferritin content were measured.
Main Results:
- IFN-α treatment decreased surface transferrin receptors by 40%.
- This reduction was independent of iron chelation.
- IFN-α significantly inhibited transferrin receptor biosynthesis.
- Iron uptake and ferritin levels were reduced by 50%.
Conclusions:
- IFN-α inhibits transferrin receptor biosynthesis in an iron-independent manner.
- The resulting cellular iron deficiency may mediate the antiproliferative action of IFN-α.
- These findings offer insights into IFN-α's therapeutic mechanism in hematological cancers.
Abstract:
To clarify the mechanism of antiproliferative action of interferon-α (IFN-α) in hematological malignancy, we examined the transferrin receptor system in the lymphoblastoid cell line, Daudi cells treated with IFN-α. When cells were cultured with 10(4)U/ml of IFN-α, the number of surface transferrin receptors was decreased to 60% of that seen in the control culture. This decrease was not neutralized by co-incubation with the iron chelator, desferrioxamine (10-200 μM), suggesting that the change in the level of chelatable iron did not account for the decrease in transferrin receptor numbers. When determined by metabolic labeling using (35)S-methionine, IFN-α markedly decreased the rate of transferrin receptor biosynthesis. Uptake of iron and the cellular ferritin content also decreased by 50% when incubated with 10(4)U/ml of IFN-α. These data indicate that IFN-α inhibits transferrin receptor biosynthesis in an iron-independent fashion and the subsequent cellular iron-deficiency state may play a role in the antiproliferative action of IFN-α.
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