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Adrenal cholesterol esters as substrate source for steroidogenesis.

C L Bisgaier, R Chanderbhan, R W Hinds

    Journal of Steroid Biochemistry
    |December 1, 1985
    PubMed
    Summary

    Adrenocortical cells use stored cholesterol esters for steroidogenesis, even when stimulated by ACTH. This finding reveals a key pathway for corticosterone production in rats, impacting adrenal research.

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    Area of Science:

    • Endocrinology
    • Cell Biology
    • Biochemistry

    Background:

    • Adrenocortical cells synthesize steroid hormones, primarily corticosterone in rats.
    • Cholesterol is the essential precursor for steroidogenesis.
    • The intracellular sources of cholesterol for steroidogenesis are not fully elucidated.

    Purpose of the Study:

    • To investigate the primary source of cholesterol used for steroidogenesis in rat adrenocortical cells.
    • To determine the role of stored cholesterol esters in response to ACTH stimulation.

    Main Methods:

    • Rat adrenocortical cells were incubated with labeled cholesterol precursors ([4-14C]cholesterol, [2-14C]acetate, or lipoprotein [4-14C]cholesterol oleate).
    • Cells were stimulated with ACTH (adrenocorticotropic hormone) or left unstimulated.

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  • Specific radioactivity (SA) of secreted corticosterone was measured to trace cholesterol substrate origin.

    • Main Results:

    • ACTH stimulation increased corticosterone mass but not the radioactivity from labeled cholesterol or acetate.
    • The specific radioactivity of corticosterone was significantly diluted in the presence of ACTH, regardless of the cholesterol source.
    • Lipoprotein cholesterol oleate uptake and hydrolysis were independent of ACTH, but corticosterone SA was still diluted with ACTH.

    Conclusions:

    • Stored cytoplasmic cholesterol esters are likely the primary source of cholesterol for steroidogenesis in rat adrenocortical cells.
    • ACTH stimulation preferentially utilizes endogenous cholesterol ester stores over newly acquired cholesterol.
    • This highlights the importance of intracellular cholesterol ester pools in regulating steroid hormone production.