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Related Experiment Videos

Nuclear glycogen synthase--fact or artifact?

M Kopun, H Spring, C Granzow

    FEBS Letters
    |October 18, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Nuclear glycogen synthase is not an artifact. Research shows this enzyme is genuinely present in the nuclei of in vivo growing tumor cells, not just in the cytoplasm.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Molecular Biology

    Background:

    • Previous studies suggested nuclear glycogen synthase was a preparation artifact in rat liver nuclei.
    • Glycogen deposition and its associated enzymes are crucial in cellular metabolism and energy storage.

    Purpose of the Study:

    • To investigate the true localization and presence of glycogen synthase in isolated nuclei.
    • To differentiate between cytoplasmic and nuclear glycogen synthase activity in HD33 ascites cells.

    Main Methods:

    • Isolation of nuclei from in vitro and in vivo growing HD33 ascites cells.
    • Biochemical assays to measure glycogen synthase activity.
    • Ultracytochemical analysis to detect glycogen particles and enzyme localization.

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    Main Results:

    • Isolated nuclei from in vitro cells showed exclusively cytoplasmic glycogen.
    • Isolated nuclei from in vivo tumor cells exhibited intranuclear glycogen deposition.
    • Biochemical and ultracytochemical analyses confirmed no cytoplasmic contamination in isolated nuclei.
    • Glycogen synthase activity was confirmed to reside within the nuclei of in vivo growing tumor cells.

    Conclusions:

    • Glycogen synthase is a genuinely nuclear enzyme in vivo growing HD33 ascites tumor cells.
    • The nuclear presence of glycogen synthase is not an artifact of nuclear isolation.
    • This finding challenges previous assumptions about glycogen metabolism localization.