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Related Experiment Videos

Control of ovarian cholesterol ester biosynthesis.

A P Flint, D L Grinwich, D T Armstrong

    The Biochemical Journal
    |February 1, 1973
    PubMed
    Summary

    Progesterone and 20alpha-hydroxypregn-4-en-3-one inhibit ovarian cholesterol ester synthetase, acutely depleting ovarian cholesterol ester after trophic stimulation. Cyclic AMP mimics this effect by increasing these steroid concentrations.

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    Animal genetics·2006

    Area of Science:

    • Steroid biochemistry
    • Reproductive endocrinology
    • Cellular signaling

    Background:

    • Ovarian cholesterol ester stores are rapidly depleted following trophic stimulation.
    • The precise mechanisms regulating this acute depletion remain incompletely understood.

    Purpose of the Study:

    • To investigate the role of progesterone and 20alpha-hydroxypregn-4-en-3-one in the acute regulation of ovarian cholesterol ester metabolism.
    • To elucidate the involvement of cyclic AMP (adenosine 3':5'-cyclic monophosphate) in this process.

    Main Methods:

    • Incubation of rabbit ovarian interstitial tissue slices with radiolabeled oleate.
    • Measurement of cholesterol esterification rates.
    • Analysis of enzyme activity in cell-free extracts.
    • Quantification of intracellular steroid concentrations.
    • In vivo studies in rats.

    Main Results:

    • Luteinizing hormone and cyclic AMP significantly decreased cholesterol esterification rates in ovarian slices.
    • Cyclic AMP increased intracellular progesterone and 20alpha-hydroxypregn-4-en-3-one concentrations.
    • Progesterone and 20alpha-hydroxypregn-4-en-3-one directly inhibited cholesterol ester synthetase activity in vitro.
    • Cycloheximide and aminoglutethimide phosphate blocked hormone-induced cholesterol ester depletion in vivo.

    Conclusions:

    • Progesterone and 20alpha-hydroxypregn-4-en-3-one act as key inhibitors of cholesterol ester synthetase, mediating the acute depletion of ovarian cholesterol ester.
    • Cyclic AMP-dependent signaling pathways regulate these inhibitory steroid concentrations, influencing ovarian cholesterol homeostasis.

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