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Membrane cholesterol and tumor bioenergetics.

P S Coleman

    Annals of the New York Academy of Sciences
    |January 1, 1986
    PubMed
    Summary

    Tumor cells preferentially export citrate for cholesterol synthesis. Inhibiting this export with 1,2,3-benzenetricarboxylate (BTC) blocks cholesterol production, revealing a key metabolic vulnerability in cancer.

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    Area of Science:

    • Biochemistry
    • Cancer Metabolism
    • Mitochondrial Function

    Background:

    • Tumors exhibit deregulated cholesterol synthesis (cholesterogenesis).
    • Mitochondrial citrate export is linked to cancer cell metabolism.

    Purpose of the Study:

    • To investigate the role of mitochondrial citrate export in tumor cholesterogenesis.
    • To evaluate the effect of 1,2,3-benzenetricarboxylate (BTC) on tumor citrate metabolism.

    Main Methods:

    • Utilized isolated mitochondria and viable tumor tissue slices.
    • Measured [14C]pyruvate incorporation into cholesterol.
    • Assessed the impact of BTC on citrate efflux and CO2 production.

    Main Results:

    • Tumor mitochondria preferentially export pyruvate-generated citrate.
    • 1,2,3-benzenetricarboxylate (BTC) inhibits tumor mitochondrial citrate export.
    • BTC treatment significantly reduces [14C]pyruvate incorporation into cholesterol in tumor tissues.

    Conclusions:

    • Tumor citrate export is crucial for high rates of cholesterogenesis.
    • BTC effectively blocks tumor citrate export, impacting cholesterol synthesis.
    • Targeting the tricarboxylate carrier offers a potential strategy against tumor growth.

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