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Related Experiment Videos

Intracellular modifications of human apolipoprotein E.

V I Zannis, J vanderSpek, D Silverman

    The Journal of Biological Chemistry
    |October 15, 1986
    PubMed
    Summary

    Human apolipoprotein E (apoE) undergoes intracellular modification into three major sialylated isoproteins. These modified apoE forms are then secreted by HepG2 cells and macrophages.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Molecular Biology

    Background:

    • Apolipoprotein E (apoE) plays a crucial role in lipid metabolism and transport.
    • Understanding the post-translational modifications and secretion pathways of apoE is essential for elucidating its function.

    Purpose of the Study:

    • To investigate the synthesis, intracellular modification, and secretion of human apolipoprotein E (apoE).
    • To identify the specific forms of apoE that are secreted and the mechanisms regulating these processes.

    Main Methods:

    • Pulse-chase experiments were conducted using HepG2 cells and human monocyte-derived macrophages.
    • Cells were treated with tunicamycin and monensin to assess their effects on apoE sialylation and secretion.

    Main Results:

    • Modified apoE isoproteins were detected intracellularly within 14 minutes and increased over a 2-hour period.
    • Three major sialylated apoE isoproteins (apoEs2, apoEs4, apoEs6) were identified intracellularly and in secreted fractions.
    • ApoE secretion was observed after 30 minutes, with secreted apoE predominantly consisting of the same sialylated forms.
    • Tunicamycin did not affect apoE sialylation or secretion, while monensin inhibited both processes.

    Conclusions:

    • Human apolipoprotein E is secreted as three major isoproteins.
    • These isoproteins are generated through intracellular modification involving O-linked oligosaccharide chains containing sialic acid.
    • The findings suggest a specific pathway for apoE modification and secretion in HepG2 cells and macrophages.

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