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Related Experiment Videos

Phorbol ester-induced surface transferrin receptor modulation. No correlation with decreased cell proliferation.

L M Neckers, C Vidal, R McGlennen

    Experimental Cell Research
    |September 1, 1986
    PubMed
    Summary

    Phorbol ester and diacylglycerol (DAG) decrease cell surface transferrin receptors (TFR) in leukemia cells. Calcium channel blockers prevent TFR internalization but not phosphorylation, dissociating TPA effects.

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    Area of Science:

    • Cell biology
    • Molecular signaling
    • Cancer research

    Background:

    • The transferrin receptor (TFR) plays a crucial role in cellular iron uptake.
    • Phorbol esters and diacylglycerol (DAG) are known modulators of cellular processes, including receptor trafficking.
    • Leukemia cell lines like CEM and HL-60 are valuable models for studying T-cell and myeloid malignancies.

    Purpose of the Study:

    • To investigate the effects of phorbol ester and DAG on cell surface TFR expression in human leukemia cell lines.
    • To elucidate the role of calcium signaling and calcium channel blockers in TFR regulation.
    • To determine the relationship between TFR redistribution, phosphorylation, and cell proliferation.

    Main Methods:

    • Treatment of CEM and HL-60 cells with phorbol ester, DAG, and phospholipase C.

    Related Experiment Videos

  • Quantification of cell surface TFR number using flow cytometry or radioligand binding assays.
  • Assessment of cell proliferation via [3H]thymidine incorporation.
  • Investigation of calcium dependency using EGTA and calcium channel blockers like diltiazem.

    • Main Results:

    • Phorbol ester and DAG significantly reduced cell surface TFR number in both cell lines with a half-life of approximately 30 minutes.
    • This reduction was mimicked by phospholipase C, suggesting DAG involvement.
    • TFR levels decreased to 25-30% of control after 5 hours, without affecting cell proliferation.
    • The TFR reduction was independent of extracellular calcium but completely blocked by diltiazem.
    • Diltiazem prevented TFR redistribution but not the phorbol ester-induced increase in TFR phosphorylation.

    Conclusions:

    • Calcium channel blockade dissociates tetradecanoylphorbol acetate (TPA)-induced TFR internalization from TFR phosphorylation.
    • Endogenous DAG, produced by phospholipase C, effectively mimics phorbol ester-induced TFR modulation.
    • TFR redistribution induced by phorbol esters or DAG is not associated with a decrease in cellular proliferation capacity.